WinSystems PPM-C407 User manual

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Errata Notice

WinSystems

, Inc.  715 Stadium Drive  Arlington, Texas 76011

TEL:817-274-7553  FAX:817-548-1358  http://www.winsystems.com

Board:

PPM-C407-38xx

BIOS Revision:

N/A

EC Revision:

N/A

Known Issues

1. ALE signal is not connected to the bus in PCB revision G and earlier.

ISSUE 1 : ALE Signal is not connected to the bus

Symptom:

Some peripheral devices do not function properly on the I/O bus, typically failing during bus

enumeration.

Root Cause:

The ALE signal is not connected to Pin B28 of the PC/104 connector. ALE by definition states

that when high, addresses SA[23:17] are valid and can be latched. Since I/O addresses are

limited to 16 bits (SA[15:0]), most PC/104 peripherals do not require this signal. However,

peripherals that utilize a multiplexed address and data bus, like the SJA1000, use ALE to switch

between address and data.

Resolution:

A validated hardware rework and firmware change is available to connect the ALE pin to the

controller. Please contact an Application Engineer for details on Revision G PCB products. The ALE

signal is corrected in revision H and later PCBs and requires no modification.