Data Multiplexing

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本文详细介绍了数据倍增技术的工作原理、配置方法、数据大小确定、影响数据恢复操作的因素以及最佳实践。通过分析网络配置和需求来确定倍增因子，实现多个客户端的数据并行备份到同一介质，提高数据保护效率和资源利用率。

Configuration > Storage Policy Copies > Data Multiplexing

Published 11/19/2010 02:53 PM   |    Updated 11/19/2010 02:53 PM

Data Multiplexing

Topics | How To | Related Topics

Overview

How Data Multiplexing Works

Configure for Data Multiplexing

Determining the Multiplexing Factor

Perform. a Multiplexed Data Protection Operation

Impact of Data Multiplexing on Data Recovery Operations

Best Practices

License Requirement

Support Information - Storage Policy Copy

Overview

In a typical storage policy configuration, many clients/subclients can point to the same storage policy. Each storage policy copy has one or more streams related to the number of drives in a drive pool. On a particular stream, only one subclient can perform. a data protection operation at any one time. The limit for the number of data protection operations that can go to any one stream is one. Therefore, only one data protection operation can be sent to a media/drive at any one time.

This limitation has its disadvantages. Backing up one client/subclient to a single piece of media does not fully utilize the drive's throughput, as the backing up of client data can be much slower than actual speeds of the tape.

In a large enterprise with many clients, many data protection operations may need to be performed within a fixed backup window. This may lead to high hardware requirement costs if the drive or media used for those data protection operations is being under utilized.

To optimally use the high speed tape drives available today, data from several clients/subclients can be multiplexed and written to media.

Chunk Size of Data That is Multiplexed

Multiplexed data chunk sizes are determined by the type of data that is being multiplexed; file system data and database data.

  • If the first backup is a file system type backup, all other backups joining multiplexing will have a chunk size of 4 GB.
  • If the first backup is a database type backup, all other backups joining multiplexing will have a chunk size of 16 GB.

Multiplexed data is aged when all jobs (multiplexed) on a single chunk have met the defined retention rules of their associated storage policy copy. For more information, see Data Aging.

  • Data in a storage policy copy enabled for Deduplication can not be multiplexed. Therefore, Data Multiplexing is not supported if the storage policy copy is enabled with Deduplication. However, a SILO copy supports Data Multiplexing even if the storage policy copy is enabled with Deduplication.
  • Multiplexed data cannot be copied to a storage policy copy enabled for Deduplication. Therefore, a storage policy copy enabled for Deduplication can not have a direct or indirect source copy enabled for Data Multiplexing.
  • An Auxiliary Copy can be configured with Data Multiplexing when the source copy is enabled for Deduplication.

How Data Multiplexing Works

During a data protection operation, agent data is transferred to media over a data pipeline. This data is transferred by data movers that read agent data then write the data to the media.

During data multiplexing, many such data movers must read and write data to the same piece of media. To achieve this, these data movers are comprised of two components, data receivers and data writers. During data multiplexing, one data receiver per backup stream reads the data coming through the data pipeline. One data writer per media receives data from multiple data receivers then writes data to the media.

In the sample image that follows, Subclient_A and Subclient_B are being backed up at the same time and their data is being multiplexed. Multiple data receivers read the data and then one data writer writes the data to a single piece of media.

data_multplexing.gif

Configuring for Data Multiplexing

To configure your subclients to use this feature, data multiplexing must be enabled from the Media tab of the Copy Properties dialog box of the primary copy.

For example, if three subclients of this storage policy are to be backed up in a multiplexed manner, then the multiplexing factor would be set to three.

data_multiplexing_factor.gif

Determining the Multiplexing Factor

The multiplexing factor should be determined by analyzing your network configuration and by examining your needs for maximizing disk throughput to decrease the total amount of time it takes to protect your data. The multiplexing factor is determined by the following:

  • Network card speed
  • Network switch speed
  • Drive speed

The following examples will help you determine the multiplexing factor. Keep in mind that these are only hypothetical examples.

  1. Let's analyze a network configuration that involves three clients, without and with multiplexing.
  2. What happens when a fourth client is added to the example and the multiplexing factor is set to four.
  3. A fifth client is added, and the multiplexing factor is set to five, is this over-multiplexing?
  4. If you have over-multiplexed, either set the multiplexing factor lower and multiplex less clients, or add some gigabit Ethernet switches to your network.
  5. In another example, client disk speeds are fast and they become slower after multiplexing.

Note that the maximum multiplexing factor that can be set from the CommCell Console is 10 and the system displays a warning message when the multiplexing factor is set to 5 or above.

Perform. a Multiplexed Data Protection Operation

Once the multiplexing factor is set on the primary copy of the storage policy whose subclients are to be backed up, all data protection operations of the storage policy can run at the same time, to the same piece of media.

In the sample image that follows, Job IDs 142, 140, and 141 are all backing up to Lib_Drive1.

data_muliplexing_running.gif

Perform. Data Multiplexing Using a Magnetic Library

Data Multiplexing can be performed on a magnetic library by setting the maximum number of streams on the magnetic storage policy to a value equal to the number of data protection operations that are to be performed simultaneously. For more information on setting the number of data streams, see Storage Policy Copy Properties.

De-Multiplexing Multiplexed Data

De-multiplexing segregates/de-multiplexes the data for selected clients/subclients from the larger list of clients. The software does not require de-multiplexing; however, if you want to de-multiplex the data that you have multiplexed, you can create a subclient-based storage policy copy for each subclient within the original storage policy copy, and then perform. an auxiliary copy operation on that copy.

Be sure to adhere to Best Practices when using the data multiplexing feature.

Multiplexing and Data Streams

Data Multiplexing is performed differently based on whether or not you are performing multiple stream data protection operations.

Data Multiplexing With Single Stream Data Protection Operations

In the following example, J1, J2, J3,and J4 have been run as single stream data protection operations. There are two drives available, D1, and D2.

If there is no data multiplexing:

J1 will use D1, J2 will use D2. J3,and J4 will go into a waiting state until J1 and J2 have completed.

If data multiplexing was used with a multiplexing factor of two:

J1 and J2 will use D1. J3 and J4 will use D2.

Data Multiplexing With Multiple Stream Data Protection Operations

The following examples illustrate data multiplexing with data protection operations that use multiple streams.

Data Multiplexing with File System Multiple Stream Data Protection Operations

In the following example, there are two jobs, J1 and J2. Each job was run with three streams. There are two drives, D1 and D2.

If there is no data multiplexing:

J1 has three streams, and each stream uses D1, but they run one after another.

J2 also has three streams, and each stream uses D2, and they also run one after another.

If there is data multiplexing with a multiplexing factor of three:

The three streams of J1 can run concurrently to D1.

The three streams of J2 can run concurrently to D2.

Data Multiplexing with Database Multi Streaming

In the following example, a three stream database data protection operation is performed with a multiplexing factor of three. J1, J2, and J3 are database data protection operations, and each used three streams. There are three drives available, D1, D2, and D3.

If there is no data multiplexing:

D1 - J1

D2 - J1

D3 - J1

The second and third job (J2 and J3) must wait for the necessary resources.

If there is data multiplexing with a multiplexing factor of three.

The first job (J1) uses three drives, D1, D2, and D3:

D1 - J1

D2 - J1

D3 - J1

The second and third job (J2 and J3) are multiplexed and use the same drives as J1:

D1 - J1, J2, J3

D2 - J1, J2, J3

D3 - J1, J2, J3

Therefore, J1, J2, and J3 use D1, D2, and D3 in parallel.

Impact of Data Multiplexing on Data Recovery Operations

The following data recovery operations can be performed on multiplexed data without significant degradation of performance:

  • Data recovery operations using CommCell Console

  • Data recovery operations using Media Explorer

Data Multiplexing with Multi Streaming for Oracle Jobs

The Oracle iDataAgent applies multiplexing rule as any other database iDataAgenta for multiple jobs. Also, when you have multiplexing enabled for an Oracle job with multiple streams, all the streams of the job can be made to use the available drives sequentially (i.e., fills one drive and then moves to the next) by setting the JMEnableMultiplexingForOracleAgents parameter in the CommServe database as follows:

Insert into GXGlobalParam values ('JMEnableMultiplexingForOracleAgents','1')

However, note that this parameter can be used only for Oracle jobs from the CommCell Console or when initiating the job using qoperation backup command. In the case of on demand Oracle jobs, data multiplexing is enabled by default. You can disable this feature using the QB_NO_MULTIPLEX_STREAM option.

Best Practices

It is recommended that you keep the following in mind when performing data multiplexing:

  • Use different storage policies for file system and database type data before performing data multiplexing. Therefore, there will not be differences in the chunk sizes of the different types of data.

  • If possible use the Restore by Jobs option to restore multiplexed data, especially when restoring large amount of data. This will provide the optimum performance during the restore operation as there are fewer tape rewinds to secure the data.
  • It is recommended that you perform. data multiplexing for jobs that have similar speeds (i.e. two database jobs), instead of mixing faster jobs (i.e. file systems) with slower jobs (i.e. databases). Mixing faster and slower jobs results in data stored on media that is not uniform.. Hence, data recovery operations of slower clients will have added performance penalty.
  • Multiplexing is recommended if you are planning to recover:
    • Individual items, files and folders.
    • Entire computers or databases.
  • It is not recommended under following conditions:
    • If you are planning to recover scattered folders as multiplexing will further scatter the data. Also it adds to up to extra tape mounts and rewinding/forwarding on the media.
    • Clients which undergo very frequent restore requests.
  • The multiplexing factor is determined based on the ratio of how fast the tape drive is compared to the disk. For example, consider the following ratios:
    • Tape write speed = 80 GB per hour
    • Disk read speed (backup) = 25 GB per hour
    • Tape read speed = 80 GB per hour
    • Disk write speed (restore) = 60 GB per hour

    Tape write speed/disk read speed (backup) = 80/25 = 3.2 GB per hour

    Tape read speed/disk write speed (restore) = 80/60 = 1.33 GB per hour

    It is recommended that the lower of the two ratios as the multiplexing factor if you want no-penalty data recovery operations.

License Requirement

This feature requires a Feature License to be available in the CommServe® Server.

Review general license requirements included in License Administration. Also, View All Licenses provides step-by-step instructions on how to view the license information.

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转载于:http://blog.itpub.net/611609/viewspace-697328/

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“ “//-------------------------------------------------------------------------------- // Signal Assignment: Input Data Multiplexing //-------------------------------------------------------------------------------- // Primary input data: MISO for Master, MOSI for Slave assign data_in = (spi_enabled === 1'b1) ? ((master_reg === 1'b1) ? spipm_in_miso : spipm_in_mosi) : 1'b1; // 4-line mode input assignments (multiplex based on line width) assign data_in_0 = (spi_enabled === 1'b1) ? （ (((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01))) ? spipm_in_mosi : 1'bz ） : 1'b1; assign data_in_1 = (spi_enabled === 1'b1) ? （ (((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01))) ? spipm_in_miso : 1'bz ） : 1'b1; assign data_in_2 = (spi_enabled === 1'b1) ? (((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) ? spipm_in_data2 : 1'bz) : 1'b1; assign data_in_3 = (spi_enabled === 1'b1) ? (((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) ? spipm_in_data3 : 1'bz) : 1'b1; //-------------------------------------------------------------------------------- // Clock Generation & Polarity/Phase Adjustment //-------------------------------------------------------------------------------- // Select SPI clock source: Master uses generated clock, Slave uses input clock (adjusted for polarity) assign spi_clock = (spi_enabled === 1'b1) ? (master_reg === 1'b1) ? spi_clock_reg : (spipm_in_spsclk ^ cpol_reg) : cpol_reg; // Derive sampling and shifting clocks from SPI clock (adjusted for phase) assign spi_sample_clk = spi_clock ^ cpha_reg; // Clock edge for data sampling assign spi_shift_clk = spi_clock ^ (~cpha_reg); // Clock edge for data shifting // Slave Select (SS) signal (masked in I2S mode) assign slave_sel_b = (spi_enabled === 1'b1) ? ((master_reg === 1'b1) ? (slave_sel_b_reg & ~i2s_mode_reg) : (spipm_in_ss_b & ~i2s_mode_reg)) : 1'b1; //-------------------------------------------------------------------------------- // Output Data Multiplexing (1-line, 2-line, 4-line modes) //-------------------------------------------------------------------------------- // Primary output data (from TX shifter, adjusted for LSB/MSB first) assign data_out = ((spi_enabled == 1'b1) && (~single_wire_reg || bidiroe_reg)) ? tx_shifter[lsbfe_reg ? bit_cnt : (spi_data_width - 1 - bit_cnt)] : 1'bz; // 4-line output data: data_out_0 (multiplex based on mode) always_comb begin if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode if (lsbfe_reg) data_out_0 = tx_shifter[bit_cnt + 3]; else data_out_0 = tx_shifter[spi_data_width - 1 - (bit_cnt + 3)]; end else if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b0) && (width_reg == 2'b01)) begin // 2-line mode if (lsbfe_reg) data_out_0 = tx_shifter[bit_cnt + 1]; else data_out_0 = tx_shifter[spi_data_width - 1 - (bit_cnt + 1)]; end else begin // 1-line mode or disabled: high-impedance data_out_0 = 1'bz; end end // 4-line output data: data_out_1 (multiplex based on mode) always_comb begin if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode if (lsbfe_reg) data_out_1 = tx_shifter[bit_cnt + 2]; else data_out_1 = tx_shifter[spi_data_width - 1 - (bit_cnt + 2)]; end else if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b0) && (width_reg == 2'b01)) begin // 2-line mode if (lsbfe_reg) data_out_1 = tx_shifter[bit_cnt]; else data_out_1 = tx_shifter[spi_data_width - 1 - bit_cnt]; end else begin // 1-line mode or disabled: high-impedance data_out_1 = 1'bz; end end // 4-line output data: data_out_2 (only active in 4-line mode) always_comb begin if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode if (lsbfe_reg) data_out_2 = tx_shifter[bit_cnt + 1]; else data_out_2 = tx_shifter[spi_data_width - 1 - (bit_cnt + 1)]; end else begin // Not 4-line mode: high-impedance data_out_2 = 1'bz; end end // 4-line output data: data_out_3 (only active in 4-line mode) always_comb begin if ((spi_enabled == 1'b1) && (pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode if (lsbfe_reg) data_out_3 = tx_shifter[bit_cnt]; else data_out_3 = tx_shifter[spi_data_width - 1 - bit_cnt]; end else begin // Not 4-line mode: high-impedance data_out_3 = 1'bz; end end //-------------------------------------------------------------------------------- // Protocol Output Signals (Final Multiplexing to Pins) //-------------------------------------------------------------------------------- // SPI clock output (Master mode only, adjusted for polarity) assign spipm_out_spsclk = (master_reg && spi_enabled) ? spi_clock_reg ^ cpol_reg : 1'bz; // Slave Select (SS) output logic (Master mode: auto/manual control) always_comb begin if (spi_manpcsen) begin // Manual control: SS is undefined spipm_out_ss_b = 1'bx; end else if (master_reg && spi_enabled) begin // Master mode: auto control if (spi_autopcs_reg) begin // Auto-assert: SS remains active per polarity spipm_out_ss_b = i2s_pcspol_reg ? 1'b1 : 1'b0; // Fixed active state end else if (i2s_pcspol_reg == 1'b0) begin // Polarity 0: SS active low spipm_out_ss_b = slave_sel_b_reg; end else begin // Polarity 1: SS active high (inverted) spipm_out_ss_b = ~slave_sel_b_reg; end end else begin // Slave mode: SS is high-impedance spipm_out_ss_b = 1'bz; end end // MOSI output (multiplex between 1-line data_out and 4-line data_out_0) assign spipm_out_mosi = (~(((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01)))) ? ((master_reg ^ single_wire_reg) ? data_out : 1'bz) : data_out_0; // MISO output (multiplex between 1-line data_out and 4-line data_out_1) assign spipm_out_miso = (~(((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01)))) ? (~(master_reg ^ single_wire_reg) ? data_out : 1'bz) : data_out_1; // 4-line data2/data3 outputs (only active in 4-line mode) assign spipm_out_data2 = ((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) ? data_out_2 : 1'bz; assign spipm_out_data3 = ((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) ? data_out_3 : 1'bz; //-------------------------------------------------------------------------------- // I2S Mode Logic //-------------------------------------------------------------------------------- // I2S WS signal: Master generates WS, Slave uses input SS assign i2s_ws = (master_reg && spi_enabled) ? slave_sel_b_reg : spipm_in_ss_b; // I2S WS edge pulse: triggered on WS transition (0->1 or 1->0) assign i2s_wsp = i2s_ws_dly[1] ^ i2s_ws_dly[0]; // I2S WS delay line (for edge detection) always @(posedge spi_sample_clk) begin if (spi_enabled && i2s_mode_reg == 1'b1) // Only active in I2S mode i2s_ws_dly <= {i2s_ws_dly[0], i2s_ws}; // Shift register to delay WS by 1 clock end //-------------------------------------------------------------------------------- // TX/RX Control: Reset & Initialization //-------------------------------------------------------------------------------- // Reset auxiliary process for CPHA = 0 (initializes TX on SS assertion) always @(slave_sel_b or spi_pop_data_ev) begin if (spi_enabled == 1'b1) begin if ((cpha_reg == 1'b0) && (slave_sel_b == 1'b0)) begin // CPHA=0 and SS active: start TX spipm_busy = 1'b1; tx_shifter = tx_buffer; spipm_tx_buffer_full = 1'b0; -> spipm_tx_buffer_empty_ev; end else if (slave_sel_b == 1'b1) begin // SS inactive: end transaction spipm_busy = 1'b0; end bit_cnt = 0; // Reset bit counter on reset events end end // Detect first shift clock edge (for CPHA=1 synchronization) always @(posedge spi_shift_clk or posedge slave_sel_b) begin if (spi_enabled == 1'b1) begin if (~i2s_mode_reg && slave_sel_b == 1'b0) // SPI mode and SS active: first edge see_first_shift_clk_reg <= 1'b1; else if (~i2s_mode_reg) // SPI mode and SS inactive: no edge see_first_shift_clk_reg <= 1'b0; else if (i2s_wsp) // I2S mode and WS edge: first edge see_first_shift_clk_reg <= 1'b1; end end //-------------------------------------------------------------------------------- // TX Process: Shifts Data Out (supports 1/2/4-line modes) //-------------------------------------------------------------------------------- always @(posedge spi_shift_clk or posedge slave_sel_b) begin if (spi_enabled == 1'b1) begin if (slave_sel_b == 1'b0) begin // SS active: transaction in progress // Initialize TX for CPHA=1 (load buffer on first shift) if ((bit_cnt == 0) && (cpha_reg == 1'b1) && (see_first_shift_clk_reg != 1'b1)) begin spipm_busy = 1'b1; tx_shifter = tx_buffer; spipm_tx_buffer_full = 1'b0; -> spipm_tx_buffer_empty_ev; end // Handle bit counting based on mode (I2S, 1-line, 2-line, 4-line) if (i2s_mode_reg) begin // I2S mode: count per WS edge if (i2s_wsp) begin bit_cnt = 0; -> spi_pop_data_ev; end else begin bit_cnt = bit_cnt + 1; end end else if (~(((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01))) && ((bit_cnt != (spi_data_width - 1)) && ((cpha_reg === 1'b0) || ((cpha_reg === 1'b1) && (see_first_shift_clk_reg === 1'b1))))) begin bit_cnt = bit_cnt + 1; // 1-line mode: increment by 1 end else if (((pcscfg_reg === 1'b0) && (width_reg === 2'b01)) && ((bit_cnt != (spi_data_width - 1)) && ((cpha_reg === 1'b0) || ((cpha_reg === 1'b1) && (see_first_shift_clk_reg === 1'b1))))) begin bit_cnt = bit_cnt + 2; // 2-line mode: increment by 2 end else if (((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) && ((bit_cnt != (spi_data_width - 4)) && ((cpha_reg === 1'b0) || ((cpha_reg === 1'b1) && (see_first_shift_clk_reg === 1'b1))))) begin bit_cnt = bit_cnt + 4; // 4-line mode: increment by 4 end else begin // End of transaction: reset counter bit_cnt = 0; -> spi_pop_data_ev; end end end end //-------------------------------------------------------------------------------- // RX Process: Samples Data In (supports 1/2/4-line modes) //-------------------------------------------------------------------------------- always @(posedge spi_sample_clk) begin if (spi_enabled == 1'b1) begin if (slave_sel_b == 1'b0) begin // SS active: sample data // Sample data based on line width mode if (~(((pcscfg_reg == 1'b1) && (width_reg == 2'b10)) || ((pcscfg_reg == 1'b0) && (width_reg == 2'b01)))) begin // 1-line mode rx_shifter[lsbfe_reg ? bit_cnt : (spi_data_width - 1 - bit_cnt)] = data_in; end else if ((pcscfg_reg == 1'b0) && (width_reg == 2'b01)) begin // 2-line mode rx_shifter[lsbfe_reg ? (bit_cnt) : (spi_data_width - 1 - (bit_cnt))] = data_in_1; rx_shifter[lsbfe_reg ? (bit_cnt + 1) : (spi_data_width - 1 - (bit_cnt + 1))] = data_in_0; end else if ((pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode rx_shifter[lsbfe_reg ? (bit_cnt) : (spi_data_width - 1 - (bit_cnt))] = data_in_3; rx_shifter[lsbfe_reg ? (bit_cnt + 1) : (spi_data_width - 1 - (bit_cnt + 1))] = data_in_2; rx_shifter[lsbfe_reg ? (bit_cnt + 2) : (spi_data_width - 1 - (bit_cnt + 2))] = data_in_1; rx_shifter[lsbfe_reg ? (bit_cnt + 3) : (spi_data_width - 1 - (bit_cnt + 3))] = data_in_0; end // Check for end of reception (trigger done events) if (~(((pcscfg_reg == 1'b1) && (width_reg == 2'b10)) || ((pcscfg_reg == 1'b0) && (width_reg == 2'b01)))) begin // 1-line mode if (bit_cnt == (spi_data_width - 1)) begin rx_buffer = rx_shifter; $display("DEBUG End of transfer, rx_buffer=%0h", rx_buffer); -> rx_done_ev; -> tx_done_ev; if (cpha_reg == 1'b1) spipm_busy = 1'b0; end end else if ((pcscfg_reg == 1'b0) && (width_reg == 2'b01)) begin // 2-line mode if (bit_cnt == (spi_data_width - 2)) begin rx_buffer = rx_shifter; $display("DEBUG End of transfer, rx_buffer=%0h", rx_buffer); -> rx_done_ev; -> tx_done_ev; if (cpha_reg == 1'b1) spipm_busy = 1'b0; end end else if ((pcscfg_reg == 1'b1) && (width_reg == 2'b10)) begin // 4-line mode if (bit_cnt == (spi_data_width - 4)) begin rx_buffer = rx_shifter; $display("DEBUG End of transfer, rx_buffer=%0h", rx_buffer); -> rx_done_ev; -> tx_done_ev; if (cpha_reg == 1'b1) spipm_busy = 1'b0; end end end end end //-------------------------------------------------------------------------------- // Master Mode Clock & SS Generation //-------------------------------------------------------------------------------- always @(posedge spipm_tx_buffer_full) begin if ((spi_enabled == 1'b1) && (master_reg == 1'b1)) begin // Master mode and enabled while (spipm_tx_buffer_full == 1'b1) begin // Transmit while TX buffer is full if (i2s_mode_reg) begin // I2S mode clock generation if (see_first_shift_clk_reg == 1'b0) begin // First frame: generate initial clocks repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end slave_sel_b_reg = ~slave_sel_b_reg; // Invert WS (word select) // Generate clock cycles for I2S data repeat (2 * spi_data_width) begin repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end // Send LSB if buffer is empty if (spipm_tx_buffer_full == 1'b0) begin repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end end else begin // Standard SPI mode spi_clock_reg = 1'b0; // Initialize clock slave_sel_b_reg = 1'b0; // Assert SS (active low) repeat (clk_div) @(posedge spipm_clock); // Wait for clock divider spi_clock_reg = cpha_reg; // Set initial clock based on phase // Generate clock cycles based on line width mode if (~(((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) || ((pcscfg_reg === 1'b0) && (width_reg === 2'b01)))) begin // 1-line mode repeat (2 * spi_data_width) begin repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end end else if ((pcscfg_reg === 1'b0) && (width_reg === 2'b01)) begin // 2-line mode repeat (spi_data_width) begin repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end end else if ((pcscfg_reg === 1'b1) && (width_reg === 2'b10)) begin // 4-line mode repeat (spi_data_width / 2) begin repeat (clk_div / 2) @(posedge spipm_clock); spi_clock_reg = ~spi_clock_reg; end end spi_clock_reg = 1'b0; // Reset clock repeat (clk_div * 5) @(posedge spipm_clock); // Post-transaction delay repeat (clk_div / 2) @(posedge spipm_clock); // Additional delay // Deassert SS (active low) if (cpha_reg == 1'b0 || cpha_reg == 1'b1) begin slave_sel_b_reg = 1'b1; // Deassert SS repeat (clk_div / 2) @(posedge spipm_clock); // Wait after deassert end end end end end ” 解析上述IC验证代码段，如果我想对上述验证代码段进行优化和重构，我需要分几步走，每一步都优化什么？给出一个详细的优化步骤。给出可实施的改善指导，形成一个完善的指导意见。
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