Unibrain 701 ユーザーズマニュアル

Unibrain Fire-i 501/511/601/701/702/810 Operation Manual 

 

Page 52 

 

 
 

This camera supports One-Shot and Multi-Shot features. The camera should be in a Iso_disabled mode before the 

execution of those commands. If the camera is Iso_enabled mode already, those commands are ignored.   

One-Shot (grab one frame) and Multi-Shot (grab 1 ~ 65,535 frames) can be used combined with a hardware trigger 

which grabs either one frame or multi frame according to the command respectively.   

The command can be executed configuring the following registers.   

 

Address F0F0061CH Address F0F0061CH 

Data 80000000h Data  4000nnnh 

nnnn is the number of frames output which can be from any number between 0001h ~ FFFFh.(1~ 65,535)   

Priority of the command execution is as follows.      Continuous Æ One-shot Æ Multi-shot.   

When a command with higher priority is being executed the command with lower priority shall be ignored.   

 

In applications incorporating multi camera, there is often a need to synchronize the cameras. Multi-Camera Auto 

Synchronization is supported utilizing the FireWire bus time cycle register which is connected on the same FireWire bus. 

A maximum of 3 cameras can be auto synchronized.   

The video mode of the camera must be set within the limit of a single FireWire bus bandwidth of 400Mbps. Also the 

maximum shutter value must be set as per the table below not exceeding the FireWire bus cycle time. Jitter may occur 

due to CPU operation timing.   

FPS 

Max Shutter 

Max Shutter 

Max Shutter 

Max Shutter 

Value Time Value Time Value Time Value Time 

60 

1110 

16.5ms 

- - - - -   

30 1276 

33.1ms 

1270 

32.5ms - 

- 

- 

- 

15  1608 66.3ms 1598 65.3ms 1612 66.7ms 1606 66.1ms 

7.5  1760 131ms 1758 129ms 1761 132ms 1760 131ms 

3.75 

1893 

264ms 

1889 

260ms 

1895 

266ms 

1893 

264ms 

To utilize Auto-sync, please set Bit 31 to Auto-sync Enable, and then check the Bit 27 to verify whether it is ready. 

Please refer the details as the following table.   

0xF2F10018 

Auto-Sync Mode control register 
Bit 31 : auto sync enable 
Bit 30 : SIO enable mode (0 : custom mode, 1 : IIDC v1.31) 

Bit 27 : auto sync complete (read only. 1: ready, 0: not yet auto-sync)   

Read/Write