PMC PM8351 Datasheet

PMC-Sierra,Inc.
8-Channel 1.0-1.25 Gbps Transceiver
PM8351 OctalPHY™
FEATURES
• Eight independent 1.0-1.25 Gbit/s transceivers
• Ultra low power operation: 1.25 Watts typical
• Integrated serializ er/dese rializ er, cloc k synthesis, clock recovery , and 8B/10B encode/decode logic
• Physical Coding Sublayer (PCS) logic for Gigabit Ethernet
• Optional receive FIFO which synchronizes incoming data to local clock domain
• Dual Data Rate (DDR) parallel interface with cloc k forwarding to halve ASIC terminal count and simplify timing
• Extensive control of loopback, BIST, and operating modes via 802.3 compliant MDC/MDIO serial interface
• Built-in packet gener ator/ ch eck er
• “Trunking” feature to de-skew and align received para llel data across eight channels
• IEEE 1149.1 JTAG testing support
• IEEE 802.3z Gigabit Ethernet and ANSI X3T11 FibreChannel support
• High speed outputs which feature programmable output cur rent to directly drive dual-terminated line
• 2.5 V, 0.25 µ CMOS technology w ith
3.3V tolerant I/O
• Direct interface to optical modules, coax, or serial backplanes
• Small footprint 19x19 mm, 289-pin PBGA
APPLICATIONS
• High speed serial backplanes
• Gigabit Ethernet links
• FibreChannel links
• Intra-system interconnect
• ASIC to PMD link
GENERAL DESCRIPTION
The OctalPHYTM is an octal PHYsical layer transceiver ideal for systems requiring large numbers of po int-to-point gigabit links. It provides eight individual serial channels capable of operation at up to 1.25 Gbps, which may be grouped together to form a single 12.5 Gbps bidirectional link.
The OctalPHY includes 8B/10B block coding logic (compliant with 802.3z Gigabit Ethernet and FibreChannel requirements) which produces run length limited data streams for serial trans­mission.
A receive FIFO optionally aligns all incoming parallel data to the local clock domain, adding or removing IDLE sequences as require d. This simp lifies implementation of the upstream ASIC by removing the requirement to deal with multiple clock domains.
When trunking is enable d, t he OctalPH Y can remove cable skew differences equivalent to several meters, presenting 8-byte data vectors at the receive interface exactly as they were trans­mitted.
EXAMPLE ARCHITECTURE
The first figure on the next page shows the OctalPHY in a switch application. This implementat ion uses eight ch annels of 1.25 Gbaud per linecard, requiring only 32 signal pins per linecard and 128 for the switch card, providing up to 32 Gbps total payload capacity to the switch fabric.
The 5-bit DDR interface of the OctalPHY saves pins on the switch device. An additional OctalPH Y operated in trunkin g mode creates a cost effective 10 Gbps uplink, capable of directly driving copper or various optical transports.
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 OctalPHY bridges these domains so that the switch fabric and linecards ma y b e designed in only a single clock domain .
The OctalPHY creates a highly integrated and cost effective physical layer solution for Gigabit Ethernet or FibreChannel external interfaces.
BLOCK DIAGRAM
Transmit Channel A (1 of 8)
Parallel Data In
TX Byte Clock
Parallel Data Out
RX Byte Clock
REFCLK
PMC-2000672 (R3) PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS INTERNAL USE © Copyright PMC-Sierra, Inc. 2001
FIFO
FIFO
Clock Synthesizer
PLL LOCK
PCS
Receive Channel A (1 of 8)
PCS
10B/8B Decoder
8B/10B Encoder
10
10
Deserialize &
Byte Align
MDC/MDIO Serial Management Static Controls
Serializer
Clock
Recovery
Common Control Logic
Serial Transmit Data
Serial Receive Data
8-Channel 1.0-1.25 Gbps Transceiver
32 GBPS SWITCH APPLICATION
Switch Card
PM8351 PM8351
Serial Point-to-point Backplane: 8Gbps Per line card
PM8351 PM8351
Switch clock domain
PM8351 OctalPHY
Line Card
PM8351 PM8351 PM8351 PM8351
Line card clock domain
MAC/Packet processor MAC/Packet processor MAC/Packet processor
MAC/Packet processor
RX data clock domains
PM8351
Uplink clock domain
PM8351
EYE DIAGRAM
Produced by the OctalPHY when driving a 50 Ohm cable, terminated at both near and far ends.
JITTER
Jitter histogram of the OctalPHY showing 6.8 picoseconds, 1 σ jitter with all channels operating.
Gigabit Ethernet or Fibre Channel Interfaces
10 Gbps (trunked) uplink
Head Office: PMC-Sierra, Inc. 8555 Baxter Place Burnaby, B.C. V5A 4V7 Canada Tel: 604.415.6000 Fax: 604.415.6200
100.0 ps/div
To order documentation, send email to: document@pmc-sierra.com or contact the head office, Attn: Document Coordinator
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS INTERNAL USE
All product documentation is available on our web site at: http://www.pmc-sierra.com For corpo rate information, send email to: info@pmc-sierra.com
© Copyrigh t PMC-Sierra, Inc. 2001. All rights reserved. SATURN and S/UNI are registered trademarks of PMC-Sierra, Inc. POS-PHY Level 3 is a trademark of PMC-Sierra, Inc.
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