cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 21

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

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