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PM73488-1 Datasheet, PDF (1/2 Pages) PMC-Sierra, Inc – 5 Gbit/s ATM Switch Fabric Element | |||
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PMC-Sierra,Inc.
Released
5 Gbit/s ATM Switch Fabric Element
FEATURES
SWITCHING ALGORITHM
⢠Supports blocking resolution in the
switch fabric.
⢠Guarantees a lower bound on switch
performance using a patented
randomization algorithm called Evil
Twin Switchingâ¢.
⢠Determines routes using specified bits
in the header (self-routing switch
fabric) for unicast traffic.
⢠Determines output groupings using a
lookup table for multicast traffic.
⢠Allows output ports to be combined in
groups of 1, 2, 4, 8, 16, or 32 for
unicast traffic.
⢠Allows output ports to be combined in
groups of 1, 2, or 4 for multicast traffic.
MULTICAST SUPPORT
⢠Supports optimal tree-based multicast
replication in the switch fabric.
⢠Supports 128 internal multicast
groups, expandable to 256 K with
external SRAM.
⢠Provides 64 internal cell buffers for
multicast cells.
DIAGNOSTIC/ROBUSTNESS
FEATURES
⢠Checks the header parity.
⢠Counts tagged cells.
⢠Checks for connectivity and stuck-at
faults on all switch fabric interconnects.
I/O FEATURES
⢠Provides 32 switch fabric interfaces
with integrated phase aligner clock
recovery circuitry.
⢠Provides a Start-Of-Cell (SOC) output
per four switch element interfaces.
⢠Provides an external 16-bit
Synchronous SRAM (SSRAM)
interface for multicast group
expansion.
PM73488
QSE
⢠Provides a demultiplexed address/data
CPU interface.
⢠Provides an IEEE 1149.1 (JTAG)
boundary scan test bus.
PHYSICAL CHARACTERISTICS
⢠3.3 V supply voltage.
⢠5 V tolerant inputs.
⢠596-pin Enhanced Plastic Ball Grid
Array (EPBGA) package.
⢠Operates from a single 66 MHz clock.
APPLICATIONS
⢠A 5 Gbit/s Switch
⢠A 10 Gbit/s Switch
⢠A 5 Gbit/s-to-20 Gbit/s Scalable Switch
Architecture
⢠A 2.4 Gbit/s-to-80 Gbit/s Scalable
Switch Architecture
⢠A 5 Gbit/s-to-320 Gbit/s Scalable
Switch Architecture
BLOCK DIAGRAM
External SSRAM
Backpressure/Ack Flow
To QRT/QSE
BP/ACK to
QRT/QSE
Phase Aligners
and
Receive SE_D_IN
and SE_SOC_IN
BP_ACK
Drivers
Microprocessor
Interface
Multicast
Path
Arbiter
Unicast Routing and
Distribution Path
Data
Drivers
Phase Aligners and
Receive
BP_ACK_IN
To QRT/QSE
BP/ACK from
QRT/QSE
JTAG
PMC-1980617 (R3)
© 2001PMC-Sierra, Inc.
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