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| 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： | 163/164页 |
| 文件大小： | 621K |
| 代理商： | 37C669 |
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98
Table 38 - ECP Pin Descriptions
NAME
TYPE
DESCRIPTION
nStrobe
O
During write operations nStrobe registers data or address into the slave
on the asserting edge (handshakes with Busy).
PData 7:0
I/O
Contains address or data or RLE data.
nAck
I
Indicates valid data driven by the peripheral when asserted. This signal
handshakes with nAutoFd in reverse.
PeriphAck (Busy)
I
This signal deasserts to indicate that the peripheral can accept data.
This signal handshakes with nStrobe in the forward direction. In the
reverse direction this signal indicates whether the data lines contain
ECP command information or data. The peripheral uses this signal to
flow control in the forward direction. It is an "interlocked" handshake
with nStrobe. PeriphAck also provides command information in the
reverse direction.
PError
(nAckReverse)
I
Used to acknowledge a change in the direction the transfer (asserted =
forward).
The peripheral drives this signal low to acknowledge
nReverseRequest.
It
is
an
"interlocked"
handshake
with
nReverseRequest. The host relies upon nAckReverse to determine
when it is permitted to drive the data bus.
Select
I
Indicates printer on line.
nAutoFd
(HostAck)
O
Requests a byte of data from the peripheral when asserted,
handshaking with nAck in the reverse direction. In the forward direction
this signal indicates whether the data lines contain ECP address or
data. The host drives this signal to flow control in the reverse direction.
It is an "interlocked" handshake with nAck. HostAck also provides
command information in the forward phase.
nFault
(nPeriphRequest)
I
Generates an error interrupt when asserted. This signal provides a
mechanism for peer-to-peer communication. This signal is valid only in
the forward direction.
During ECP Mode the peripheral is permitted
(but not required) to drive this pin low to request a reverse transfer. The
request is merely a "hint" to the host; the host has ultimate control over
the transfer direction. This signal would be typically used to generate
an interrupt to the host CPU.
nInit
O
Sets the transfer direction (asserted = reverse, deasserted = forward).
This pin is driven low to place the channel in the reverse direction. The
peripheral is only allowed to drive the bi-directional data bus while in
ECP Mode and HostAck is low and nSelectIn is high.
nSelectIn
O
Always deasserted in ECP mode.
相关PDF资料 |
PDF描述 |
|---|---|
| 37C672 | ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 37C67X | ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 37C957FR | ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS |
| 37FMA1-ABW31N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
| 37FML1-BEW31N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
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