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