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