Preliminary
AC97 CONTROLLER
S3C2451 RISC MICROPROCESSOR
27-14
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
AC97 GLOBAL STATUS REGISTER (AC_GLBSTAT)
This is the status register. When the interrupt is occurred, you can check what the interrupt source is.
Register Address
R/W
Description
Reset
Value
AC_GLBSTAT
0x5B000004
R
AC97 Global Status Register
0x00000001
AC_GLBSTAT Bit
Description
Initial
State
- [31:23]
Reserved. 0x00
Codec ready interrupt
[22]
0 : Not requested 1 : Requested
0
PCM out channel underrun
interrupt
[21]
0 : Not requested 1 : Requested
0
PCM in channel overrun
interrupt
[20]
0 : Not requested 1 : Requested
0
MIC in channel overrun interrupt
[19]
0 : Not requested 1 : Requested
0
PCM out channel threshold
interrupt
[18]
0 : Not requested 1 : Requested
0
PCM in channel threshold
interrupt
[17]
0 : Not requested 1 : Requested
0
MIC in channel threshold
interrupt
[16]
0 : Not requested 1 : Requested
0
- [15:3]
Reserved. 0x000
Controller main state
[2:0]
000 : Idle 001 : Init 010 : Ready
011 : Active 100 : LP 101 : Warm
001
AC97 CODEC COMMAND REGISTER (AC_CODEC_CMD)
When you control writing or reading, you must set the Read enable bit, If you want to write data to the AC97
Codec, you set the index(or address) of the AC97 Codec and data.
Register Address
R/W
Description
Reset
Value
AC_CODEC_CMD
0x5B000008
R/W
AC97 Codec Command Register
0x00000000
AC_CODEC_CMD Bit
Description
Initial
State
-
[31:24] Reserved
0x00
Read enable
[23]
0 : Command write
(1)
1 : Status read
0
Address
[22:16]
Codec command address
0x00
Data
[15:0]
Codec command data
0x0000
Note:
When the commands are written on the AC_CODDEC_CMD register, It is recommended that the delay time between
the command and the next command is more than 1 / 48KHz.