AR #21353 - Virtex-4 RocketIO - Do I have to issue a PMARESET if I change the selects on the clock multiplexers using the TX/RXCLKMODE attributes?

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Virtex-4 RocketIO - Do I have to issue a PMARESET if I change the selects on the clock multiplexers using the TX/RXCLKMODE attributes?

AR#	21353
Part	HW-Rocket_IO
Last Modified	2008-05-19 00:00:00.0
Status	Active
Keywords	PMARESET, clock select, multiplexer, TXCLKMODE, RXCLKMODE

Description

Keywords: PMARESET, clock select, multiplexer, TXCLKMODE, RXCLKMODE

Do I have to issue a PMARESET if I change the selects on the clock multiplexers using the TX/RXCLKMODE attributes?

Solution

Yes, a PMARESET should be issued if the clock multiplexer values are changed. There is a possibility of glitching when these are changed. Once PMARESET is issued, please follow the initialization sequence outlined in (Xilinx Answer 21012).