CP308 Configuration
ID 1027-4487, Rev. 3.0 Page 4 - 19
P R E L I M I N A R Y
4.3.16 General Purpose Input Register (GPIN)
The General Purpose Input Register holds the general purpose input signals of the rear I/O
CompactPCI connector J2. This register can be used only if the CP308 is ordered as a rear I/O
version and the rear I/O GPIO operation is configured through the dedicated rear I/O module
configuration signal on the CompactPCI J2 connector.
Table 4-19: General Purpose Input Register (GPIN)
REGISTER NAME GENERAL PURPOSE INPUT REGISTER (GPIN)
ADDRESS 0x293
BIT NAME DESCRIPTION
RESET
VALUE
ACCESS
7 - 5 Res. Reserved 000 R
4 GPI4 General purpose input 4 signal (3.3 V TTL):
0 = Input low
1 = Input high
1R
3 GPI3 General purpose input 3 signal (3.3 V TTL):
0 = Input low
1 = Input high
1R
2 GPI2 General purpose input 2 signal (3.3 V TTL):
0 = Input low
1 = Input high
1R
1 GPI1 General purpose input 1 signal (3.3 V TTL):
0 = Input low
1 = Input high
1R
0 GPI0 General purpose input 0 signal (3.3 V TTL):
0 = Input low
1 = Input high
1R
Note ...
The CP308 provides pull-up resistors on the rear I/O signal pins GPI[4:0], which
leads to the default setting “input high” if the inputs are not connected.
The general purpose inputs support 3.3 V TTL signaling only (not 5V friendly).
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