PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 260

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

13.2.3
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Figure 21 Switch Timing - DSOs without CAS
NSE RC1FP.INT
SBSLITE/NSE non-DS0 Level Switching with SBI336 Devices
The SBSLITE and NSE supports another mode of operation that has lower latency and lower
power when not switching at the DS0 level. In this mode both of these devices become a column
switch rather than a DS0 switch. This also saves SW configuration since only one row of the
switch configuration rams has to be configured rather than all nine rows.
When switching DS0 through the system the SBSLITE must store an entire frame of DS0s before
routing them to the destination to allow for the last DS0 of a frame to be switched to the first DS0
of the output. When doing column switching only one row of the SBI structure needs to be stored
before switching can take place.
The same diagram from the previous section can be used here. The following timing diagram
shows the system timing for this mode of operation.
SBI Frame Time
SBS RC1FP.INT
SBS OC1FP.INT
SBS OCMP.INT
SBS IC1FP.INT
SBS TCMP.INT
NSE CMP.INT
Internal Sigs
All CMPs
C1FP
0us
250us
SBSLITE™ Telecom Standard Product Data Sheet
500us
Preliminary
259