Use the pin-one mark to orient the connector. The map begins with RD1 and RD2 on pins 1 and 2. Data labels in this definition run from RD1 on pin 1 to BD2 on pin 8.
Connector pin assignments
| Pin | Signal | Pin | Signal |
|---|---|---|---|
1 | RD1 | 2 | RD2 |
3 | GD1 | 4 | BD1 |
5 | RD3 | 6 | RD4 |
7 | GD2 | 8 | BD2 |
9 | CLK | 10 | GND |
11 | LAT | 12 | GND |
13 | OE | 14 | GND |
15 | A | 16 | GND |
Frequently asked questions
Where are the control signals on HUB121?
CLK on pin 9, LAT on pin 11, OE on pin 13. Match these labels against the mating connector before installing the board.
Which positions are marked ground?
The interface definition marks 10, 12, 14, 16 as GND. Check the connector orientation before counting pin positions.
Which pins carry the row address lines?
A on pin 15. Use the complete pin map when comparing another HUB board.




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