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Features and Functions 3
U2781A User’s Guide 29
USB Backplane
Figure 3- 1 illustrates the 55- pin assignment of the backplane
connector pin.
Figure3-1 55-pin backplane connector pin assignment
Table 3-1 Pin information of SSI connector
11 GND +12V +12V GND USB_D+ USB_D- GND
10 GND +12V +12V +12V GND GND GND
9 GND +12V +12V +12V GND USB_VBUS GND
8 GND LBL0 BRSV GND TRIG0 LBR0 GND
7 GND LBL1 GA0 TRIG7 GND LBR1 GND
6 GND LBL2 GA1 GND TRIG1 LBR2 GND
5 GND LBL3 GA2 TRIG6 GND LBR3 GND
4 GND LBL4 STAR TRIG GND TRIG2 LBR4 GND
3 GND LBL5 GND TRIG5 GND LBR5 GND
2 GND LBL6 CLK10M GND TRIG3 LBR6 GND
1 GND LBL7 GND TRIG4 GND LBR7 GND
ZA B C D E F
SSI timing signal Functionality
+12V +12 V power from backplane
GND Ground
BRSV Reserved pin
TRIG0~TRIG7 Trigger bus 0 ~ 7
STAR_TRIG Star trigger
CLK10M 10MHz reference clock
USB_VBUS USB bus power, +5 V
USB_D+, USB_D- USB differential pair
LBL <0..7> and LBR <0..7> Reserved pin
GA0, GA1, GA2 Geographical address pin