How to identify rail0 or ral1 in RAL transaction

Following is the solution that can identify whether current RAL access is from rail0 or rail1 automatically.

1) In svidRegFile, use 12 bits for block based address, among them lower 8 bits are “actual ” register base address, while higher 4 bits are used for SVID VR address, for example , if it is rail0, the higher 4 bits would be “4’b0000”, if rail1: 4’b0001, if rail2: 4’b0010,…..

system svidRegSys {
bytes 64;

block svidRail0=svidReg0 @'h000;
block svidRail1=svidReg1 @'h100;

}

2) In svidXactor, divide the 12 bits address into SVID VR address + register actual address as following:

task svidXactor::prepare_ralrd_trans(input svidRALTrans ral_trans);
svid_trans.address=ral_trans.addr[11:8];//VR address
svid_trans.cmd=5'h07;//GETREG;
svid_trans.payload=ral_trans.addr[7:0];//register address
…
endtask

task svidXactor::prepare_ralwr_trans(input svidRALTrans ral_trans);

//phase0: send SETREGADR command
svid_trans.address=ral_trans.addr[11:8];//VR address
svid_trans.cmd=5'h05;//SETREGADR;
svid_trans.payload=ral_trans.addr[7:0];//register address
…

///phase1:send SETREGDAT command
svid_trans.address=ral_trans.addr[11:8];//VR address
svid_trans.cmd=5'h06;//SETREGDAT;
svid_trans.payload=ral_trans.data;//register data

endtask