7 REGISTER DESCRIPTION
All registers are read/write except for the I.D. and Revision Register and Interrupt Status Register which
are read only. See the following bit definition tables for bit assignment information. The default state of
each bit after a power-up sequence or reset is listed in each bit description.
7.1
MEMORY ADDRESS POINTER (MAP)
Not a register
7
6
5
4
3
2
1
0
INCR
MAP6
MAP5
MAP4
MAP3
MAP2
MAP1
MAP0
7.1.1 INCREMENT(INCR)
Default = 1
Function:
Memory address pointer auto increment control
0 - MAP is not incremented automatically.
1 - Internal MAP is automatically incremented after each read or write.
7.1.2 MEMORY ADDRESS POINTER (MAP[6:0])
Default = 0000001
Function:
Memory address pointer (MAP). Sets the register address that will be read or written by the control
port.
7.2
CHIP I.D. AND REVISION REGISTER (ADDRESS 01H) (READ ONLY)
7
6
5
4
3
2
1
0
Chip_ID3
Chip_ID2
Chip_ID1
Chip_ID0
Rev_ID3
Rev_ID2
Rev_ID1
Rev_ID0
7.2.1 CHIP I.D. (CHIP_ID[3:0])
Default = 0000
Function:
I.D. code for the CS42438. Permanently set to 0000.
7.2.2 CHIP REVISION (REV_ID[3:0])
Default = 0001
Function:
CS42438 revision level. Revision A is coded as 0001.
42
DS646PP2
CIRRUS [ CIRRUS LOGIC ]
