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AR #24970 - LogiCORE RapidIO - Control symbol might be lost when reinitialization is forced

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LogiCORE RapidIO - Control symbol might be lost when reinitialization is forced

AR#	24970
Part	IP-RapidIO-Serial
Last Modified	2007-10-15 00:00:00.0
Status	Active
Keywords	serial, high, speed, high-speed, PHY, logical, design environment, rio, rapid, IO, MGT, 9.1i, I/O, control, symbol, dropped

Description

Keywords: serial, high, speed, high-speed, PHY, logical, design environment, rio, rapid, IO, MGT, 9.1i, I/O, control, symbol, dropped

A control symbol that has been scheduled into the transmit pipeline might be lost when reinitialization is forced. This is not an issue for most control symbols, as auto-recovery is built in to the RapidIO protocol. However, it can be an issue when dealing with Link Request/Link Response control symbols.

Solution

Xilinx recommends setting the "Additional Link Requests Before Fatal" value on the Physical Configuration page of the GUI to a non-zero value. Most other vendors allow this functionality as well. By allowing multiple Link Requests prior to transitioning to a fatal error state, it will allow the RapidIO link to recover in the unlikely event that a Link Request or Link Response is lost.

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