PM5364 pmc-sierra, PM5364 Datasheet - Page 134

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

10.10 Latency Through TUPP 2488
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
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Payload Processing Loopback
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Table 16 outlines the latency through the various blocks in TUPP 2488. All blocks (except some
parts of the CML subsystems) operate off a 77.76 MHz clock. Therefore, the clock period is
12.86 ns. Table 16 gives the latency in 12.86 ns clocks for each block.
Traffic from the system egress is sent to the line egress. The ingress time stage switches are
used but the internal crossbar is not used. An external crossbar and time stage switches on
the system egress are needed to complete the Time:Space:Time fabric.
Traffic from the line ingress passes through the payload processor blocks, bypasses the
internal Time:Space:Time fabric completely and is sent out the line egress parallel bus.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
134