PM5364 pmc-sierra, PM5364 Datasheet - Page 198

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

13.8.3
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Wideband Column Switching
The TUPP 2488 wideband switching supports low latency, low power switching. The MSUs and
CCB are column switches. One row (1080 columns) worth of switch addresses is to be
programmed in each block
When doing column switching only one row of the frame structure needs to be stored before
switching can take place.
Figure 41 shows the system timing for this mode of operation. A similar approach can apply to
any number of SBS devices and NSE external to TUPP 2488s system side.
Figure 41 Column Switching (Hairpinning Example)
In the figure shown, an internal flywheeled, per frame EJ0 is shown. Note that CMP should not
change for any switch during the per frame EJ0 pulse, as this is where CMP is sampled for all
switches. The IC1(J0) at the input to each switch is shown, along with the location where each
switches actual internal CMP changes.
Egress MSU CMP
Ingress MSU CMP
Frame boundary
Eg MSU page
Per frame EJ0
Ing MSU IC1
Ing MSU page
CCB CMP
CCB page
Eg MSU IC1
CCB IC1
EJ0
0us
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
250us
500us
Released
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