Interfaces and Connectors
EBX-41 Reference Manual
54
Bit
Mnemonic
Description
D2-D0
SS(2:0)
SPI Slave Select
–
These bits select which slave select will be asserted. The
SSx# pin on the baseboard will be directly controlled by these bits when
MAN_SS = 1. There are two sets of definitions which depend on the state of
the
ADIOMODE
bit in the Miscellaneous Control Register (
MISCCON
).
ADIOMODE
= 0 (default mode)
SS2 SS1 SS0 Slave Select
0
0
0
None, port disabled
0
0
1
SPX Slave Select 0, J28 pin-8
0
1
0
SPX Slave Select 1, J28 pin-9
0
1
1
SPX Slave Select 2, J28 pin-10
1
0
0
SPX Slave Select 3, J28 pin-11
1
0
1
A/D Converter Channels 1-8 (on-board
U34
)
1
1
0
Digital I/O Channels 1-32 (on-board
U22
,
U51
)
1
1
1
D/A Converter Channels 1-4 (on-board
U26
)
ADIOMODE
= 1
SS2 SS1 SS0 Slave Select
0
0
0
Same as for ADIOMODE = 0
0
0
1
SUMIT SPI I/F Chip Select 0, J14 pin-16
0
1
0
SUMIT SPI I/F Chip Select 1, J14 pin-18
0
1
1
A/D Converter Channels 9-16 (on-board
U56
)
1
0
0
D/A Converter Channels 5-8 (on-board
U31
)
1
0
1
Same as for ADIOMODE = 0
1
1
0
Same as for ADIOMODE = 0
1
1
1
Same as for ADIOMODE = 0
