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fixed error in slot calculation

This commit is contained in:
AngeloJacobo 2024-05-25 13:49:48 +08:00
parent 18283f4436
commit 57aebc6eef
1 changed files with 19 additions and 12 deletions
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31
rtl/ddr3_controller.v
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@ -2397,37 +2397,44 @@ ALTERNATE_WRITE_READ: if(!o_wb_stall_calib) begin
reg[2:0] slot_number, read_slot, write_slot, anticipate_activate_slot, anticipate_precharge_slot;
reg[2:0] remaining_slot;
begin
slot_number = 0;
read_slot = 0;
write_slot = 0;
anticipate_activate_slot = 0;
anticipate_precharge_slot = 0;
remaining_slot = 0;
delay = 0;
// find read command slot number
delay = {{(32-4){1'b0}},CL_nCK};
for(slot_number = 0 ; delay != 0 ; delay = delay - 1) begin
slot_number = slot_number - 1'b1;
slot_number[1:0] = slot_number[1:0] - 1'b1;
end
read_slot = slot_number;
read_slot[1:0] = slot_number[1:0];
// find write command slot number
delay = {{(32-4){1'b0}},CWL_nCK};
for(slot_number = 0 ; delay != 0; delay = delay - 1) begin
slot_number = slot_number - 1'b1;
slot_number[1:0] = slot_number[1:0] - 1'b1;
end
write_slot = slot_number;
write_slot[1:0] = slot_number[1:0];
// find anticipate activate command slot number
if(CL_nCK > CWL_nCK) slot_number = read_slot;
else slot_number = write_slot;
if(CL_nCK > CWL_nCK) slot_number[1:0] = read_slot[1:0];
else slot_number[1:0] = write_slot[1:0];
delay = ps_to_nCK(tRCD);
for(slot_number = slot_number; delay != 0; delay = delay - 1) begin
slot_number = slot_number - 1'b1;
slot_number[1:0] = slot_number[1:0] - 1'b1;
end
anticipate_activate_slot = slot_number;
anticipate_activate_slot[1:0] = slot_number[1:0];
// if computed anticipate_activate_slot is same with either write_slot or read_slot, decrement slot number until
while(anticipate_activate_slot == write_slot || anticipate_activate_slot == read_slot) begin
anticipate_activate_slot = anticipate_activate_slot - 1'b1;
while(anticipate_activate_slot[1:0] == write_slot[1:0] || anticipate_activate_slot[1:0] == read_slot[1:0]) begin
anticipate_activate_slot[1:0] = anticipate_activate_slot[1:0] - 1'b1;
end
//the remaining slot will be for precharge command
anticipate_precharge_slot = 0;
while(anticipate_precharge_slot == write_slot || anticipate_precharge_slot == read_slot || anticipate_precharge_slot == anticipate_activate_slot) begin
anticipate_precharge_slot = anticipate_precharge_slot - 1'b1;
while(anticipate_precharge_slot[1:0] == write_slot[1:0] || anticipate_precharge_slot[1:0] == read_slot[1:0] || anticipate_precharge_slot[1:0] == anticipate_activate_slot[1:0]) begin
anticipate_precharge_slot[1:0] = anticipate_precharge_slot[1:0] - 1'b1;
end
//the remaining slot will be for precharge command