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AR# 52026

Zynq-7000 AP SoC, GigE - Back-off Time is more Aggressive than the Standard Requirement

Description

The controller's back-off time does not strictly adhere to the Truncated Binary Exponential Back-off algorithm.

Solution

In some cases, the controller is more aggressive. Depending on the system, more or less collisions will occur. The algorithm discrepancy is not observed until afterfive consecutive collisions and only applies to the controller in 100 Base-T mode.

Impact:
Trivial. Additional (or fewer) collisions will occur after the fifth consecutive collision.
Work-around:
None.
Configurations Affected:
System using GigE in 100 Base-T mode.
Device Revision(s) Affected:
All. No plan to fix. Refer to (Xilinx Answer 47916) Zynq-7000 AP SoC Silicon Revision Differences Answer Record.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47916 Zynq-7000 AP SoC Devices - Silicon Revision Differences N/A N/A
AR# 52026
Date Created 01/31/2013
Last Updated 01/31/2013
Status Active
Type Design Advisory
Devices
  • Zynq-7000