The application for my microcontroller is to interface to 3 seperate CAN buses. I am using the TWR-K64F Tower Kit. For one of the CAN buses I used the integrated FlexCAN built into the microprocessor. For the next two buses, I will need to communicate with a seperate CAN Controller. The CAN Controller that I would like to use is an SJA1000. There are two modes of operation for this controller, Intel or Motorola mode. I will be operating the controller in Motorola mode because the R/WR signal is on one pin from the FlexBus.
This controller communicates on a parallel bus with 8 data/address pins multiplexed. I would like to use the FlexBus to communicate with the controller.
However, the controller needs an E (Enable) signal that goes high just after the chip select asserts, and goes low just before the chip select goes back high.
I thought I would be able to use the Byte Enable signal from the microcontroller and just invert it for the Enable pin.
I connected my oscilloscope to the EBI_BE_32_24_B pin on the C side expansion port but it never changes state.
I can view the clock out signal and chip selects on the oscilloscopes and those are working properly, but the byte enable signal seems to not be working.
Am I connecting to the wrong pin? Below is how I setup for using the BE_32_24_B pin: