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cPCI-MXS64GX Technical Reference Manual
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)
A15
B15
C15
D15
E16
B17
D17
A18
E17
C17
A17
D16
C16
B16
A16
E15
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.
Standard Mode
SLCT
PE
BUSY
/ACK
/SLCTIN
/INIT
/ERR
ALF
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
EPP Mode
-
-
WAIT
/INTR
/ADDRSTRB
-
-
DATASTB
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
2.6
ECP Mode
SLCT
PERROR
, ACKREVERS
1
2
BUSY
, PERIPHACK
1
2
/ACK
/SLCTIN
/INIT
, /REVERSERQST
1
2
/FAULT
, /PERIPHRQST
1
2
ALF
, HOSTACK
1
2
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
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