3 PH PWM BLDC Motor Control Board

[TBone1946]

I originally posted this request earlier today.  When I went back to look at the attachment I found that it was not as I had intended. So I am resubmitting this same request with the proper attachment.

I have the above mentioned board that is shown in the attachment.   (3PH PWM BLDC Motor Controller 2.jpg) It is made to drive a 24 volt DC three phase bldc motor.  The power terminals are noted. (POW) I have a 24 volt DC supply.  There are 5 control terminals for the controller.  (Blue terminal block)  The added lines on the board show the second layer connections that are made on the bottom of the board.  I see the connections that are made to the ATMEL ATF16V8CZ.  The controller drives the motor from a slow speed to a top speed in both the forward and the reverse directions.  I assume that a PWM signal is used on one of the two terminals leading to the ATMEL but I am not sure which one and I do not know how the direction determined?  Any help is greatly appriciated.  The project is to use the worm gear driven motor for a miniture elevator.  Thank you in advance for any advice.

[DavidAlfa]

Probably one the pins by setting it high or low.
The ATF16V8CZ is programable logic so there's no easy way to figure out how it works.

[PCB.Wiz]

The ATF16V8 is programmable, but it is simple and you can work backwards.
The CLK is always on Pin1, which strangely seems firmly +5V connected here, so that leaves a ROM/Table usage.

eg with 4 lines, they may have a 3 bit lookup for 6 driving phases and a PWM modulate, which should be easy to decode with just 5V applied and a  4 bit binary switch & multimeter.