CS4239 datasheet(21/98 Pages) CIRRUS

21 / 98 page

015h, 002h

; LOGICAL DEVICE 2

047h, 001h, 020h ; CTRLbase = 0x120

033h, 001h

; activate logical device 2

015h, 003h

; LOGICAL DEVICE 3

047h, 003h, 030h ; MPUbase=0x330

022h, 009h

; MPU IRQ = 9

033h, 001h

; activate logical device 3

079h

; activate CS4239 device

If all the above data is sent, after the Crystal key,

all devices except the CDROM will respond to

the appropriate resources given.

Crystal Key 2

A new feature of this part is the addition of an-

other way to bypass the PnP interface using a

new key, designated Crystal Key 2 (CK2). This

new key is designed for Codecs on the mother-

board that are hidden from normal PnP. The

following 32 bytes, in hex, are Crystal Key 2

followed by the upper 8 bits of the Read Data

port (RDP):

95, B1, D8, 6C, 36, 9B, 4D, A6,

D3, 69, B4, 5A, AD, D6, EB, 75,

BA, DD, EE, F7, 7B, 3D, 9E, CF,

67, 33, 19, 8C, 46, A3, 51, A8, <RDP>

This key differs greatly from the original Crystal

Key in that the 33rd byte defines the upper 8 bits

of the 10-bit Read Data port address, with the

lower 2 bits equal to 11. As an example, if the

RDP byte is 0x82, then the actual Read Data

port is 0x20B. Another difference is that the

original Crystal Key uses custom commands and

is write-only; whereas, CK2 places the part in a

PnP Configuration state and uses standard PnP

commands to access PnP configuration registers.

Since CK2 is unique to the CS4239, the PnP iso-

lation sequence is bypassed.

CK2 differs from normal PnP in that the RDP is

read/write instead of read-only. In PnP the RDP

is read-only and a second address, designated the

Write Data Port (0xA79), is used to write data

into PnP registers. Using CK2, all configuration

is done through the RDP, there is no Write Data

Port. When finished, a Wait-for-Key command

should be issued to the Address Port which

places the part back in the normal mode of op-

eration. Note that the Address Port (AP) can also

be moved away from the normal PnP location of

0x279. See the Address Port Configuration sec-

tion for more information.

The CK2 configuration sequence is as follows:

1. CK2 32 bytes are sent to the Address Port fol-

lowed by the upper 8 bits of the RDP.

2. The AP and RDP are used to read/write con-

figuration information in normal PnP fashion.

6. A Wait-for-Key command is sent removing

the part from the configuration state.

The particluar PnP register is set using the Ad-

dress Port and the data for that register is

read/written to/from the RDP. As an example,

when finished configuring the part, to send the

Wait-for-Key command, a 0x02 is sent to the AP

(selecting the Config. Control register) and a

0x02 is sent to the RDP. This causes the part to

exit the configuration state and enter normal op-

eration (Wait-for-Key).

Hardware Configuration Data

The Hardware Configuration data contains map-

ping information that links interrupt and DMA

pins with actual interrupt numbers used by PnP

and SLAM procedures. The Hardware Configu-

ration data precedes the PnP Resource data.

The Hardware Configuration data is either 19 or

23 bytes long and contains the data necessary to

configure the part. If an E

2PROM is not used

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

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