System does not boot when PCIe express Card is inserted in system. Using Spartan-6 PCIe Integrated Endpoint Block 1.3

Question

Hi,
I am using Spartan-6 PCIe Endpoint Block core v1.3 and I am using ISE 12.1. I have used the PIO example design,
modified it according to our design.
The core is configured as below:
BAR0 - 8KB, 32-bit, Memory Type
Lanes - x1
Clock - 125 MHz (system clock)
The card is a custom board. When the card is pluged into the system the system does not boots, it hangs.
I have tried debugging using chipscope and monitored trn_lnk_up_n, trn_reset_n and trn_clk. trn_lnk_up_n stays
high (deasserted), trn_reset_n stays low (asserted), trn_clk is low (No clk).
What might be the issue?
Thanks & Regards.

Answer 1

Thanks Gabor, for the response.
I refered couple of answer records like AR# 34873 and AR# 34894, I monitored trn_reset_n, sys_reset_n, clock_locked, PLLLKDET and RESETDONE signals as suggested in AR# 34894.
Status as follows:
SYS_RESET_N = 1 (deasserted)
TRN_RESET_N = 0 (asserted)
CLOCK_LOCKED = 0 (deasserted)
PLLLKDET = 0 (deasserted)
RESETDONE = 0 (deasserted)
which means the transceiver PLL frequency is not within the predetermined tolerance. Is this problem related to the PCIe Jitter Attenuator I am using on the board to derive 125MHz from 100MHz system Clock.
Thanks & Regards