AR #21305 - Virtex-II Pro, Virtex-II Pro X, Virtex-4 FX RocketIO - Is there any difference in the way the TXRESET signal works in the Virtex-II Pro vs. Virtex-II Pro X vs. Virtex-4 MGTs?

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Virtex-II Pro, Virtex-II Pro X, Virtex-4 FX RocketIO - Is there any difference in the way the TXRESET signal works in the Virtex-II Pro vs. Virtex-II Pro X vs. Virtex-4 MGTs?

AR#	21305
Part	HW-Rocket_IO
Last Modified	2008-05-20 00:00:00.0
Status	Active
Keywords	MGT, TXINHIBIT, TXDATA, TXRESET

Description

Keywords: MGT, TXINHIBIT, TXDATA, TXRESET

Does the TXRESET signal work the same in the Virtex-II Pro, Virtex-II Pro X and Virtex-4 MGTs? Does it affect TXDATA?

Solution

In Virtex-II Pro, the TXRESET forces the TXDATA to the PMA to be all "0"s. The TXINHIBIT has priority over TXRESET.

In Virtex-II Pro X, the TXRESET forces the TXDATA to the PMA to be "0x55555555" (basically a 10101010 pattern). The TXRESET has priority over TXINHIBIT.

If TXRESET is asserted, the TXDATA to the PMA is "0x55555555" regardless of TXINHIBIT.

If TXRESET is deasserted, then the TXINHIBIT will change the data input to the PMA to "0x00000000."

In Virtex-4, the TXRESET forces the TXDATA to the PMA to be all "0"s. The TXINHIBIT has priority over TXRESET.

For more information, refer to (Xilinx Answer 21304).