SC9822P

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.0

2006.07.21

Http: www.silan.com.cn

Page 21 of 30

5.3 Configure audio input and output interface

² HOST need to configure audio input interface. The input and output are 24 Bitclk of IIS interface. Send

the command 0x0f to register BitStreamType (8’

h76).

5.4 Configure compress mode, shake detecting mode, and shake signal shield time

² HOST need to configure the compress mode. There are 4 compress modes to be selected (16: 4

compress, 16:5 compress, 16:6 compress and non-compress), which will send the command to register

MSC85H(8’

h52).

² HOST need to configure the shake detecting mode. There are 4 modes to be detected(rising edge of sub

block sync signal, shake signal low level determinant; falling edge of sub block sync signal, shake signal

high level determinant; shake signal low level determinant; shake signal high level determinant), Send

the command to register MSC85H(8’

h52).

² HOST can configure shake signal shield time. Because Cd servo only receives some very short level

jam signal, but not the signal we need, we can solve this problem by setting the shake signal shield time.

Send the shielded time to register (8’

h5b), the unit is 128*59ns=7.552us, the length of shake signal

within the input value, it will not be considered as shake signal. The maximum shake shield time is

255x7.552us = 1,925.880 us.

5.5 Begin to encode and decode

² HOST sends encoding start command. Send 0xa1 to register MSC80H (8’h50).

5.6 Read Q sub code

² Read Q sub code of Cd every other time, and if the Q sub code is not continuous, do not enter Esp

control flow, delay and read again. if the Q sub code is continuous, enter Esp main control flow.

5.7 Adopt query method to detect the state

² HOST will send query command every other time. Read register MSC90H (8’h53).

5.8 Send WAQV signal

² HOST sends affirm command of effective signal. When the state is normal, send the command 0x80 to

register MSC83H (8’

h51), and record the current effective address of Q sub code.

5.9 Send the compare& connect command

When read the three abnormal states of shake signal, input buffer overflow and Sdram data overflow, take

CD back according to the effective address of Q sub code. Then begin to compare& connect to correct data.

² HOST configures the compare&connect command. There are 3 methods (16-bit, 12-bit, 8-bit precision).

Send the command to register MSC83H(8’

h51).

² HOST sends the compare & connect start command. There are two methods(3 pairs data comparative,

direct compare & connect). Send the command to register MSC80H(8’

h51).