CY7C924DX
200-MBaud HOTLink® Transceiver
The transmit section of the CY7C924DX 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 Trans-
mit FIFO. Data is read from the Transmit FIFO and is encoded
using an embedded 8B/10B encoder to improve its serial
transmission characteristics. These encoded characters are
then serialized and output from two Positive ECL (PECL) com-
patible differential transmission line drivers at a bit-rate of 10
times the input reference clock.
Features
• Second-generation HOTLink® technology
• Fibre Channel and ESCON® compliant 8B/10B
encoder/decoder
• 10- or 12-bit pre-encoded data path (raw mode)
• 8- or 10-bit encoded data transport (using 8B/10B
coding)
• Parity check/generate
The receive section of the CY7C924DX 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 deserialized
and framed into characters, 8B/10B decoded, and checked for
transmission errors. Recovered decoded characters are re-
constructed into either 8- or 10-bit data characters, written to
an internal Receive FIFO, and presented to the destination
host system.
• Synchronous or asynchronous TTL parallel interface
• UTOPIA compatible host bus interface
• Embedded/Bypassable 256-character synchronous
FIFOs
• Integrated support for daisy-chain and ring topologies
• Domain or individual destination device addressing
• 50- to 200-MBaud serial signaling rate
• Internal PLLs with no external PLL components
• Dual differential PECL serial inputs
The integrated 8B/10B encoder/decoder may be bypassed for
systems that present externally encoded or scrambled data at
the parallel interface. The embedded FIFOs may also be by-
passed to create a reference-locked serial transmission link.
For those systems requiring even greater FIFO storage capa-
bility, external FIFOs may be directly coupled to the
CY7C924DX device through the parallel interface without ad-
ditional glue-logic.
• Dual differential PECL serial 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
0.35 CMOS technology
•
µ
The TTL parallel I/O interface may be configured as either a
FIFO (configurable for UTOPIA emulation or for depth expan-
sion through external FIFOs) or as a pipeline register extender.
The FIFO configurations 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 permits at-speed testing of the high-speed serial
data paths in both the transmit and receive sections, and
across the interconnecting links.
Functional Description
The 200-MBaud CY7C924DX HOTLink Transceiver is a point-
to-point communications building block allowing the transfer of
data over high-speed serial links (optical fiber, balanced, and
unbalanced copper transmission lines) at speeds ranging be-
tween 50 and 200 MBaud. The transmit section accepts par-
allel data of selectable width and converts it to serial data,
while the receiver section accepts serial data and converts it
to parallel data of selectable width. Figure 1 illustrates typical
connections between two independent host systems and cor-
responding CY7C924DX parts. As a second generation
HOTLink device, the CY7C924DX provides enhanced levels of
technology, functionality, and integration over the field-proven
CY7B923/933 HOTLink.
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.
Transmit
Data
Data
Receive
Serial Link
Control
Control
Status
CY7C924DX
CY7C924DX
Status
Serial Link
Data
Transmit
Receive
Data
Figure 1. HOTLink System Connections
HOTLink is a registered trademark of Cypress Semiconductor Corporation.
ESCON and IBM are registered trademarks of International Business Machines.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
June 14, 2000
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