跟我学VMM testbech (5)---实战 MP2991

这里继续讨论xactor。今天我们讨论的是介于中间层次的transactor（称为XformXactor），这个xactor主要接受来自上层的transaction（包括generator, RAL read write xactor）。经过一些处理和判断（retry，插入额外指令，进行error injection。。。）最终送往BFM.

//在transactor中定义一个空的callback类 //下一步的收集transaction的coverage的callback扩展类，就是基于这个类 class svidCallbacks extends vmm_xactor_callbacks; virtual task pre_send(svidTrans audio_trans); endtask virtual task post_send(svidTrans audio_trans); endtask endclass class svidXactor extends vmm_xactor; // 模块内用modport作为成员 virtual svidIntf.md_svid svid_intf; virtual svidIntf.md_mon mon_intf; svidSYSCfg sys_cfg; // reserve for coding style svidREGCfg reg_cfg; // reserve for coding style svidRALTrans ral_trans; // ral transaction svidTrans svid_trans; // gen transaction svidRALTrans_channel ral_chan; // input ral chan svidTrans_channel svid_chan; // input chan svidTrans_channel bfm_chan; // output chan to bfm svidTrans_channel mon_chan; // output chan to monitor //RAL : since BFM needs to do some self check which may // use some status register, so bring in the ral_model handler ral_sys_svidRegSys ral_sys; // ral model vmm_rw::status_e stat; bit[7:0] rdata; bit[7:0] wdata; bit clock_stop_beack_n=0; extern function new( svidSYSCfg sys_cfg, svidREGCfg reg_cfg, ral_sys_svidRegSys ral_sys, virtual svidIntf svidintf, // 用interface 初始化 modport svidRALTrans_channel ral_chan = null, svidTrans_channel svid_chan = null, svidTrans_channel bfm_chan = null, svidTrans_c