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AR# 61933

PG066 (v5.2) - Description of SYNC~ behaviour in Figure 3-8 is incorrect

Description

In PG066, the JESD204 v5.2 LogiCORE IP Product Guide, Figure 3-8 describes Deterministic Latency across the JESD204B Link.  
61933-1.jpg


Figure 3-8 shows SYNC~ going high before the transmit device starts transmitting, while the text describing this states "SYNC~ signal going Low". 

Which is correct?

Solution

SYNC~ is an active low synchronization request signal, therefore it is deasserted by going high. 

The text describing SYNC~ behavior on page 54 of PG066 (v5.2) should state:
 
"When the transmit device detects the SYNC~ signal going High, it waits until the next LMFC crossing and starts transmitting data."

PG066 (v6.0) includes this updated accurate description.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
54480 LogiCORE IP JESD204 - Release Notes and Known Issues for Vivado 2013.1 and newer tools N/A N/A
AR# 61933
Date Created 09/05/2014
Last Updated 10/14/2014
Status Active
Type General Article
Devices
  • Kintex-7
  • Artix-7
  • Virtex-7