Hi,
I want to tristate a group of outputs based on the state of an input pin (MAX7000S).
I have found the TRI megafunction but it looks like this uses additional resources that shouldn't be necessary. I can see that the I/O control block has a tristate buffer for the I/O pin, so it would appear that I can use this for "free", i.e., without consuming additional resources. I think I need to configure the pins as BIDIR but I can't see how to access/set the global enable for the pins that I want to control.
Can someone tell me where to find this in Quartus please?
Where do I configure the output enables?
Can I set the global enables on a bdf, or do I need to use VHDL to code the control action?
regards
Dave
I want to tristate a group of outputs based on the state of an input pin (MAX7000S).
I have found the TRI megafunction but it looks like this uses additional resources that shouldn't be necessary. I can see that the I/O control block has a tristate buffer for the I/O pin, so it would appear that I can use this for "free", i.e., without consuming additional resources. I think I need to configure the pins as BIDIR but I can't see how to access/set the global enable for the pins that I want to control.
Can someone tell me where to find this in Quartus please?
Where do I configure the output enables?
Can I set the global enables on a bdf, or do I need to use VHDL to code the control action?
regards
Dave