CY7C9689A
TAXI™-compatible HOTLink
®
Transceiver
Features
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Second-generation HOTLink
®
technology
AMD™ AM7968/7969 TAXIchip™-compatible
8-bit 4B/5B or 10-bit 5B/6B NRZI encoded data transport
10-bit or 12-bit NRZI pre-encoded (bypass) data transport
Synchronous TTL parallel interface
Embedded/bypassable 256-character Transmit and
Receive FIFOs
50- to 200-MBaud serial signaling rate
Internal phase-locked loops (PLLs) with no external PLL
components
Dual differential PECL-compatible serial inputs and outputs
Compatible with fiber-optic modules and copper cables
Built-In Self-Test (BIST) for link testing
Link Quality Indicator
Single +5.0V ±10%supply
100-pin TQFP
Pb-Free package option available
FIFO and is encoded using embedded 4B/5B or 5B/6B
encoders to improve its serial transmission characteristics.
These encoded characters are then serialized, converted to
NRZI, and output from two PECL-compatible differential trans-
mission line drivers at a bit-rate of either 10 or 20 times the
input reference clock in 8-bit (or 10-bit bypass) mode, or 12 or
24 times the reference clock in 10-bit (or 12-bit bypass) mode.
The receive section of the CY7C9689A HOTLink accepts a
serial bit-stream from one of two PECL compatible differential
line receivers and, using a completely integrated PLL Clock
Synchronizer, recovers the timing information necessary for
data reconstruction. The recovered bit stream is converted
from NRZI to NRZ, deserialized, framed into characters,
4B/5B or 5B/6B decoded, and checked for transmission
errors. The recovered 8- or 10-bit decoded characters are then
written to an internal Receive FIFO, and presented to the
destination host system.
The integrated 4B/5B and 5B/6B encoder/decoder may be
bypassed (disabled) for systems that present externally
encoded or scrambled data at the parallel interface. With the
encoder bypassed, the pre-encoded parallel data stream is
converted to and from a serial NRZI stream. The embedded
FIFOs may also be bypassed (disabled) to create a
reference-locked serial transmission link. For those systems
requiring even greater FIFO storage capability, external FIFOs
may be directly coupled to the CY7C9689A through the
parallel interface without the need for additional glue-logic.
The TTL parallel I/O interface may be configured as either a
FIFO (configurable for depth expansion through external
FIFOs) or as a pipeline register extender. The FIFO configura-
tions are optimized for transport of time-independent
(asynchronous) 8- or 10-bit character-oriented data across a
link. A Built-In Self-Test (BIST) pattern generator and checker
allows for testing of the high-speed serial data paths in both
the transmit and receive sections, and across the intercon-
necting links.
HOTLink devices are ideal for a variety of applications where
parallel interfaces can be replaced with high-speed,
point-to-point serial links. Some applications include intercon-
necting workstations, backplanes, servers, mass storage, and
video transmission equipment.
Functional Description
The CY7C9689A HOTLink Transceiver is a point-to-point
communications building block allowing the transfer of data
over high-speed serial links (optical fiber, balanced, and unbal-
anced copper transmission lines) at speeds ranging between
50 and 200 MBaud. The transmit section accepts parallel data
of selectable widths and converts it to serial data, while the
receiver section accepts serial data and converts it to parallel
data of selectable widths.
Figure 1
illustrates typical connec-
tions between two independent host systems and corre-
sponding CY7C9689A parts. The CY7C9689A provides
enhanced technology, increased functionality, a higher level of
integration, higher data rates, and lower power dissipation
over the AMD AM7968/7969 TAXIchip products.
The transmit section of the CY7C9689A HOTLink can be
configured to accept either 8- or 10-bit data characters on each
clock cycle, and stores the parallel data into an internal
synchronous Transmit FIFO. Data is read from the Transmit
Figure 1. HOTLink System Connections
Decoder
4B/5B, 5B/6B
Encoder
4B/5B, 5B/6B
Framer
Deserializer
Serializer
FIFO
Receive
Data
Receive
System Host
Control
Status
Serial Link
Transmit
FIFO
Transmit
Data
System Host
CY7C9689A
Encoder
4B/5B, 5B/6B
Serializer
FIFO
Transmit
CY7C9689A
Decoder
4B/5B, 5B/6B
Deserializer
Framer
Receive
FIFO
Control
Status
Receive
Data
Data
Transmit
Serial Link
Cypress Semiconductor Corporation
Document #: 38-02020 Rev. *D
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198 Champion Court
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San Jose
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CA 95134-1709
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408-943-2600
Revised September 29, 2006
CYPRESS [ CYPRESS SEMICONDUCTOR ]
