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Altera_Forum's avatar
Altera_Forum
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16 years ago

Bidirectional SPI switch?

This is a complex problem which I am very unsure of, the basic idea is that I want code that switches between 3 SPIs. I was startled when I noticed the statement that I was about to write ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Try this idea...

you better think of signal driving another than connectivity. remember connectivity in HDL does not mean that each side is driving the other.

you will need three choices:

if A master then

A_sclk <= 'Z'; --driven from A chip

B_sclk <= A_sclk;

C_sclk <= A_sclk;

elsif B master then

....