9914 and sending data back across the bus.

We are programming a device with the 9914 chip, and we can write commands to the device, but are having trouble getting the device to write data back. When using the interactive tool, by executing "ibrd 100" is the device addressed as the talker? What is a fairly straight forward method for passing 1 byte of data from the device to the controller? We have a routine that waits till the TA bit in ISR1 sets, before it placed the byte in the CDOR. But the TA bit never sets, even after we execute ibrd 100 with the interactive tool. Is there something else we need to do? Any help would be appreciated.
Thanks
Rick

Enabling interrupts should not have an affect. Can you give me a summary of how you are setting up the chip? For example, what are you setting in the ADR register? This register sets the addressing mode of the chip. If you are not setting it up correctly at address 3, you would, of course, not get an interrupt.
So, lets assume you are setup correctly. There are a couple of different things to try.
1) You can look at the MAC bit in ISR0. This is the My Address Changed bit, which should set everytime your addressing mode changes.
2) Note that the NAT9914 does not have static bits in the ISR registers. If you read a register, the bit will clear automatically. Just in case something else asserted along with MA and you hand
led it but forgot to check MA, you will lose it.
3) You can try setting MA IE. This will not generate an interrupt if you have interrupts disabled, but it will cause an NDAC holdoff. In this case, the ibrd 100 should timeout on the host side if the device is actually doing the holdoff.

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