Data Sheet
USB Audio Controller
SN11220ACF
Bit 13 be set to “0”.
Bit 14 selects 512 times sampling rate for I
2
S interface.
Bit 15 be set to “0”.
PCM IF Long-frame
PCM IF Short-frame
VII. HID bytes arrangement：
：
The SN11220ACF is equipped with a special feature to let the host software to
communicate with the USB downstream devices via the HID pipe. Using this feature,
the system manufacturers can easily upgrade or increase the functions of their product
by just updating the software installed on the PC. There are 16 bytes each for HID in
and HID out. They will be explained in the paragraphs below separately.
To receive the data from two-wire serial port and button/GPIO status from the
SN11220ACF, there are two ways. The first is to receive the HID report of the HID
pipe regularly. If any button/GPIO value changes or data received from the two-wire
serial port, the new values will be sent to the host every HID interval time（defined in
word 0x13 bit 0 to 7 and default is 10ms）. The second way is to issue a HID class
Sonix Confidential
- 12 -
Do not copy, reproduce, or distribute without permission
2006 Aug 10, V1.01
SONIX [ SONIX TECHNOLOGY COMPANY ]
