AR# 53450


Design Advisory for Zynq-7000 SoC, USB - ULPI interface requires input hold time of 1 ns


The Zynq SoC data sheet shows a minimum hold time (TULPICKD) of at least 1 ns, which implies a minimum ULPI PHY clock-to-out (CTO) specification of 1 ns (including board skew adjustments).


The ULPI specification does not specify a minimum CTO, therefore, you should be sure your PHY complies with the Zynq SoC data sheet hold requirement of 1 ns. Please refer to Zynq-7000 Data Sheets.

The TI TUSB1210 PHY minimum CTO is unspecified, but reported to be 100 ps minimum CTO and would not be compatible with Zynq-7000.

Consult your vendor's data sheet to be sure the PHY meets this and all other timing specifications.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47915 Design Advisory Master Answer Record for Zynq-7000 SoC Devices N/A N/A
AR# 53450
Date 06/20/2018
Status Active
Type Design Advisory
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