2. Support
  3. AR# 5202: LogiCORE PCI - How does the LogiCORE interface handle single-cycle grants? Does the assertion of M_ADDR_N always mean that a transaction is starting?
  4. AR# 52026: Zynq-7000 SoC, GigE - Back-off Time is more Aggressive than the Standard Requirement

AR# 52026

Zynq-7000 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 after five 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 SoC Silicon Revision Differences Answer Record.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47916 Zynq-7000 SoC Devices - Silicon Revision Differences N/A N/A
AR# 52026
Date 05/25/2018
Status Active
Type Design Advisory
Devices