PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 125

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
9.35 Flexible Bandwidth Ports
9.36 JTAG Test Access Port
PROPRIETARY AND CONFIDENTIAL
Flexible Bandwidth Port may be output. The SBI Bus Data Formats section
provides the details of the mapping formats.
Links inserted into the SBI bus can be synchronous to the SBI bus (by setting
SYNCH_TRIB=1 in the INSBI Control RAM) or timed from the upstream data
source via the sonet/sdh mapper, M13, or DS3/E3 framer. When SYNCH_TRIB
is logic 0, the INSBI makes link rate adjustments by adding or deleting an extra
byte of data over a 500 µS interval based on buffer fill levels. Timing
adjustments are detected by the receiving SBI interface by explicit signals in the
SBI bus structure. When SYNCH_TRIB is logic 1, the tributary is “locked” in
which no timing adjustments are allowed. The frame slip buffer (ELST) must be
in the datapath in “locked” mode.
The INSBI always sends valid link rate information across the SBI Drop bus,
which contains both ClkRate(1:0) and Phase(3:0) field information. this gives an
external device receiving data from the INSBI three methods of creating a
recovered link clock: the ClkRate field, the Phase field, or just the rate of data
flow across the SBI drop bus. INSBI does not generate the Phase field for
DS3/E3 tribs.
For byte synchronous mapping applications, channelized T1s inserted into the
SBI bus optionally have the channel associated signaling (CAS) bits explicitly
defined and carried in parallel with the DS0s or timeslots.
Three Flexible Bandwidth Ports are provided to supply arbitary bandwidth signals
to the SBI bus. Each port is associated with one SPE on the SBI bus and may
carry up to the capacity of the SPE (49.5 Mbit/s).
In the ingress direction, data is presented as a three wire interface: a clock of up
to 51.84 MHz, bit serial data and an enable. No flow control is provided, so the
average data rate must be less than 49.5 Mbit/s.
In the egress direction, a simple handshake controls the data flow. For each
cycle that the EFBWDREQ[n] input is high, a bit may be output on the
EFBWDAT[n] output. The data is supplied from the SBI bus FIFO, which will be
kept half full through the SAJUST_REQ asserts as required.
The JTAG Test Access Port block provides JTAG support for boundary scan.
The standard JTAG EXTEST, SAMPLE, BYPASS, IDCODE and STCTEST
ISSUE 1
113
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84