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AR# 63225

7 Series GTX/GTH - Critical Warning is reported when I attempt to use QPLLOUTREFCLK to drive fabric logic

Description

When I try to use QPLLOUTREFCLK to drive fabric logic, the following Critical Warning is reported:

Phase 3.1 Initial Routing Verification

Post Initial-Routing Verification
---------------------------------
CRITICAL WARNING: [Route 35-54] Net: I_CPRI_SERDES/I_SERDES_QUAD_1/I_SERDES_COMMON/TEST_PORT[10] is not completely routed.
Resolution: Run report_route_status for more information.

Unroutable connection Types:
----------------------------
Type 1 : GTXE2_COMMON.QPLLOUTREFCLK->BUFGCTRL.I0
-----Num Open nets: 1
-----Representative Net: Net[48] I_CPRI_SERDES/I_SERDES_QUAD_1/I_SERDES_COMMON/TEST_PORT[10]
-----GTXE2_COMMON_X0Y1.QPLLOUTREFCLK -> BUFGCTRL_X0Y25.I0
-----Driver Term: I_CPRI_SERDES/I_SERDES_QUAD_1/I_SERDES_COMMON/gtxe2_common_i/QPLLOUTREFCLK Load Term [24394]: I_BUFG_TEST/I
Phase 3.1 Initial Routing Verification | Checksum: 90d59b77

Solution

QPLLOUTREFCLK cannot be used to drive fabric logic.
 
It is dedicated for connection between GTE2_COMMON and GTE2_CHANNEL.
 
If you need to use a reference clock to drive fabric logic, the O or ODIV2 of IBUFDS_GTE2 is recommended.
AR# 63225
Date Created 12/30/2014
Last Updated 01/07/2015
Status Active
Type General Article
Devices
  • Kintex-7
  • Virtex-7