Question: Can the 8051 tri-state the ATA interface pins on the CY7C68013 Mass Storage application (Reference design CY4611) so that another device can take over the bus?
Answer: With the CY4611 v2.30 (and later) firmware that is currently available on the web, the FX2 is able to tri-state its ATA interface pins based upon the level of the WAKEUP# pin. When the WAKEUP# pin is LOW, all of the ATA interface pins are tri-stated. When the WAKEUP# pin is HIGH, the CY4611 resumes normal ATA interface operations. This is similar to the feature available in the ISD-300A1 and EZ-USB AT2. Note, however, that not all ATA interface pins will be tri-stated if WAKEUP# is set LOW during startup. A HIGH-to-LOW transition of WAKEUP# is necessary to tri-state the ATA interface pins.
