PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 52

• Manufacturer Part Number: PM8611-BIAP
• Manufacturer: PMC [PMC-Sierra, Inc]

10.1.12 SBI336 Bus Format
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Table 19 Fractional Rate Format
The 77.76 MHz SBI336 bus is exactly four interleaved 19.44 MHz SBI buses. There is a slight
difference between the two formats to accommodate the increased clock rate. Instead of using the
common Add/Drop C1FP alignment of the SBI bus to reference the JUST_REQ signal, the Drop
bus C1FP alignment is used. This aids 77.76 MHz bus timing by allowing buffering and retiming
logic to be put between SBI336 devices. This change also aids construction of larger SBI cross
connect systems using smaller buffers between devices by controlling the C1 frame alignment
independently in each direction.
ROW
1
2
3
4
5
6
7
8
9
SPE
COL #
SBI COL#
1,4,7,10,13 16
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Fractional
1
I
I
I
I
I
I
I
I
I
Fractional
2-84
I
I
I
I
I
I
I
I
I
Fractional
Col 85
268
I
I
I
I
I
I
I
I
I
SBSLITE™ Telecom Standard Product Data Sheet
Preliminary
51