Samsung S5PC110, Руководство пользователя

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S5PC110_UM 4 AC97 CONTROLLER
4-17
4.5.1.3 AC97 Codec Command Register (AC_CODEC_CMD, R/W, Address = 0xE220_0008)
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.
AC_CODEC_CMD Bit Description Initial State
- [31:24] Reserved 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 to have more than 1 / 48
kHz delay time between the command and the next command.
4.5.1.4 AC97 Codec Status Register (AC_CODEC_STAT, R, Address = 0xE220_000C)
If the Read enable bit is 1 and Codec command address is valid, Codec status data is also valid.
AC_CODEC_STAT Bit Description Initial State
- [31:23] Reserved. 0x00
Address [22:16] Codec status address 0x00
Data [15:0] Codec status data 0x0000
NOTE:
Steps to read data from AC97 codec register via the AC_CODDEC_STAT register:
1. Write command address and data on the AC_CODEC_CMD register with Bit[23] =1.
2. Set a proper delay time. It depends on Codec type.
3. Read command address and data from AC_CODEC_STAT register.