PM7375-SC datasheet(217/430 Pages) PMC

217 / 430 page

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

201

10.1.93

Bit

Type

Function

Default

Bit 15

Unused

Bit 14

Unused

Bit 13

Unused

Bit 12

Unused

Bit 11

Unused

Bit 10

R/W

ASR_CNT[2]

Bit 9

R/W

ASR_CNT[1]

Bit 8

R/W

ASR_CNT[0]

Bit 7

R/W

AB_CAP[7]

Bit 6

R/W

AB_CAP[6]

Bit 5

R/W

AB_CAP[5]

Bit 4

R/W

AB_CAP[4]

Bit 3

R/W

AB_CAP[3]

Bit 2

R/W

AB_CAP[2]

Bit 1

R/W

AB_CAP[1]

Bit 0

R/W

AB_CAP[0]

Note, when the TALP Aggregate Bucket Capacity register is being modified, the

AGG_PR_EN bit located in the TALP Control register, should be set to zero.

AB_CAP[7:0]:

The AB_CAP[7:0] bits define the size of the aggregate token bucket. Tokens are

added to the bucket at the sustainable cell rate as determined by the

ASR_CNT[2:0] field. Tokens are consumed at the peak cell rate as determined

by the TALP Aggregate Peak cell rate register. As controlled by the

AGG_PR_EN bit in the TALP Control register, cell transmission is only allowed

when the aggregate token bucket is not empty. If the bucket is empty,

transmission proceeds at the bucket fill rate (i.e. sustainable cell rate).

ASR_CNT[2:0]:

The ASR_CNT[2:0] bits are used to select the sustainable cell rate based on a

derivative of the peak cell rate. ASR_CNT[2:0] is the roll over value of the

aggregate sustainable rate counter which is clocked using the aggregate peak

cell rate counter. For example, given an aggregate peak cell rate of 10 Mbit/s, to

obtain a sustainable cell rate of 2 Mbit/s, the ASR_CNT[2:0] field should be set to

four 100B.

PM7375-SC Datasheet(PDF) 217 Page - PMC-Sierra, Inc

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