YMF744B ETC [List of Unclassifed Manufacturers], YMF744B Datasheet - Page 30

• Manufacturer Part Number: YMF744B
• Description: DS-1S
• Manufacturer: ETC [List of Unclassifed Manufacturers]

YMF744B
60-61h: FM Synthesizer Base Address
62-63h: Sound Blaster Base Address
b4................SPR4: Secondary AC’97 Power Down Control 4
b5................SPR5: Secondary AC’97 Power Down Control 5
b6................SPR6: Secondary AC’97 Power Down Control 6
b7................SPR7: Secondary AC’97 Power Down Control 7
Respective data set to b[7:0] are correspondingly set into the “Power down Control/Status” register in the
Secondary AC’97 via the AC-Link. These are not set into the power down register in the Primary AC’97.
b[15:2] ........FM Synthesizer Base Address
b[15:4] ........Sound Blaster Base Address
This bit controls the power state of the AC-link in the Secondary AC’97.
Setting this bit to “1” disables the internal clock of the Secondary AC’97. In case the AC’97 is used with
DS-1S, the master clock is supplied from DS-1S. Therefore, when the clock is stopped completely, set
SPR5 bits to “1” firstly, then the CMCD bit should be set to “1” after duration of 20µs or longer.
This bit controls PR6 bit status of the power control register in the Secondary AC’97.
This bit controls PR7 bit status of the power control register in the Secondary AC’97.
This register sets the base address of the FM synthesizer. If b5:I/O bit of 40h register is set to “1”, b[9:2]
bits are decoded by ignoring b[15:10] bits.
This register sets the base address of the Sound Blaster. If b5:I/O bit of 40h register is set to “1”, b[9:4]
bits are decoded by ignoring b[15:10] bits.
b15
b15
“0”: Normal
“1”: Power down
“0”: Normal
“1”: Disable
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
b14
b14
b13
b13
b12
b12
(default)
(default)
Sound Blaster Base Address
b11
b11
FM Synthesizer Base Address
b10
b10
b9
b9
-30-
b8
b8
b7
b7
b6
b6
b5
b5
b4
b4
b3
b3
-
February 3, 1999
b2
b2
-
b1
b1
-
-
b0
b0
-
-