Ac97 Controller State Diagram - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR

7 AC97 CONTROLLER STATE DIAGRAM

INIT
This is the state diagram of AC97 controller. It is helpful to understand AC97 controller state machine. State
above figure is synchronized by peripheral clock (PCLK). It is able to monitor state at AC_GLBSTAT register.
IDLE
1
9
9
2
READY
: PCLK rising
1
: ACLINK_ON
2
: CODEC_READY & TRANS_DATA & NORMAL_SYNC
3
: ~CODEC_READY | ~TRANS_DATA
4
: !ACLINK_ON
5
: POWER_DOWN
6
: WARM_RESET
7
: CODEC_WAKEUP
8
: COLD_RESET | ~PRESETn
9
Figure 24-9. AC97 State Diagram
9
8
9
5
ACTIVE
4
3
AC97 CONTROLLER
WARM
9
7
6
LP
24-11