Zoran ZR 36506 USBV ision – Datasheet
Zoran Proprietary and Confidential
S erial Pipe Out I nterface
16 -1
16 S
ERI AL
P
I PE
O
UT
I
NTER FACE
Description
The Serial Pipe Out (SPO) interface is used for compressed video and audio data transfer to
external devices. This interface is used in Standalone mode (when not connected to USB)
The SPO consists of the following signals:
Pin # Pin Name
I/O
Description
11
10
USB_CLK_OUT
USB_DAT
O
O
12 MHz clock for bit sampling.
Serial data output. This signal carries both compressed
video and PCM audio signals.
9
USB_VALID
O
Data-Valid signal.
‘1’
‘0’
Switch from ‘0’ to ‘1’ indicates beginning of a new byte.
indicates that data is valid.
indicates “ignore data signal”.
8
USB_EP2
O
Video Data Select signal.
‘1’
indicates video data region.
7
USB_EP3
O
Audio Data Select signal.
‘1’
indicates Audio data region.
29
IO1
I
Video Data Request.
‘1’
means external device is ready to receive more
data.
‘0’
means external device cannot receive more data
now.
Video and audio data are byte-oriented and always begin with the LSbit. The signal
USB_VALID always returns to ‘0’ between every two subsequent bytes, hence it can be used for
byte synchronization.
The signals USB_EP2 and USB_EP3 indicate whether the data belong to the video or audio
streams respectively. The signal USB_EP2 can also indicate the end of a video frame and the
beginning of the next one. Refer to the waveform diagrams for this indication.