STV-376-E01 STMICROELECTRONICS [STMicroelectronics], STV-376-E01 Datasheet - Page 20

• Manufacturer Part Number: STV-376-E01
• Description: Ultra-low power laser motion sensor for laser mouse applications
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

General features
Figure 10. Frame dump mode timing diagram
7.5
20/30
frame_dump_completed
frame_dump_ready
frame_dump_pixel
frame_dump_en
Image streaming
To enter this test mode, set bit 4 of registry 0x62 to 1 (PCI_test_enable).
In this mode, the pins VGATE_ON, RESET_OUT, LASER_NEN and MOTION are used to
output serially fast video data in the form of 2 bits nibble + FST and QCLK.
Upon receipt of an FST (LASER_NEN) rising edge, NIB_EVEN (VGATE_ON) and
NIB_ODD (RESET_OUT) output data every 48 MHz clock cycle. The signals should be
sampled 10 ns after the FST rising edge, and then every 20.8 ns exactly, during
400 x 4 = 1600 cycles.
Groups of four consecutive NIB_EVEN and NIB_ODD must then be repackaged together to
form a single 8-bit pixel data. This format enables the pixels to be output at the same frame
rate as normal operation, and keeps I2C available to access the usual register settings.
For more details on image streaming please refer to the VT5376 image system user
manual.
NORMAL MODE
set by user
set by 376
pixel address
0
400 x I2C single reads of pixel data
1
2
FRAME DUMP MODE
3
set by 376
398
399
NORMAL MODE
reset by user
VT5376