AK4571 Datasheet, PDF (48/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
5.6.
Endpoint Control Request
AK4571 ADC DAC 6
Set Endpoint Control Request
AK4571
SET_CUR
GET_MIN, GET_MAX,GET_RES
5.6.1. Set Endpoint Control Request
GET_CUR
Offset Field
Size Value
0
bmRequestType
1 0x22
1
bRequest
1 0x01
2
wValue
2 0x0100
4
wIndex
6
wLength
2 0x0081
0x0002
2 0x0003
Description
SET_CUR
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Lower byte : zero
Endpoint Address (0x81: A/D)
Endpoint Address (0x02: D/A)
The Length of Sampling Frequency Parameter Block
Offset Field
0
iSampleFreq
A/D D/A
Size Value
3 0xYYYYYY
Description
The following seven values are valid. Others are invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x003E80 : 16kHz
0x005622 : 22.05kHz
0x007D00 : 32kHz
0x00AC44 : 44.1kHz ( default of this LSI )
0x00BB80 : 48kHz
5.6.2. Get Endpoint Control Request for IN endpoint
Offset Field
Size Value
0
bmRequestType
1 0xA2
1
bRequest
1 0x81
2
wValue
2 0x0100
4
wIndex
6
wLength
2 0x0081
0x0002
2 0x0003
Description
GET_CUR
Upper byte: SAMPLING_FREQ_CONTROL (0x01)
Lower byte : zero
Endpoint Address (0x81: A/D)
Endpoint Address (0x02: D/A)
The Length of Sampling Frequency Parameter Block
Offset Field
0
iSampleFreq
Size Value
3 0xYYYYYY
Description
The following seven values are valid. Others are invalid.
0x001F40 : 8kHz
0x002B11 : 11.025kHz
0x003E80 : 16kHz
0x005622 : 22.05kHz
0x007D00 : 32kHz
0x00AC44 : 44.1kHz ( default of this LSI )
0x00BB80 : 48kHz
MS0153-J-02
- 48 -
2003/3