YMF721 datasheet(27/41 Pages) LSI

27 / 41 page

YMF721

July 10, 1997

- 27 -

Supplementary Information 1 (about commands)

The following commands are used to check existence and identification of YMF704C/721(OPL4-

ML/ML2) by using device driver.

Command 80h

This command is used mainly to obtain version information of the internal processor. The device

driver is able to know capability of the internal processor before it controls the hardware.

Sub Command 00h : Get Processor Device ID

The character string "GMP_OPL4" is read from ID strings. Existence of YMF721 (OPL4-ML2) can

be confirmed with this character string.

Command

Sub Command Command Length Response Length

Function

80h

00h

3byte

11byte

Get Processor Device ID

80h

01h

3byte

5byte

Get Processor Software Version

80h

02h

3byte

6byte

Get Processor Software Capacity

81h

00h

3byte

8byte

Get OPL4-MLx Information

82h

00h

3byte

31byte

Get wave ROM Copyright Data

82h

01h

3byte

5byte

Get wave ROM Version

Command

Response

80h

Command byte

8Ah

Response 1st byte

00h

Sub Command

47h ”G”

00h

Check sum

4Dh “M”

50h “P”

5Fh “_”

ID Strings

4Fh “O”

50h “P”

4Ch “L”

34h “4”

00h

Strings Last Code

1Eh

Check sum

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