PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 32
PM5366-PI
Manufacturer Part Number
PM5366-PI
Description
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5366-PI.pdf
(267 pages)
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DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
devised to use a portion of the DS3 payload. Given that these protocols are
subject to change, they are best supported by external programmable logic.
Figure 3 illustrates one implementation. Other implementations and applications
are possible.
In the ingress direction, the framed DS3 is presented to an FPGA, whose
responsibility it is to identify the utilitized bits of the payload. Valid bits are
indicated to the Ingress Flexible Bandwidth Port via an enable signal, IFBWEN.
The bits are collected into bytes by the TEMAP-84 and inserted into the payload
of the SBI Drop bus.
In the egress direction, an FPGA formats the payload of a DS3, while the
TEMAP-84 inserts the DS3 frame overhead. The FPGA contains a data buffer.
Based on the DS3 frame alignment dictated by the TMFPO signal, the FPGA
inserts bits from the data buffer into the DS3 payload according to the protocol
supported. To ensure the data buffer is replenished, the FPGA asserts the
EFBWDREQ signal to initiate the transfer of a bit. The Egress Flexible
Bandwidth Port responds by asserting EFWBEN coincident with EFWBDAT
presenting valid data. The SBI Add bus participates by modulating its
SAJUST_REQ output to match the SBI data rate to that required to keep internal
FIFOs centered.
ISSUE 1
20
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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