
THCV242_ Rev.2.00_E
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2019 THine Electronics, Inc. THine Electronics, Inc.
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Security E
Multiple camera synchronization Frame Vsync supply
Frame VSYNC can be supplied from THCV242 to Sub-Link Slave GPO.
EXTSYNC input or internally generated VSYNC become supply source. Settings are configurable by 2-wire
access to internal register. When internal VSYNC is selected, generated VSYNC is not only sent to remote Sub-
Link Slave but also output from EXTSYNC pin.
Internal VSYNC uses two clock source, internal oscillator clock and video pixel clock from Main-Link input. At
the beginning of internal VSYNC generation operation, oscillator clock is used to supply VSYNC. After Main-
Link video source is received stable, internal VSYNC generation source is switched to video pixel clock from
selected Main-Link input. When Main-Link video pixel clock input is lost, internal VSYNC generator again uses
internal oscillator clock until Main-Link video pixel clock input is regained.
Table 23.
Multiple camera synchronization Frame Vsync supply setting 1/2
bit
Register Name
width
R/W
init
Description
0x10 07
[7:4]
reserved
4
-
-
-
0x10 07
[3:0]
R_EXTSYNC_MODE
4
R/W
4'h0
EXTSYNC I/O Mode
0:Disable
1:Normal Mode (Controlled by Sub-Link Register)
2~F: Reserved
Adr