AM7968-125DKC Advanced Micro Devices, AM7968-125DKC Datasheet - Page 5

• Manufacturer Part Number: AM7968-125DKC
• Description: TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
• Manufacturer: Advanced Micro Devices

Am7968/Am7969
TAXIchip
(Transparent Asynchronous Xmitter-Receiver Interface)
DISTINCTIVE CHARACTERISTICS
GENERAL DESCRIPTION
The Am7968 TAXIchip Transmitter and Am7969
TAXIchip Receiver Chipset is a general-purpose inter-
face for very high-speed (4–17.5 Mbyte/s, 40–175
Mbaud serially) point-to-point communications over co-
axial or fiber-optic media. The TAXIchip set emulates a
pseudo-parallel register. They load data into one side
and output it on the other, except in this case, the “other”
side is separated by a long serial link.
BLOCK DIAGRAM
Am7968
Note:
N can be 8, 9, or 10 bits; total of N + M = 12.
Data Mode Select (DMS)
— Eight Data and four Command Pins
— or nine Data and three Command Pins
— or ten Data and two Command Pins
— +5 V ECL Serial I/O
— AC or DC coupled
— NRZI 4B/5B, 5B/6B encoding/decoding
Test Serial In
Parallel TTL bus interface
Transparent synchronous serial link
Drive coaxial cable or twisted pair directly
Acknowledge (ACK
(TSERIN)
Strobe (STRB)
Clock (CLK)
FINAL
TM
Integrated Circuits
X2
X1
Serial Interface
Test/Local Select (TLS)
Acknowledge
Clock Gen.
Oscillator
Strobe &
and
Encoder Latch
Data Encoder
Data
Input Latch
Shifter
The speed of a TAXIchip system is adjustable over a
range of frequencies, with parallel bus transfer rates of
4 Mbyte/s at the low end, and up to 17.5 Mbyte/s at the
high end. The flexible bus interface scheme of the
TAXIchip set accepts bytes that are either 8, 9, or
10 bits wide. Byte transfers can be Data or Command
signaling.
N
Command
Easy interface with fiber optic data links
32–140 Mbps (4–17.5 Mbyte/s) data
throughput
Asynchronous input using STRB/ACK
Automatic MUX/DEMUX of Data and Command
Complete on-chip PLL, Crystal Oscillator
Single +5 V supply operation
28-pin PLCC or DIP or LCC
M
Interface
Media
Publication# 07370
Issue Date: April 1994
(SEROUT+) Serial Out +
(SEROUT–) Serial Out –
Rev. F
Advanced
Devices
Amendment /0
Micro
07370F-1