W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 57

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

5.2.6 Bit Map of Parallel Port and EPP Registers
5.2.7 EPP Pin Descriptions
Data Port (R/W)
Status Buffer (Read)
Control Swapper (Read)
Control Latch (Write)
EPP Address Port
(R/W)
EPP Data Port 0 (R/W)
EPP Data Port 1 (R/W)
EPP Data Port 2 (R/W)
EPP Data Port 3 (R/W)
nWrite
PD<0:7>
Intr
nWait
PE
Select
nDStrb
nError
nInits
nAStrb
EPP NAME
REGISTER
TYPE
I/O
O
O
O
O
I
I
I
I
I
Denotes an address or data read or write operation.
Bi-directional EPP address and data bus.
Used by peripheral device to interrupt the host.
Inactive to acknowledge that data transfer is completed. Active to
indicate that the device is ready for the next transfer.
Paper end; same as SPP mode.
Printer selected status; same as SPP mode.
This signal is active low. It denotes a data read or write operation.
Error; same as SPP mode.
This signal is active low. When it is active, the EPP device is reset to its
initial operating mode.
This signal is active low. It denotes an address read or write operation.
BUSY
PD7
PD7
PD7
PD7
PD7
PD7
7
1
1
ACK
PD6
PD6
PD6
PD6
PD6
PD6
6
1
1
PD5
PD5
PD5
PD5
PD5
PD5
DIR
PE
- 57 -
5
1
IRQEN
SLCT
PD4
PD4
PD4
PD4
PD4
PD4
EPP DESCRIPTION
IRQ
4
ERROR
SLIN
SLIN
PD3
PD3
PD3
PD3
PD3
PD3
Publication Release Date: January 1996
3
PD2
PD2
PD2
PD2
PD2
PD2
INIT
INIT
2
1
AUTOFD
AUTOFD
PD1
PD1
PD1
PD1
PD1
PD1
1
1
W83877F
Revision A2
TMOUT
STROBE
STROBE
PD0
PD0
PD0
PD0
PD0
PD0
0