![](http://datasheet.mmic.net.cn/330000/PM7329-BI_datasheet_16444382/PM7329-BI_176.png)
PM7329 S/UNI-APEX-1K800
DATASHEET
PMC-2010141
ISSUE 2
ATM TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
162
MPLWord
En (bit #)
Bits
Parameter
Description
5
VcTxStatus
EOM indication. When VcTxStatus = 0, the next cell
transmitted is considered the BOM. Used to indicate
when VcTxBOMClp should be re-evaluated.
4
VcTxBOMClp
State of the BOM’s CLP bit during transmit. Used to
maintain VcCLP0Cnt during FCQ congestion and
also during EPD/PPD congestion when GFR Mode =
1.
3:2
VcRxStatus
00:
Next cell queued is considered the BOM.
01:
EOM.
Next cell queued is considered a COM or
10:
including the EOM will be discarded.
Early packet discard. All cells up to and
11:
will be discarded
Partial packet discard. All cells but the EOM
VC tear down and watch dog re-allocation will set this
parameter to zero.
1
VcRxBOMClp
State of the BOM’s CLP bit during receive. Used to
maintain VcCLP0Cnt during FCQ congestion and
also during EPD/PPD congestion when GFR Mode =
1.
0
VcRxORClp
VcQueue = 1 (FCQ), VcGFRMode = 0, Port Class not
shaped:
This is a running OR of all the CLPs that have been
received since the BOM. Used by congestion control
to invoke EPD discard
Reserved in all other cases.
VcCongMode = 1 (Cell by Cell Congestion)
5:0
Unused
Reserved
33:16
VcQHeadPtr
Points to the first cell in the VC queue. A value of
zero indicates that the queue is empty.
VC tear down and watch dog re-allocation will set this
parameter to zero.
2
15:13
VcCLP0Cnt[5:
3]
Second 3 bits of a 13-bit count of CLP0 cells in both
VC and Class. See MSB for description.