cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 17

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

The next 3 bytes are the PnP version number.
The default is version 1.0a: 0Ah, 10h, 01h.
The next sequence of bytes are the ANSI identi-
fier string. The default is: 82h, 0Eh, 00h,
’Crystal Codec’, 00h.
The logical device data must be entered using
the PnP ISA Specification format. Typical logical
device values are found in Table 1. The
E
pendix A.
Loading Resource Data
A serial E
mable serial number and resource data to be
stored in an external E
compatible with devices from a number of ven-
dors and the size may vary according to specific
customer requirements. The maximum size for
resource data supported by the part’s internal
RAM is 384 bytes of combined Hardware Con-
figuration and PnP resource data. With the
addition of the 4-byte header, the maximum
amount of E
bytes. However, the part also supports firmware
upgrades via the E
E
the existence of an E
ing the first two bytes from the E
interface. If the data from the E
reads 55h and BBh, then the rest of the
E
If the first two bytes aren’t correct, the E
is assumed not to exist and a "hostload" proce-
dure must be used to load the internal RAM. The
Hostload procedure can be found in the Hostload
section. For motherboard designs, an E
should still be included, to allow faster integrat-
ing of resource and firmware patch data. This
allows updates without respiring BIOS code. If
the part is installed on a plug-in card, then an
external E
proper PnP resource data is loaded into the inter-
nal RAM prior to a PnP sequence. See the
DS213PP4
2
2
2
PROM version for this data is found in Ap-
PROM supported is 2k bytes. After power-up,
PROM data is loaded into the internal RAM.
2
2
PROM interface allows user-program-
PROM is required to ensure that the
2
PROM space used would be 388
2
PROM. The maximum size
2
PROM is checked by read-
2
PROM. The interface is
2
PROM port
2
2
2
PROM
PROM
PROM
External E
on the serial E
programming.
The format for the data stored in the E
as follows:
A typical E
mat, can be found in Appendix A.
Loading Firmware Patch Data
An external E
up sequence that stores Hardware Configuration
and PnP data, and firmware patch data. The part
contains RAM and ROM to run the core proces-
(Hardware Configuration Data:)
(Plug and Play Resource Data:)
2 bytes E
2 bytes length of resource data in E
19 bytes Hardware Configuration
9 bytes Plug and Play ID
3 bytes Plug and Play version number
Variable number of bytes of user defined
Logical Device 0 (Windows Sound System,
Logical Device 1 ( Game Port) data
Logical Device 2 ( Control) data
Logical Device 3 ( MPU-401) data
Logical Device 4 ( CD-ROM) data
Logical Device 5 (Modem) data
End of Resource byte & checksum byte
Firmware patch code.
ASCII ID string
FM Synthesizer, Sound Blaster Pro) data
2
PROM section for more information
2
PROM data load, in assembly for-
2
2
PROM validation: 55h, BBh
PROM is read during the power-
2
PROM interface and E
CS4237B
2
PROM is
2
PROM
2
PROM
17