W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 172

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

13.2.4 EPP Address Port
The address port is available only in EPP mode. Bit definitions are as follows:
The contents of DB0-DB7 are buffered (non-inverting) and output to ports PD0-PD7 during a write
operation. The leading edge of IOW# causes an EPP address write cycle to be performed, and the
trailing edge of IOW# latches the data for the duration of the EPP write cycle.
PD0-PD7 ports are read during a read operation. The leading edge of IOR# causes an EPP address
read cycle to be performed and the data to be output to the host CPU.
13.2.5 EPP Data Port 0-3
These four registers are available only in EPP mode. The bit definitions for each data port are the
same and as follows:
When any EPP data port is accessed, the contents of DB0-DB7 are buffered (non-inverting) and
output to ports PD0-PD7 during a write operation. The leading edge of IOW# causes an EPP data
write cycle to be performed, and the trailing edge of IOW# latches the data for the duration of the EPP
write cycle.
During a read operation, ports PD0-PD7 are read, and the leading edge of IOR# causes an EPP read
cycle to be performed and the data to be output to the host CPU.
13.2.6 EPP Pin Descriptions
13.2.7 EPP Operation
NWrite
PD<0:7>
Intr
NWait
PE
Select
NDStrb
Nerror
Ninits
NAStrb
EPP NAME
NAME
NAME
BIT
BIT
PD7
PD7
7
7
TYPE
I/O
O
O
O
O
I
I
I
I
I
Denotes read or write operation for address or data.
Bi-directional EPP address and data bus.
Used by peripheral devices to interrupt the host.
Inactivated to acknowledge that data transfer is complete. Activated to
indicate that the device is ready for the next transfer.
Paper end; same as SPP mode.
Printer-select 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.
PD6
PD6
6
6
PD5
PD5
5
5
W83627DHG-P/W83627DHG-PT
-162-
PD4
PD4
4
4
EPP DESCRIPTION
PD3
PD3
3
3
Publication Release Date: July 09, 2009
PD2
PD2
2
2
PD1
PD1
1
1
Version 1.94
PD0
PD0
0
0