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85C30 PDF预览

85C30

更新时间: 2022-11-26 01:36:42
品牌 Logo 应用领域
超微 - AMD 通信控制器
页数 文件大小 规格书
68页 527K
描述
Enhanced Serial Communications Controller

85C30 数据手册

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FINAL  
Advanced  
Micro  
Am85C30  
Enhanced Serial Communications Controller  
Devices  
— Programmable CRC generators and checkers  
DISTINCTIVE CHARACTERISTICS  
— SDLC/HDLC support includes frame control,  
zero insertion and deletion, abort, and residue  
handling  
Fastest data rate of any Am8530  
— 8.192 MHz / 2.048 Mb/s  
— 10 MHz / 2.5 Mb/s  
Enhanced SCC functions support high-speed  
— 16.384 MHz / 4.096 Mb/s  
Low-power CMOS technology  
frame reception using DMA  
— 14-bit byte counter  
Pin and function compatible with other NMOS  
— 10 × 19 SDLC/HDLC Frame Status FIFO  
— Independent Control on both channels  
and CMOS 8530s  
Easily interfaced with most CPUs  
— Compatible with non-multiplexed bus  
Many enhancements over NMOS Am8530H  
— Enhanced operation does not allow special  
receive conditions to lock the 3-byte DATA  
FIFO when the 10 × 19 FIFO is enabled  
Local Loopback and Auto Echo modes  
— Allows Am85C30 to be used more effectively in  
high-speed applications  
Internal or external character synchronization  
2-Mb/s FM encoding transmit and receive  
capability using internal DPLL for 16.384-MHz  
product  
— Improves interface capabilities  
Two independent full-duplex serial channels  
Asynchronous mode features  
Internal synchronization between RxC to PCLK  
— Programmable stop bits, clock factor, character  
length and parity  
and TxC to PCLK  
— This allows the user to eliminate external syn-  
chronization hardware required by the NMOS  
device when transmitting or receiving data at  
the maximum rate of 1/4 PCLK frequency  
— Break detection/generation  
— Error detection for framing, overrun, and parity  
Synchronous mode features  
— Supports IBM BISYNC, SDLC, SDLC Loop,  
HDLC, and ADCCP Protocols  
GENERAL DESCRIPTION  
AMD’s Am85C30 is an enhanced pin-compatible ver-  
sion of the popular Am8530H Serial Communications  
Controller. The Enhanced Serial Communications  
Controller (ESCC) is a high-speed, low-power, multi-  
protocol communications peripheral designed for use  
with 8- and 16-bit microprocessors. It has two independ-  
ent,full-duplex channels and functions as a serial-to-  
parallel, parallel-to-serial converter/controller. AMD’s  
proprietary enhancements make the Am85C30 easier  
to interface and more effective in high-speed applica-  
tionsduetoareductioninsoftwareburdenandtheelimi-  
nation of the need for some external glue logic.  
generators, digital phase-locked loops, and crystal  
oscillators, which dramatically reduce the need for ex-  
ternal logic. The device can generate and check CRC  
codes in any SYNC mode, and can be programmed to  
check data integrity in various modes. The ESCC also  
has facilities for modem controls in both channels. Inap-  
plications where these controls are not needed, the mo-  
dem controls can be used for general-purpose I/O.  
This versatile device supports virtually any serial data  
transfer application such as networks, modems, cas-  
settes, and tape drivers. The ESCC is designed for non-  
multiplexed buses and is easily interfaced with most  
CPUs, such as 80188, 80186, 80286, 8080, Z80, 6800,  
68000 and MULTIBUS .  
The Am85C30 is easy to use due to a variety of sophisti-  
cated internal functions, including on-chip baud rate  
Publication# 10216 Rev. F Amendment/0  
Issue Date: June 1993  

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