Samsung S3C2451X User Manual page 701

S3C2451 RISC MICROPROCESSOR
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
9 : COLD_RESET | ~PRESETn
Figure 27-9. AC97 State Diagram
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.
9
8
9
5
ACTIVE
4
3
AC97 CONTROLLER
WARM
9
7
6
LP
27-11