Choice Between SLCS# and FLAGD in Slave FIFO Mode

Question: Can I configure PA7/FLAGD/SLCS# as FLAGD while operating in SLAVE FIFO mode?

 

Answer:

PA7/FLAGD/SLCS# can be configured as FLAGD or SLCS# while operating in SLAVE FIFO mode using PORTACFG register. The external logic uses SLCS# to select or deselect EZ-USB while sharing the FIFO data bus among multiple slave devices. For applications that do not need sharing of FIFO Data bus, FLAGD can be used. For applications that share FIFO Data bus, FLAGD cannot be used since we need SLCS# to avoid bus contention among slave devices.