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μ
PD720231
5. Boot Mode
There are 2 boot modes in the
HDD/SDD boot mode has Quick/Slow enumeration option. These are selected from GPIO setting
during initialization.
GPIO0
x
1
1
5.1 SROM boot mode
μ
PD720231 boots up with internal firmware, and uses parameters and firmware patches from external
SROM (SPI Flash). Utility tool is used to set these parameters and firmware patches into external SROM.
Please refer to the application note of utility tool in more detail.
5.2 HDD/SSD boot mode
μ
PD720231 boots up with internal firmware, and uses parameters and firmware patches from HDD/SSD
devices. Utility tool is used to set these parameters and patches into HDD/SSD. Please refer to the
application note of utility tool in more detail.
Quick/Slow enumeration are selected with pin strapping option, as in Table 5-2.
Setting
Quick enumeration
Slow enumeration
R19UH0094EJ0100 Rev 1.00
Mar 1, 2013
μ
PD720231, SROM boot mode and HDD/SSD boot mode.
Table 5-1.
GPIO1
GPIO2
GPIO3
x
x
1
0
0
0
0
1
0
Table 5-2.
Quick and Slow enumeration setting
Some HDD drives take time for spin up, and if PC may not wait this period,
μ
PD720231 may not be enumerated properly. To prevent this case,
μ
PD720231 responds default information of internal mask FW to host system.
After getting information of SATA device, it disconnects, connects again, and
responds the latest information of SATA device to host system.
μ
PD720231 starts the connection to host system, afer Initialization of SATA
device completes. In this mode,
actually plug out. This mode is recommended, in submitting to USB compliance
test.
Boot Mode selection
Mode
SROM boot
HDD/SSD boot
Behavior
μ
PD720231 keeps its connection to host until it
5. Boot Mode
Option
−
Slow enumeration
Quick enumeration
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