Question: Are there any differences with ATA_EN between the AT2 and AT2+?
Answer: Description of Change:
Because the CY7C68300A supports a true low-power USB suspend state, new functionality was added to ensure that transitions of the
ATA_EN signal could be detected properly under all circumstances.
The CY7C68300A will behave in the following manner.
- If ATA_EN transitions to '0' during normal operation, the CY7C68300A will disconnect from the USB and drop to a low-power mode.
- If ATA_EN transitions to '1' when in low-power mode and no other condition is causing the low-power state, the CY7C68300A will return to a post-reset state and reconnect to the USB.
- If the CY7C68300A is already in suspend and ATA_EN transitions to '0', the CY7C68300A will resume only long enough to stop driving the ATA interface and drop back to low-power again.
- If the CY7C68300A is already in suspend and ATA_EN transitions to '1', the CY7C68300A will resume only long enough to start driving the ATA interface and drop to low-power again.
ATA_EN must be set to a '1' for at least 50mS following the release of RESET#, by a pull-up resistor or other logic, to ensure proper operation.
Related Documents:
ATA Bus Sharing with the ISD-300(TM) LP
