Visible to Intel only — GUID: rto1704464831503
Ixiasoft
Visible to Intel only — GUID: rto1704464831503
Ixiasoft
2.5.9. PERSTn pin from HVIO banks fails to reset PCIe links
Description
For a PCIe link in a transceiver bank, there are two pins in HVIO banks with optional function as PERST# for the PCIe link. You select either one of the reset pins. For the reset pin not used as PERST#, it can be used as a generic HVIO signal. For example, if the PIN_PERST_N_CVP_L1A_0 pin in Bank 5A is assigned as PERST# for the PCIe link in Bank L1A, the PIN_PERST_N_CVP_L1A_1 pin in Bank 5B can be assigned as a generic HVIO.
Due to an issue in ES devices, assigning either of the two PERST# reset pins will not reset the PCIe link. This issue will be fixed in future Quartus® Prime software releases and production devices.
Workaround
Assign both p0_pin_perst_n_i and p0_pin_perst_n_1_i ports to the location of the reset pins in HVIO banks as shown in the following table.
PCle link in GTS Bank | HVIO reset pins to pin perst port mapping | |
---|---|---|
p0 -pin_perst_n_i | p0_pin_perst_n_1_i | |
Bank L1A |
PIN_PERST _N_CVP_L1A_0 | PIN_PERST_N_CVP_L1A_1 |
Bank L1B |
PIN_PERST_N_CVP_L1B_0 | PIN_PERST_N_CVP_L1B_1 |
Bank L1C |
PIN_PERST_N_CVP_L1C_0 | PIN_PERST_N_CVP_L1C_1 |
Bank R4A |
PIN_PERST_N_R4A_1 | PIN_PERST_N_R4A0 |
Bank R4B |
PIN_PERST_N_R4B_1 | PIN_PERST_N_R4B_0 |
Bank R4C |
PIN_PERST_N_R4C_1 | PIN_PERST_N_R4C_0 |
- set_instance_assignment -name WEAK_PULL_DOWN ON -to p0_pin_perst_n_i
- set_instance_assignment -name WEAK_PULL_DOWN ON -to p0_pin_perst_n_1_i
Connect PERST# to either one of the reset pins. For the other reset pin not used as PERST#, it must be left floating at board level.
For example, for a PCIe link in GTS bank L1A, assign p0_pin_perst_n_i to pin PIN_PERST_N_CVP_L1A_0 and assign p0_pin_perst_n_1_i to pin PIN_PERST_N_CVP_L1A_1.
If you connect PERST# to PIN_PERST_N_CVP_L1A_0, leave PIN_PERST_N_CVP_L1A_1 unconnected at board level.
Tie the i_gpio_perst0_n port to logic high.