Configuration
CP307
Page 4 - 12
ID 34424, Rev. 3.0
P R E L I M I N A R Y
4.5.4
I/O Status Register
The I/O Status Register describes the CompactPCI, the Rear I/O and the local control signals.
The Rear I/O configuration is shown by the bits RCFG[1:0]. To indicate the active Firmware
Hub, the FSTA[1:0] bits are used. The CSLOT bit reflects the kind of slot in which the CP307
is plugged in. The fail signal is an output of the power supply and indicates a power supply
failure. For the description of the derate and enumeration signals, please refer to the Board
Interrupt Configuration Register (0x289).
Table 4-9:
I/O Status Register
REGISTER NAME
I/O STATUS REGISTER
SIZE
ADDRESS
0x286
8 bits
BIT POSITION
MSB
7
6
5
4
3
2
1
0
LSB
CONTENT
RCFG1
RCFG0
FSTA1
FSTA0
CSLOT
CENUM
CFAIL
CDER
DEFAULT
--
--
0
0
0
0
0
0
ACCESS
R
R
R
R
R
R
R
R
BIT
NAME
DESCRIPTION / FUNCTION
7 - 6
RCFG[1:0] These bits indicate the Rear I/O configuration:
00 Rear I/O disabled
01 COM1, GPIO
10 Reserved
11 COM1, COM2
The default value of these bits depends on the CP307 version ordered (front or rear I/O)
and on the Rear I/O module, if used.
5 - 4
FSTA[1:0]
These bits indicate the active BIOS Firmware Hub Flash status:
00 BIOS boot from FWH0
01 Reserved
10 BIOS boot from external FWH on the CP307-HDD module
11 Reserved
3
CSLOT
0 Installed in a system slot
1 Installed in a peripheral slot
2
CENUM
0 Indicates the insertion or removal of a hot swap system board (CPCI ENUM)
1 No hot swap event
1
CFAIL
0 Power supply failure (CPCI FAIL signal)
1 Power normal
0
CDER
0 Power derating (CPCI DEG signal)
1 Power normal
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