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BBB_IDC26_26

BBB_IDC26_26

BBB_IDC26_26

The standard Parallel Port Pinout (Port A) is on the right in the picture.
The General I/O with analog (Port B) is on the left.
	IDC26 Pinout (Right Side)			IDC26 Pinout (Left Side)
Pin	Port A		Func.		Port B		Func.
1	8-7		OUT		8-7		I/O
3	8-12		OUT		9-25		I/O
5	8-11		OUT		9-27		I/O
7	8-16		OUT		9-29		I/O
9	8-15		OUT		9-31		I/O
11	9-15		OUT		9-33		I (Analog)
13	9-23		OUT		9-37		I (Analog)
15	9-11		OUT		9-39		I (Analog)
17	9-13		OUT		9-16		I/O
19	8-9		IN		9-24		I/O
21	8-10		IN		9-26		I/O
23	8-14		IN		9-28		I/O
25	8-18		IN		9-30		I/O
2	8-13		OUT		9-36		I (Analog)
4	9-41		IN		9-38		I (Analog)
6	8-19		OUT		9-40		I (Analog)
8	9-14		OUT		9-42		I/O

Pins 10, 12, 14, 16, 18, 20, 22, 24 on both ports are attached to GND.
Pin 26 on Port A is attached to 3.3 Volts
Pin 26 on Port B is attached to 5 Volts.
A standard IDC26 to DB25 female cable can be used to convert the Port A IDC26 pinout to the standard DB25 Parallel port pinout (without use of 3.3V signal).

Pin 1 on both ports is an output and the signal is also used to enable the buffers on both ports. It needs to be programmed active low to enable the port buffers. It is BBB P8-7.

Port A IDC26 Pins 19, 21, 23, 25, 4 are inputs and need to be programmed as such in the BBB. These are driven to the BBB by LVC541 buffers. The inputs have RC filtering on them and are pulled to 3.3V with pullup resistors and can accept standard 5V logic levels.

Port A IDC26 Pins 3, 5, 7, 9, 11, 13, 15, 17, 2, 6, 8 are outputs and need to be programmed as such in the BBB. They are driven from the BBB by LVC541 buffers powered at 3.3 volts.

Port B I/O are buffered through FET switches are inputs or outputs as based on the direction setting inside the BBB except those labeled (Analog) which are inputs with a maximum voltage of 1.8 Volts. Non Analog signals are 3.3 volts rated.


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