CY7C9689
TAXI™ Compatible HOTLink® Transceiver
improve its serial transmission characteristics. These encoded
characters are then serialized, converted to NRZI, and output
from two PECL-compatible differential transmission line driv-
ers 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.
Features
• Second-generation HOTLink® technology
• AMD™ AM7968/7969 TAXIchip™ compatible
• 8-bit 4B/5B or 10-bit5B/6B NRZIencoded 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 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
The receive section of the CY7C9689 HOTLink accepts a se-
rial 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 by-
passed (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 seri-
al transmission link. For those systems requiring even greater
FIFO storage capability, external FIFOs may be directly cou-
pled to the CY7C9689 through the parallel interface without
the need for additional glue-logic.
Functional Description
The CY7C9689 HOTLink Transceiver is a point-to-point com-
munications 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 correspond-
ing CY7C9689 parts. The CY7C9689 provides enhanced
technology, increased functionality, a higher level of integra-
tion, higher data rates, and lower power dissipation over the
AMD AM7968/7969 TAXIchip products.
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 (asyn-
chronous) 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 trans-
mit and receive sections, and across the interconnecting 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 interconnecting
workstations, backplanes, servers, mass storage, and video
transmission equipment.
The transmit section of the CY7C9689 HOTLink can be con-
figured to accept either 8- or 10-bit data characters on each
clock cycle, and stores the parallel data into an internal syn-
chronous Transmit FIFO. Data is read from the Transmit FIFO
and is encoded using embedded 4B/5B or 5B/6B encoders to
Transmit
Data
Data
Receive
Serial Link
Control
Control
Status
CY7C9689
CY7C9689
Status
Serial Link
Data
Transmit
Receive
Data
Figure 1. HOTLink System Connections
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
June 14, 2000
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