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Update slave_driver grant timing to pass Ibex assertion checks (#295)

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udinator 2019-09-09 14:31:29 -07:00 • committed by GitHub
parent 8d3d87ae53
commit ac22439374
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1 changed files with 3 additions and 11 deletions
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14
dv/uvm/common/ibex_mem_intf_agent/ibex_mem_intf_slave_driver.sv
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@ -10,9 +10,6 @@ class ibex_mem_intf_slave_driver extends uvm_driver #(ibex_mem_intf_seq_item);
protected virtual ibex_mem_intf vif;
int unsigned min_grant_delay = 0;
int unsigned max_grant_delay = 10;
`uvm_component_utils(ibex_mem_intf_slave_driver)
`uvm_component_new
@ -58,20 +55,15 @@ class ibex_mem_intf_slave_driver extends uvm_driver #(ibex_mem_intf_seq_item);
join_none
endtask : get_and_drive
// TODO(udinator) - this direct send_grant logic is temporary until instruction fetch protocol
// issue is clarified (https://github.com/lowRISC/ibex/pull/293). After resolution, will re-add
// random delays insertion before driving grant to the ibex core.
virtual protected task send_grant();
int gnt_delay;
forever begin
while(vif.request !== 1'b1) begin
@(negedge vif.clock);
end
std::randomize(gnt_delay) with {
gnt_delay dist {
min_grant_delay :/ 1,
[min_grant_delay+1 : max_grant_delay-1] :/ 1,
max_grant_delay :/ 1
};
};
repeat(gnt_delay) @(negedge vif.clock);
if(~vif.reset) begin
vif.grant = 1'b1;
@(negedge vif.clock);