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參數(shù)資料
| 型號(hào)： | 37C669 |
| 廠商： | SMSC Corporation |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL |
| 中文描述： | 電腦98/99順從超級(jí)I / O軟盤控制器與紅外線支持 |
| 文件頁(yè)數(shù)： | 162/164頁(yè) |
| 文件大?。?/td> | 621K |
| 代理商： | 37C669 |
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97
ISA IMPLEMENTATION STANDARD
This specification describes the standard ISA
interface to the Extended Capabilities Port
(ECP).
All ISA devices supporting ECP must
meet the requirements contained in this section
or the port will not be supported by Microsoft.
For a description of the ECP Protocol, please
refer to the IEEE 1284 Extended Capabilities
Port Protocol and ISA Interface Standard, Rev.
1.09, Jan.7, 1993. This document is available
from Microsoft.
Description
The port is software and hardware compatible
with existing parallel ports so that it may be
used as a standard LPT port if ECP is not
required. The port is designed to be simple and
requires a small number of gates to implement.
It does not do any "protocol" negotiation, rather
it provides an automatic high burst-bandwidth
channel that supports DMA for ECP in both the
forward and reverse directions.
Small FIFOs are employed in both forward and
reverse directions to smooth data flow and
improve the maximum bandwidth requirement.
The size of the FIFO is 16 bytes deep. The port
supports
an
automatic
handshake
for
the
standard parallel port to improve compatibility
mode transfer speed.
The port also supports run length encoded
(RLE) decompression (required) in hardware.
Compression
is
accomplished
by
counting
identical bytes and transmitting an RLE byte
that indicates how many times the next byte is
to
be
repeated.
Decompression
simply
intercepts
the
RLE
byte
and
repeats
the
following byte the specified number of times.
Hardware support for compression is optional.
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