UVM HDL Backdoor Access support routines.

These routines provide an interface to the DPI/PLI implementation of backdoor access used by registers.

If you DON’T want to use the DPI HDL API, then compile your SystemVerilog code with the vlog switch

vlog ... +define+UVM_HDL_NO_DPI ...

Summary

UVM HDL Backdoor Access support routines.
These routines provide an interface to the DPI/PLI implementation of backdoor access used by registers.
Variables
UVM_HDL_MAX_WIDTH	Sets the maximum size bit vector for backdoor access.
Methods
uvm_hdl_check_path	Checks that the given HDL path exists.
uvm_hdl_deposit	Sets the given HDL path to the specified value.
uvm_hdl_force	Forces the value on the given path.
uvm_hdl_force_time	Forces the value on the given path for the specified amount of force_time.
uvm_hdl_release_and_read	Releases a value previously set with uvm_hdl_force.
uvm_hdl_release	Releases a value previously set with uvm_hdl_force.
uvm_hdl_read()	Gets the value at the given path.

UVM_HDL_MAX_WIDTH

parameter int UVM_HDL_MAX_WIDTH = `UVM_HDL_MAX_WIDTH

Sets the maximum size bit vector for backdoor access. This parameter will be looked up by the DPI-C code using: vpi_handle_by_name( “uvm_pkg::UVM_HDL_MAX_WIDTH”, 0);

uvm_hdl_check_path

import "DPI-C" context function int uvm_hdl_check_path( string path )

Checks that the given HDL path exists. Returns 0 if NOT found, 1 otherwise.

uvm_hdl_deposit

import "DPI-C" context function int uvm_hdl_deposit( string path,
uvm_hdl_data_t value )

Sets the given HDL path to the specified value. Returns 1 if the call succeeded, 0 otherwise.

uvm_hdl_force

import "DPI-C" context function int uvm_hdl_force( string path,
uvm_hdl_data_t value )

Forces the value on the given path. Returns 1 if the call succeeded, 0 otherwise.

uvm_hdl_force_time

task uvm_hdl_force_time( string path,
uvm_hdl_data_t value,
time force_time = )

Forces the value on the given path for the specified amount of force_time. If force_time is 0, uvm_hdl_deposit is called. Returns 1 if the call succeeded, 0 otherwise.

uvm_hdl_release_and_read

import "DPI-C" context function int uvm_hdl_release_and_read(
string path,
inout uvm_hdl_data_t value

)

Releases a value previously set with uvm_hdl_force. Returns 1 if the call succeeded, 0 otherwise. value is set to the HDL value after the release. For ‘reg’, the value will still be the forced value until it has bee procedurally reassigned. For ‘wire’, the value will change immediately to the resolved value of its continuous drivers, if any. If none, its value remains as forced until the next direct assignment.

uvm_hdl_release

import "DPI-C" context function int uvm_hdl_release( string path )

Releases a value previously set with uvm_hdl_force. Returns 1 if the call succeeded, 0 otherwise.

uvm_hdl_read()

import "DPI-C" context function int uvm_hdl_read( string path,
output uvm_hdl_data_t value )

Gets the value at the given path. Returns 1 if the call succeeded, 0 otherwise.