Critical Issue
Description
ALTMEMPHY-based designs created with a version of the high-performance controller (HPC II) earlier than 11.0, with the Enable Auto Power Down option turned on, violate refresh to precharge command timing, breaching JEDEC requirement.
This issue affects all designs created in a pre-11.0 version of HPC II, with the Enable Auto Power Down option turned on.
Your design fails to simulate and doesn’t work in hardware.
Resolution
To meet the JEDEC requirement, perform the following steps:
- Open the alt_ddrx_bank_timer.v file.
- Locate the following command:
always @ (*)
begin
cs_can_power_down [w_cs] = power_saving_enter_ready [w_cs]
& chip_idle;
end
and change to:
always @ (posedge ctl_clk or negedge ctl_reset_n)
begin
if (!ctl_reset_n)
cs_can_power_down [w_cs] <= 1\'b0;
else
cs_can_power_down [w_cs] <= power_saving_enter_ready
[w_cs] & chip_idle;
end
This issue will be fixed in a future version.