PM7367 datasheet(52/323 Pages) PMC

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PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE

Field

Description

RCC[6:0]

The Receive Channel Code (RCC[6:0]) bits are used by

the RMAC to indicate which channel an RPD is

associated with. Legal values for this field are 0 to 31.

For a linked list of RPDs, all the RPDs’ RCC fields are

valid, i.e. all contain the same channel value.

The Chain End (CE) bit indicates the end of a linked list of

RPDs. When CE is set to logic one, the current RPD is

the last RPD of a linked list of RPDs. When CE is set to

logic zero, the current RPD is not the last RPD of a linked

list.

The CE bit is valid for all RPDs written by the RMAC to

the Receive Ready Queue. When a packet requires only

one RPD, the CE bit is set to logic one. The CE bit is

ignored for all RPDs read by the RMAC from the Receive

Free Queues, each of which is assumed to point to only

one buffer, i.e. not a chain.

Offset[1:0]

The Offset[1:0] bits indicate the byte offset of the data

packet from the start of the buffer. If this value is non-

zero, there will be ‘dummy’ (i.e. undefined) bytes at the

start of the data buffer prior to the packet data proper.

For a linked list of RPDs, only the first RPD's Offset field

is valid. All other RPD Offset fields of the linked list are

set to 0.

Status [5:0]

The Status[5:0] bits indicate the status of the received

packet.

Status[0] Rx buffer overrun

Status[1] Packet exceeds max. allowed size

Status[2] CRC error

Status[3] Packet Length not an exact no. of bytes

Status[4] HDLC abort detected

Status[5] Unused (set to 0)

For a linked list of RPDs, only the last RPD's Status field

is valid. All other RPD Status fields of the linked list are

invalid and should be ignored. When a packet requires

only one RPD, the Status field is valid.

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