PMC-Sierra,Inc.
PM8353 QuadPHY鈩?/div>
4-Channel 1.0-1.25 Gbps Transceiver
FEATURES
鈥?Four independent 1.0-1.25 Gbit/s
transceivers
鈥?Four secondary channels to support
channel redundancy
鈥?Ultra low power operation: 1.25 Watt
typical
鈥?Integrated serializer/deserializer, clock
synthesis, clock recovery, and 8B/10B
encode/decode logic
鈥?Physical Coding Sublayer (PCS) logic
for Gigabit Ethernet
鈥?Selectable 8-bit, 10-bit, or IEEE 802.3z
GMII parallel interface
鈥?Optional Receive FIFOs which
synchronize incoming data to local
clock domain
鈥?鈥淭runking鈥?feature to de-skew and
align received parallel data across four
channels
鈥?100-156 MHz Single Data Rate (SDR)
parallel transmit interface with clock
forwarding
鈥?100-125 MHz SDR parallel receive
interface
鈥?Extensive control of loopback, BIST,
and operating modes via 802.3
compliant MDC/MDIO serial interface
鈥?Built-in packet generator/checker
鈥?IEEE 1149.1 JTAG testing support
鈥?IEEE 802.3z Gigabit Ethernet and
ANSI X3T11 Fibre Channel support
鈥?High speed outputs which feature
programmable output current to
directly drive dual-terminated line
鈥?2.5V, 0.25 micron CMOS technology
with 3.3V tolerant I/O
鈥?Direct interface to optical modules,
coax, or serial backplanes
鈥?Small footprint 19x19 mm, 289-pin
PBGA
requirements) which produces run length
limited data streams for serial trans-
mission.
A receive FIFO optionally aligns all
incoming parallel data to the local clock
domain, adding or removing IDLE
sequences as required. This simplifies
implementation of the upstream ASIC by
removing the requirement to deal with
multiple clock domains.
When trunking is enabled, the QuadPHY
can remove cable skew differences
equivalent to several meters, presenting
4-byte data vectors at the receive
interface exactly as they were trans-
mitted.
APPLICATIONS
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
High speed serial backplanes
Gigabit Ethernet links
Fibre Channel links
Intra-system interconnect
ASIC to PMD link
EXAMPLE ARCHITECTURE
GENERAL DESCRIPTION
The QuadPHY
TM
is a Quad PHYsical
layer transceiver ideal for systems
requiring large numbers of point-to-point
gigabit links. It provides four individual
serial channels capable of operation at
up to 1.25 Gbps each, which may be
grouped together to form a single 5.0
Gbps bidirectional link. Each of the four
primary channels has a corresponding
secondary channel that can be enabled
via the MDC/MDIO serial interface.
The QuadPHY includes 8B/10B block
coding logic (compliant with 802.3z
Gigabit Ethernet and Fibre Channel
The first figure on the next page shows
the QuadPHY in a switch application.
This implementation uses four channels
of 1.25 Gbaud per linecard, requiring
only 16 signal pins per linecard and 64
for the switch card, providing up to
16 Gbps total payload capacity to the
switch fabric.
The dotted lines in the figure depict the
system clock domains. Note that even
though the recovered clock from any or
all serial links may be asynchronous to
the local clock, the QuadPHY bridges-
these domains so that the switch fabric
and linecards may be designed in only a
single clock domain.
BLOCK DIAGRAM
Transmit Channel A (1 of 4)
Parallel
Data In
FIFO
TX Byte
Clock
PCS
8B/10B
Encoder
10
Serializer
Serial
Transmit
Data
Receive Channel A (1 of 4)
Parallel
Data Out
10
FIFO
PCS
10B/8B
Decoder
Deserialize &
Byte Align
Clock
Recovery
Serial
Receive
Data
RX Byte
Clock
REFCLK
Clock Synthesizer
PLL LOCK
MDC/MDIO
Serial
Management
Common Control Logic
Static Controls
PMC-2000673 (R3)
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS鈥?INTERNAL USE
漏 Copyright PMC-Sierra, Inc. 2001
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