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參數(shù)資料
型號: W83877AF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)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(shù): 93/171頁
文件大小: 1634K
代理商: W83877AF
W83877AF
Publication Release Date: Dec. 1996
Preliminary Version 0.52
- 91 -
5.2.6 Bit Map of Parallel Port and EPP Registers
REGISTER
7
6
5
4
3
2
1
0
Data Port (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Status Buffer (Read)
BUSY
ACK
PE
SLCT
ERROR
SLIN
1
1
TMOUT
Control Swapper (Read)
1
1
1
IRQEN
INIT
AUTOFD
STROBE
Control Latch (Write)
1
1
DIR
IRQ
SLIN
INIT
PD2
AUTOFD
PD1
STROBE
PD0
EPP Address Port
(R/W)
PD7
PD6
PD5
PD4
PD3
EPP Data Port 0 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 1 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 2 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 3 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
5.2.7 EPP Pin Descriptions
EPP NAME
TYPE
EPP DESCRIPTION
nWrite
O
Denotes an address or data read or write operation.
PD<0:7>
I/O
Bi-directional EPP address and data bus.
Intr
I
Used by peripheral device to interrupt the host.
nWait
I
Inactive to acknowledge that data transfer is completed. Active to
indicate that the device is ready for the next transfer.
PE
I
Paper end; same as SPP mode.
Select
I
Printer selected status; same as SPP mode.
nDStrb
O
This signal is active low. It denotes a data read or write operation.
nError
I
Error; same as SPP mode.
nInits
O
This signal is active low. When it is active, the EPP device is reset to its
initial operating mode.
nAStrb
O
This signal is active low. It denotes an address read or write operation.
5.2.8 EPP Operation
When the EPP mode is selected in the configuration register, the standard and bi-directional modes
are also available. The PDx bus is in the standard or bi-directional mode when no EPP read, write, or
address cycle is currently being executed. In this condition all output signals are set by the SPP
Control Port and the direction is controlled by DIR of the Control Port.
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