Kontron cPCI-DMXS64GX, Technical Reference Manual

Page: 31 / 139

cPCI-DMXS64GX Technical Reference Manual
2.6
The differences between Standard, EPP, and ECP modes appear in the signal assignation of
the pins on the connector. Differences are described as follows:
Pin Number (J5)
Standard Mode EPP Mode ECP Mode
A15 SLCT
-
SLCT
B15 PE
-
PERROR
1
, ACKREVERS
2
C15 BUSY
WAIT
BUSY
1
, PERIPHACK
2
D15 /ACK
/INTR
/ACK
E16 /SLCTIN /ADDRSTRB
/SLCTIN
B17 /INIT
-
/INIT
1
, /REVERSERQST
2
D17 /ERR
-
/FAULT
1
, /PERIPHRQST
2
A18 ALF
DATASTB
ALF
1
, HOSTACK
2
E17 PD0 PD0 PD0
C17 PD1 PD1 PD1
A17 PD2 PD2 PD2
D16 PD3 PD3 PD3
C16 PD4 PD4 PD4
B16 PD5 PD5 PD5
A16 PD6 PD6 PD6
E15 PD7 PD7 PD7
1
Compatible mode
2
High Speed Mode
✎
NOTE
To operate in EPP or ECP mode, ensure the peripheral is designed to
work in this mode and the BIOS setup is configured to support it.
2.6.1. Standard Mode
The Standard mode is unidirectional. It is supported to maintain the compatibility with the
IBM PC standard.
2.6.2. EPP Mode
The EPP (Enhanced Parallel Port) mode consists of a hardware independent method of
accessing a parallel port configured as EPP. It provides support for single I/O cycle as well
as the high performance block I/O transfers. The EPP mode always uses the most optimum
method for I/O transfers. For example, if the hardware supports it, EPP mode will perform
32-bit I/O block transfers.