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test to write and read registers with field order like packing.low

mkyang

Hi,

Please, tell me how to test registers when the filed order of a register is packing.low, from a low bit position to a high bit position.

I applied the following code by referencing the document 'The Register and Memorr Model', but I could not get correct result.

extend MY_REG vr_ad_reg_file {

keep packing_mode == packing.low;

};

extend MAIN vr_ad_sequence {

!rgf_seq : ALL_REGS_IN_FILE vr_ad_sequence;

body() @driver.clock is {

...

do rgf_seq keeping {

.reg_file == MY_REG;

.order == ASCENDING;

.direction == WRITE

};

...

};

But, it seems not writing values correctly to registers.

  • StephenH

    This should work, but applies to an entire register file, not individual registers (looks like you knew that already, but I thought it was worth mentioning).

    It's impossible to know what's wrong from your description. Can you give more detail about the symptoms?
    You say that "[vr_ad is] not writing values correctly to the registers"; can you provide a concrete example please?

    1. What values do the individual fields show in the vr_ad_reg when it's generated by the sequence?

    2. What is the hex value of the bus data when vr_ad_execute_op() is called?
      Hint: set a break point on the vr_ad_execute_op() method in your bus eVC's hook-up file.

    3. Does the vr_ad hook-up to your bus eVC handle the data correctly?

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