CS4237B Datasheet, PDF (21/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
BYTE
1
2
3
4
5
6
7
8
9
10*
11*
12*
13*
14*
15*
16*
17
18*
19
20
21
22
23
Default
55h
BBh
00h
DDh
00h
03h
80h
00h
0Bh
20h
04h
08h
10h
80h
00h
00h
00h
48h
75h
B9h
FCh
10h
03h
Description
E²PROM validation byte 1.
The first two bytes tell the Crystal Codec that the E²PROM exists.
E²PROM validation byte 2
High byte for length of resource data in E²PROM
Low byte for length of resource data in E²PROM
Alternate CDROM (Logical Device 4), ACDbase, Address length mask
Modem (Logical Device 5), COMbase, Address length mask
Misc. Configuration Bits: Interrupt Pin Polarities, Key Disables, VCEN, & LD4 features
Global Configuration Bits: IFM, VCF1 and VCF0, WTEN, SPS
Code Base Byte - Must be 0x0B
RESERVED - Must be 0x20
RESERVED - Must be 0x04
RESERVED - Must be 0x08
RESERVED - Must be 0x10
RESERVED - Must be 0x80
RESERVED - Must be 0x00
RESERVED - Must be 0x00
External Peripheral Port I/O Decode Address Length 00 = 4 bytes, 08 = 8 bytes
08h causes XCTL0/XA2 pin to change to peripheral port address bit XA2.
RESERVED - Must be 0x48
IRQ A/B Selection: Lower nibble = A, Upper nibble = B.
Along with next two bytes - specify hardware interrupts tied to IRQA-IRQF pins
IRQ C/D Selection: Lower nibble = C, Upper nibble = D.
IRQ E/F Selection: Lower nibble = E, Upper nibble = F.
DMA A/B Selection: Lower nibble = A, Upper nibble = B.
This byte and the next byte - specify hardware DRQ/DACKs tied to the DMAA-DMAC pins
DMA C Selection: Lower nibble = C, Upper nibble = reserved (must be 0).
NOTE:The first four bytes are exclusive to the E²PROM and are not used in the Hostload mode.
* Currently not supported. Must be set to default values given in the table.
Table 2. Hardware Configuration Data
DS213PP4
21