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  3. AR# 5299: LogiCORE PCI - What loads should be used when maximum clock-to-out timing is calculated?

AR# 5299

LogiCORE PCI - What loads should be used when maximum clock-to-out timing is calculated?

描述

General Description:

What loads should I use when calculating maximum clock-to-out timing?

解决方案

The 5.0v PCI specification calls for the output buffer to be loaded with 50pF when clock-to-out timing is measured.

The 3.3v PCI specification (including the 66MHz spec) calls for the output buffer to be loaded with 10pF with a 25 ohm resistor in parallel.

AR# 5299
日期 12/15/2012
状态 Active
Type 综合文章