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AR# 63261

UltraScale DDR3/DDR4/QDRII+ - Multi-driver errors found during LINT check

Description

Version Found: DDR3 v6.1, DDR4 v6.1, QDRII+ v6.1

Version Resolved: See (Xilinx Answer 69036) for DDR3, (Xilinx Answer 69035) for DDR4, and (Xilinx Answer 69038) for QDRII+.

W415 multi-driver errors can occur when running the SpyGlass Lint Check on MIG UltraScale DDR3, DDR4, or QDRII+ design.

For example:

[629] W415   Error  ./mig_0_example/mig_0_example.srcs/sources_1/imports/mig_0/rtl/ip_top/example_top.sv          175     10    Signal 'example_top.c0_ddr4_app_rd_data[63:0]' has multiple simultaneous drivers
[27D] W415  Error   mig_0_example/mig_0_example.srcs/sources_1/ip/mig_0/ip_0/rtl/phy/mig_qdriip_phy_v1_1_qdriip_cal_addr_decode.sv            1093    10    Signal 'example_top.u_mig_0.inst.u_mig_qdriip_phy.inst.phycal.cal.caladdrdecode.pat_ab_matched_r' has multiple simultaneous drivers

Solution

These multi-driver errors can occur during the Lint check for:

  • signal 'example_top.c0_ddr4_app_rd_data[63:0]' located inside example_top.sv for DDR3 and DDR4 designs
    and
  • signal 'example_top.u_mig_0.inst.u_mig_qdriip_phy.inst.phycal.cal.caladdrdecode.pat_ab_matched_r' located inside mig_qdriip_phy_v1_1_qdriip_cal_addr_decode.sv for QDRII+ designs.

These multi-driver error messages occur only during the Lint check and are safe to ignore as the Vivado synthesis tool handles these signals properly.

Revision History:

01/08/2015 - Initial Release

Linked Answer Records

Master Answer Records

AR# 63261
Date 12/15/2017
Status Active
Type Known Issues
Devices
  • Zynq UltraScale+ MPSoC
  • Kintex UltraScale
  • Kintex UltraScale+
  • More
  • Virtex UltraScale
  • Virtex UltraScale+
  • Less
Tools
  • Vivado Design Suite
  • Vivado Design Suite - 2014.4
IP
  • QDRII+ SRAM
  • DDR3 SDRAM
  • DDR4 SDRAM
  • MIG UltraScale
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