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CYP15G0401DXA
PRELIMINARY
Document #: 38-02002 Rev. *B
Page 2 of 48
The transmit section of the CYP15G0401DXA Quad HOTLink
II consists of four byte-wide channels that can be operated
independently or bonded to form wider buses. Each channel
can accept either 8-bit data characters or pre-encoded 10-bit
transmission characters. Data characters are passed from the
Transmit Input Register to an embedded 8B/10B Encoder to
improve their serial transmission characteristics. These en-
coded characters are then serialized and output from dual
Positive ECL (PECL) compatible differential transmission-line
drivers at a bit-rate of either 10- or 20-times the input reference
clock.
The receive section of the CYP15G0401DXA Quad HOTLink
II consists of four byte-wide channels that can be operated
independently or synchronously bonded for greater band-
width. Each channel 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. Each re-
covered bit-stream is deserialized and framed into characters,
8B/10B decoded, and checked for transmission errors. Recov-
ered decoded characters are then written to an internal Elas-
ticity Buffer, and presented to the destination host system. The
integrated 8B/10B encoder/decoder may be bypassed for sys-
tems that present externally encoded or scrambled data at the
parallel interface.
CYP15G0401DXA Transceiver Logic Block Diagram
For those systems using buses wider than a single byte, the
four independent receive paths can be bonded together to al-
low synchronous delivery of data across a two-byte-wide (16-
bit) path, or across all four bytes (32-bit). Multiple
CYP15G0401DXA devices may be bonded together to provide
synchronous transport of buses wider than 32 bits.
The parallel I/O interface may be configured for numerous
forms of clocking to provide the highest flexibility in system
architecture. In additional to clocking the transmit path inter-
faces from one or multiple sources, the receive interface may
be configured to present data relative to a recovered clock
(output) or to a local reference clock (input).
Each transmit and receive channel contains independent
Built-In Self-Test (BIST) pattern generators and checkers. This
BIST hardware allows at-speed testing of the high-speed se-
rial data paths in each transmit and receive section, and
across the interconnecting links.
HOTLink-II 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.
x10
Serializer
Phase
Align
Buffer
Encoder
8B/10B
Decoder
8B/10B
x11
Framer
Deserializer
TX
RX
x10
Serializer
Encoder
8B/10B
Decoder
8B/10B
x11
Framer
Deserializer
TX
RX
x10
Serializer
Encoder
8B/10B
Decoder
8B/10B
x11
Framer
Deserializer
TX
RX
x10
Serializer
Encoder
8B/10B
Decoder
8B/10B
x11
Framer
Deserializer
TX
RX
T
R
T
R
T
R
T
R
O
A
±
O
±
I
±
I
±
O
±
O
±
I
±
I
±
O
±
O
±
I
±
I
±
O
±
O
±
I
±
I
±
Phase
Align
Buffer
Phase
Align
Buffer
Phase
Align
Buffer
Elasticity
Buffer
Elasticity
Buffer
Elasticity
Buffer
Elasticity
Buffer
T
R
T
R
T
R
T
R