TAXI™-compatible HOTLink Transceiver
CY7C9689A
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
, CA 95134
•
408-943-2600
Document #: 38-02020 Rev. *C
Revised November 7, 2002
Features
• 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
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
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.
Figure 1. HOTLink System Connections
CY7C9689A
Receive
Data
Transmit
Data
Control
Status
CY7C9689A
Receive
Data
Transmit
Data
Control
Status
Serial Link
Serial Link
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