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| 型號： | 21921 |
| 英文描述： | Low-Frequency, Spread-Spectrum EconOscillator |
| 中文描述： | 接口1 Am186CC通信控制器到AMD斯坦福線性加速器中心設(shè)備使用增強(qiáng)的小型工業(yè)應(yīng)用筆記？ 57.1KB（PDF格式） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 57K |
| 代理商： | 21921 |
Publication#
21921
Issue Date:
June 1998
Rev:
A
Amendment/
0
This document contains information on a product under development at Advanced Micro Devices.
The information is intended to help you evaluate this product. AMD reserves the right to change or
discontinue work on this proposed product without notice.
Interfacing the Am186
CC Communications
Controller to an AMD
SLAC
Device Using
Enhanced SSI
Application Note
by Jeff Kirk
The purpose of this application note is to describe how to interface an Am186CC communications
controller to a Quad Subscriber Line Audio
-
Processing Circuit (QSLAC) device. The same tech-
niques can be used to interface an Am186CC controller to any SLAC
device.
BACKGROUND
Traditionally, linecards—if they had processors at all—
used simple, inexpensive 8-bit microcontrollers.
However, as the number of lines per card
increases,16-bit controllers such as the Am186CC
controller become more attractive for several reasons:
n
16-bit controller costs have decreased
n
More peripheral functions can be integrated,
reducing external component counts
n
Smaller packaging options are now available
n
16-bit controllers generally offer larger address
spaces
These factors, combined with the availability of
superior, low-cost development tools such as the
Microsoft
and Borland C compilers, reduce the time to
market and long-term maintenance costs.
The Am186CC controller also offers several new
features useful in communication systems:
n
Mixed 8- and 16-bit memory/peripheral spaces
n
Programmable I/Os with dedicated set/clear
functions
n
High-speed High-level Data Link Control (HDLC)
ports (10 Mbit/s)
n
Direct Pulse Code Modulation (PCM) Highway
interfaces
PCM interfaces—up to four each—provide simple
processor access to data on the SLAC device’s PCM
interface. Also, one of the Am186CC controller’s HDLC
ports, Channel A, supports General Circuit Interface
(GCI) operation. GCI is also known as the ISDN
Oriented Modular Interface, Revision 2 (IOM-2).
A SLAC device connects to its host processor through
a three-pin serial interface. While this interface is used
primarily to initialize the SLAC device, several critical
functions of the Subscriber Line Interface Circuit (SLIC)
can be monitored through the serial interface. As a
result, it may be necessary to make the interface as
fast as possible. Designed to drive the SLAC device’s
Microprocessor Interface (MPI) bus, the SSI port of the
Am186CC controller makes it even easier for the
hardware and software engineer to implement the
fastest possible interface.
FURTHER REFERENCES
The remainder of this application note assumes at least
a passing familiarity with the chips involved: the
Am186CC controller and the Am79Q02 QSLAC
device. If further details are needed, the following
literature is available from AMD:
Am186CC Communications Controller Data Sheet,
order #21915
Am186CC Communications Controller User's
Manual,
order #21914
Am186CC Communications Controller Register Set
Manual,
order #21916
Am186 and Am188 Family Instruction Set Manual,
order #21267
Am79Q02/021/031 QSLAC Data Sheet,
order #18503
AMD’s complete family of linecard devices is found in
the
Linecard Products for the Public Infrastructure
Market Data Book,
order #18503.
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