参数资料
型号: 37C669
厂商: 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: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 162/164页
文件大小: 621K
代理商: 37C669
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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相关代理商/技术参数
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37C672 制造商:SMSC 制造商全称:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C67X 制造商:SMSC 制造商全称:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C-6BH-5-5 制造商:Birtcher Products 功能描述:
37C72U-185 制造商:White-Rodgers 功能描述:
37C73U-170 制造商:White-Rodgers 功能描述: