AOpen AP5TC User Manual page 85

Manufacturer
Samsung
NEC
Hitachi
Fujitsu
TI
TI
TI
TI
Q: What is Bus Master IDE (DMA mode)?
A: The traditional PIO (Programmable I/O) IDE requires the CPU to involve in
all the activities of the IDE access including waiting for the mechanical
events. To reduce the workload of the CPU, the bus master IDE device
transfers data from/to memory without interrupting CPU, and releases CPU
to operate concurrently while data is transferring between memory and IDE
device. You need the bus master IDE driver and the bus master IDE HDD
to support bus master IDE mode. Note that it is different with master/slave
mode of the IDE device connection. For more details, refer to section 2.3
"Connectors".
Q: What is 3.3V Over-current Protection?
A: The Over-current Protection was very popular implemented on the Baby AT
or ATX +5V/+12V switching power supply. It is very useful to prevent
accident short circuit when you install the mainboard, HDD, add-on cards
into housing. But unfortunately, the new generation CPU and chipset use
3.3V or 2.8V voltage which has regulator to transfer 5V to 3.3V/2.8V, and
makes 5V over-current protection useless. AOpen TX mainboard
AP5T/AX5T with switching regulator onboard support 3.3V (Vcpuio,
chipset, PBSRAM, SDRAM) and 2.8V (CPU Vcore) over-current protection,
in conjunction with 5V/12V power supply provide the full line over-current
protection.
Q: What is CPU Thermal Protection?
A: The higher speed of CPU , the more heat dissipation need to be taking into
consideration. If user does not use correct fan for the CPU cooling, it is
highly possible the CPU can over heat and causing system unstable.
AOpen AP5T/AX5T/AX6F has special thermal detection circuit under the
Frequently Asked Question
Model
KM416511220AT-
G12
D4S16162G5-A12-7JF
HM5216805TT10
81117822A-100FN
TMX626812DGE-12
TMS626812DGE-15
TMS626162DGE-15
TMS626162DGE-M67
Suggested CAS
Latency Time
2
2
2
2
2
3
3
3
5V Tolerance
Yes
No
No
No
Yes
Yes
Yes
Yes
A-3