CS4239 datasheet(18/98 Pages) CIRRUS

18 / 98 page

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

2PROM space used would be 388

bytes. However, the part also supports firmware

upgrades via the E

2PROM. To support firmware

upgrades, the E

2PROM size must be greater than

770 bytes. After power-up, the existence of an

2PROM is checked by reading the first two

bytes from the E

2PROM interface. If the first

two bytes from the E

2PROM port read 55h and

BBh, then the rest of the E

2PROM data is

loaded into the internal RAM. If the first two

bytes aren’t correct, the E

2PROM is assumed not

to exist. For motherboard designs, internal de-

fault PnP data is provided or a Hostload

sequence can be used to update the resource

data. If the part is installed on a plug-in card,

then an external E

2PROM is required to ensure

that the proper PnP resource data is loaded into

the internal RAM prior to a PnP sequence. See

Physical Device

Logical Device

Best Choice

Acceptable

Choice 1

Sub optimal

Choice 1

Sub optimal

Choice 2

WSS

EISA ID = CSC0000

ANSI ID = WSS/SB

16-bit address

decode

WSSbase

Length/Alignment

534h

4/4

534-FFC

4/4

534-FFCh

4/4

high true

edge sensitive

IRQ

(SB share)

5,7,9,11,12,15

(SB share)

5, 7, 9, 11, 12, 15

(SB share)

8-bit, count by

byte, type A

DMA0

(playback)

(SB share)

1, 3

(SB share)

0, 1, 3

(SB share)

same

DMA1

(record)

0, 3

0, 1, 3

----

Synthesis

16-bit address

decode

SYNbase

Length/Alignment

388h

4/8

388h

4/8

388-3F8h

4/8

IRQ

----

SB Pro

16-bit address

decode

SBbase

Length/Alignment

220h

16/32

220-260h

16/32

220-300h

16/32

Game Port

EISA ID = CSC0001

ANSI ID = GAME

16-bit address

decode

GAMEbase

Length/Alignment

200h

8/8

208h

8/8

Control

EISA ID = CSC0010

ANSI ID = CTRL

16-bit address

decode

CTRLbase

Length/Alignment

120-FF8h

8/8

IRQ

----

MPU401

EISA ID = CSC0003

ANSI ID = MPU

16-bit address

decode

MPUbase

Length/Alignment

330h

2/8

330-360h

2/8

330-3E0h

2/8

IRQ

9,11,12,15

----

---- Feature not supported in the listed configuration, but is supported through customization.

Table 1. Typical Motherboard Plug-and-Play Resource Data

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

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