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PM7375-SC Datasheet(PDF) 221 Page - PMC-Sierra, Inc

Part # PM7375-SC
Description  LOCAL ATM SAR & PHYSICAL LAYER
PDF  430 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM7375-SC Datasheet(HTML) 221 Page - PMC-Sierra, Inc

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PM7375 LASAR-155
DATA SHEET
PMC-931127
ISSUE 6
LOCAL ATM SAR & PHYSICAL LAYER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
205
10.1.96
Register 0x90 (0x240): TATS Control/Interrupt Enable
Bit
Type
Function
Default
Bit 15
R/W
QSTARV_EN
0
Bit 14
R/W AGR_CBRC_EN
0
Bit 13
Unused
X
Bit 12
Unused
X
Bit 11
Unused
X
Bit 10
Unused
X
Bit 9
Unused
X
Bit 8
Unused
X
Bit 7
R/W
CBS_CNT[7]
1
Bit 6
R/W
CBS_CNT[6]
1
Bit 5
R/W
CBS_CNT[5]
1
Bit 4
R/W
CBS_CNT[4]
1
Bit 3
R/W
CBS_CNT[3]
1
Bit 2
R/W
CBS_CNT[2]
1
Bit 1
R/W
CBS_CNT[1]
1
Bit 0
R/W
CBS_CNT[0]
1
The TATS Control/Interrupt Enable register is used to configure and control the
TATS block.
CBS_CNT[7:0]:
The CBS_CNT[7:0] bits indicate the Credit Basket Size for Credit Based Rate
Control (CBRC) enforcement. VBR VCs are subject to peak cell rate and
sustainable cell rate shaping as dictated by the TATS Service Rate Queues. In
addition VBR VCs can also be constrained by an internal credit basket whose
size is specified using the CBS_CNT value.
Cell credits are expected to be generated by the downstream ATM entity
and relayed to the LASAR-155 device using the GFC header field in receive ATM
cells. Based on the reception of the appropriate GFC codepoint, the CBRC
credit basket is topped off. Each cell transmitted on a VC with CBRC consumes
a single credit regardless of the VC. Cells associated with CBRC VCs are only
allowed to be sent if there is an available credit in the aggregate CBRC credit
basket. If a credit is not available, transmission on CBRC VCs is quenched.
AGR_CBRC_EN:
The AGR_CBRC_EN bit enables aggregate CBRC VC traffic enforcement using
the CBRC credit basket. When AGR_CBRC_EN is logic one, aggregate CBRC



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