PMC-980237 (R5)

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

© 1999 PMC-Sierra, Inc.

PMC-Sierra,Inc.

Octal EXACT™ Bus Switch Matrix

PM3390

FEATURES

• Sixteen Gbit/s, protocol-independent

switching matrix expandable to 32 Gbit/s.

• Provides eight gigabit, full-duplex

EXACT™ Bus ports that each support an

EXACT switch port controller.

• Provides non-blocking connection

between eight EXACT Bus (Ethernet

Switching, Access, Control, and

Termination) rings.

• Supports non-blocking connections

between sixteen EXACT Bus rings to

provide a system bandwidth of

32 Gbit/s using four PM3390 devices.

• Destination lookup table maps logical

EXACT ports to physical PM3390 ports.

Destination lookup table can be

dynamically allocated.

• Provides visibility into internal dataflow to

allow external flow control in systems that

do not use the EXACT Bus link protocol.

• Each chip supports the EXACT Bus

Protocol, which is a 10-bit,

unidirectional insertion ring running at

125 MHz or 135 MHz.

• EXACT Bus ports allow simple box-to-

box, card-to-card, or chip-to-chip

interconnect.

• 8B/10B EXACT Bus encoding is

compatible with Common Serialization

(SERDES) devices to allow serial

extension using coax or twinax cable.

• Management interface connects to an

off-chip microprocessor for access to

internal control registers.

COMPATIBILITY

• Interworks with the following EXACT

Chipset devices:

PM3370 Octal 10/100 Ethernet Switch

Port Controller with MII interfaces.

PM3380 Gigabit Ethernet Switch Port

Controller.

PACKAGING

• Provides a standard five signal

P1149.1 JTAG test port for boundary

scan board test purposes.

• Implemented in low power 3.3 V,

CMOS technology.

• Available in a 352-pin Ball Grid Array

(BGA) package.

APPLICATIONS

• High Bandwidth (16 to 32 Gbit/s)

Ethernet Switches that Support

Combinations of 10/100/1000 Ports.

• Multiprotocol Switch (Ethernet, ATM,

Packet Over SONET, FDDI, and TR)

• Modular Ethernet Switches.

• Fixed-configuration Ethernet Switches.

BLOCK DIAGRAM

8

× EXACT

Input Ports

8

× EXACT

Output Ports

Control

Interface

Management

Interface

4 Port

Expansion

Interface

Free List

Manager

Cell List

Manager

XRXD[9:0]

XRCLK

Per Port

Signals

XTXD[9:0]

XTCLK

Per Port

Signals

Expansion

Contol

JTAG

EXACT

8 Input

Buffers

Pipelined

Data

Mux

Pipelined

Data

Mux

Cell

Central

Store

EXACT

8 Output

Buffers