PM7351 datasheet(21/174 Pages) PMC

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RELEASED

PM7351 S/UNI-VORTEX

DATA SHEET

PMC-1980582

ISSUE 5

OCTAL SERIAL LINK MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

• LVDS link and S/UNI-VORTEX identifiers are added to each cell (along with

the PHY identifier already added by S/UNI-DUPLEX) for use by ATM layer to

identify the cell source.

• Back-pressure sent to far end to prevent overflow of receiver FIFO.

LVDS TRANSMIT DIRECTION

• Per PHY and microprocessor port back-pressure used on each of the 8 links

to prevent overflow of downstream buffers.

• Device polling: provides Utopia-like TCA status for 264 PHYs (includes 8

control channels) based on back-pressure from the LVDS links.

• Cell transfer: Bus master adds a PHY address to each cell via a 12 bit

identifier. S/UNI-Vortex decodes and accepts cells for its links based on

software configured base addresses.

PARALLEL BUS INTERFACE:

• Both directions: 16 bit wide, 50 MHz max clock rate, bus slave.

• Cells transferred to the bus: Utopia L2 compatible with optional expanded

length cells. Appears as single PHY, with a cell prepend identifying the

source PHY ID of each cell. Alternatively, Utopia L2 compliance is supported

by placing the PHY ID inside the UDF/HEC fields of a standard ATM cell.

• Cells received from the bus: The Any-PHY bus is similar to Utopia L2 but with

optional expanded length cells and expanded addressing capabilities. The

S/UNI-VORTEX appears to the bus master as a 264 port multi-PHY device (8

links, each with 32 PHYs & communication channel). PHY address is added

as cell prepend or optionally in HEC/UDF field when standard length cells are

desired.

MICROPROCESSOR INTERFACE

• 8 bit data bus, 8 bit address bus.

• Provides read/write access to all configuration and status registers.

• Provides CRC32 calculation and cell transfer registers to support an

embedded microprocessor to microprocessor communication channel

over the LVDS link.

PM7351 Datasheet(PDF) 21 Page - PMC-Sierra, Inc