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S3C2440A RISC MICROPROCESSOR AC97 CONTROLLER
24-9
AC97 GLOBAL STATUS REGISTER (AC_GLBSTAT)
Register Address R/W Description Reset Value
AC_GLBSTAT 0x5B000004 R AC97 Global Status Register 0x00000000
AC_GLBSTAT Bit Description Initial State
Reserved [31:23]
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
Reserved [15:3]
0x000
Controller Main State [2:0]
000 : Idle 001 : Init 010 : Ready
011 : Active 100 : LP 101 : Warm
000
AC97 CODEC COMMAND REGISTER (AC_CODEC_CMD)
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
Reserved
[31:24] 0x00
Read enable
[23]
0 : Command write
(NOTE)
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 1/48 Hz.