Datasheet > 28478-ERR-003-A_15

28478-ERR-003-A_15

更新时间： 2024-02-29 02:16:14

品牌	Logo	应用领域
泰科 - TE		/
页数	文件大小	规格书
3页	53K
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MUSYCC Non-Conformance

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500391A

July 15, 2002

CN8478/74A/72A/71A—Rev. C.

Errata: MUSYCC Non-Conformance

Product Affected:

MUSYCC CN8478/74A/72A/71A devices—Rev. C

Non-Conformance Information

This information specifies the known anomalies and non-conformance to stated information

for the MUSYCC CN8478/74A/72A/71A devices.

The revision C is designated by Revision ID = 0Ch in CN8478 PCI Configuration Space—

Function 0 and Function 1.

1. Jump Service Request

Description:

MUSYCC cannot process a jump service request from a host-owned, no-poll message

descriptor. What is meant by the word “from” is as follows. During message descriptor

processing, if MUSYCC encounters a host-owned descriptor, MUSYCC stops processing that

message descriptor and proceeds to check other groups for a message descriptor that it has

permission to process. If polling is set, MUSYCC returns to that same message descriptor to

see if it has permission to process that message descriptor. The message descriptor where

MUSYCC stops, due to host ownership, is the “from” message descriptor. This message

descriptor is a sentinel, or a placeholder, to which MUSYCC must always return. If polling is

disabled—by setting the No Poll (NP) bit to 1 in the message descriptor—MUSYCC will not

check that message descriptor again until the host requests it to do so through a jump service

request. When a jump service request is issued, MUSYCC is supposed to jump to the message

descriptor that is pointed by the transmit head pointer. However, MUSYCC first returns to the

“from” message descriptor to confirm buffer ownership. If the “from” buffer is MUSYCC-

owned, then MUSYCC returns to process the transmit head pointer, and the subsequent

message descriptors, correctly completing the jump service request. If the “from” buffer

remains host-owned when MUSYCC returns to it after a jump service request, then correct

completion of the jump service request only occurs for the first few jump service requests after

device initialization. After about three jump service requests (which remain pointing to host-

owned buffers), MUSYCC stops responding to subsequent jump service requests and that

channel must be reactivated to continue normal channel processing. During this failure

condition, MUSYCC starts to poll the sentinel message descriptor (for the specific channel that

requested jump service), even if the message descriptor is configured for No Poll (NP bit = 1).

Mindspeed Technologies™

Mindspeed Proprietary and Confidential

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