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參數資料
型號: W83877AF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數: 101/171頁
文件大小: 1634K
代理商: W83877AF
W83877AF
Publication Release Date: Dec. 1996
Preliminary Version 0.52
- 99 -
5.3.12 ECP Pin Descriptions
NAME
TYPE
DESCRIPTION
nStrobe (HostClk)
O
The nStrobe registers data or address into the slave on the
asserting edge during write operations. This signal
handshakes with Busy.
PD<7:0>
I/O
These signals contains address or data or RLE data.
nAck (PeriphClk)
I
This signal indicates valid data driven by the peripheral when
asserted. This signal handshakes with nAutofd in reverse.
Busy (PeriphAck)
I
This signal deasserts to indicate that the peripheral can
accept data. It indicates whether the data lines contain ECP
command information or data in the reverse direction. When
in reverse direction, normal data are transferred when Busy
(PeriphAck) is high and an 8-bit command is transferred when
it is low.
PError (nAckReverse)
I
This signal is used to acknowledge a change in the direction
of the transfer (asserted = forward). The peripheral drives this
signal low to acknowledge nReverseRequest. The host relies
upon nAckReverse to determine when it is permitted to drive
the data bus.
Select (Xflag)
I
Indicates printer on line.
nAutoFd (HostAck)
O
Requests a byte of data from the peripheral when it is
asserted. This signal indicates whether the data lines contain
ECP address or data in the forward direction. When in forward
direction, normal data are transferred when nAutoFd
(HostAck) is high and an 8-bit command is transferred when it
is low.
nFault (nPeriphRequest)
I
Generates an error interrupt when it is asserted. This signal is
valid only in the forward direction. The peripheral is permitted
(but not required) to drive this pin low to request a reverse
transfer during ECP Mode.
nInit (nReverseRequest)
O
This signal sets the transfer direction (asserted = reverse,
deasserted = forward). This pin is driven low to place the
channel in the reverse direction.
nSelectIn (ECPMode)
O
This signal is always deasserted in ECP mode.
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W83877ATD 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F
W83877ATF 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F
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W83877TD 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
W83877TF 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O