μ
PD720231
6.
General Purpose I/O
R19UH0094EJ0100 Rev 1.00
Page 23 of 30
Mar 1, 2013
6.4
Reset signal for external device
The
μ
PD720231 provides reset signal for external device from GPIO4. GPIO4 drives low in default and it
changes to Hi-Z after
μ
PD720231 read parameter from external SROM or SATA devices and confirms that
this function is supported. If this is not supported, GPIO4 remains low drive. This function is enabled from
utility tool.
Figure 6-1 GPIO4 signal timing chart
GPIO4
After confirming the availability of this function
from external ROM or SATA device.
Pull-up
(on board resistor)
Keep this level during U3/L2.
6.5
Clockout function
The
μ
PD720231 provides clock signal for external device from GPIO7/CLKOUT. GPIO7CLKOUT starts
clock output after
μ
PD720231 read parameter from external SROM or SATA devices and confirms that this
function is supported. If this is not supported, GPIO4 remains low drive. This function is enabled from utility
tool.
Figure 6-2 GPIO7/CLKOUT signal timing chart
GPIO7/CLKOUT
After confirming the availability of this function
from external ROM or SATA device.
Clock stops during U3/L2.
6.6
External trigger in
The
μ
PD720231 provides external interrupt solution using GPIO9/EXTINT. This is used for button solution.
This function is enabled from utility tool and active level is also set from same tool. Host system can check
the status of GPIO9/EXTINT, using vendor command.
