Backboard for hard disk drive and electronic device using the backboard
A backboard applied in an electronic device includes a storage extended chip, a serial attached small computer system interface (SAS) hard disk drive (HDD) connector, a convertor, a first election unit, and a second election unit. An input pin of the convertor is coupled to a plurality of input pins of the SAS HDD, to receive the data signal from the SAS HDD connector. The first election unit is coupled to a first ground pin of the SAS HDD connector, enable pins of the convertor and the storage extended chip. The second election unit is coupled to the first ground pin of the SAS HDD connector and an enable pin of the storage extended chip. When the SAS HDD connector is coupled to a SATA HDD or a SAS HDD, the storage extended chip operates and receives a SAS signal from the SAS HDD connector.
1. A backboard comprising:
a storage extended chip comprising an enable pin, an input pin, and an output pin;
a serial attached small computer system interface (SAS) hard disk drive (HDD) connector comprising a plurality of input pins and a plurality of ground pins, and a data output, the plurality of ground pins further comprises a first ground pin;
a convertor comprising an input pin, an enable pin, and an output pin, wherein the input pin of the convertor is coupled to the plurality of input pins of the SAS HDD, to receive data from the data output; and
an election unit comprising an input terminal, a first election unit, and a second election unit, wherein the first election unit is coupled to the first ground pin of the SAS HDD connector, the enable pin of the convertor, and the enable pin of the storage extended chip, the second election unit is coupled to the first ground pin of the SAS HDD connector and the enable pin of the storage extended chip;
wherein the second election unit includes a first electronic switch and a first resistor, a first terminal of the first electronic switch is coupled to the input terminal of the election unit, and is coupled to the power source terminal through the first resistor; a second terminal of the first electronic switch is grounded; a third terminal of the first electronic switch is coupled to the power source terminal.
2. The backboard of claim 1 , wherein when the SAS HDD connector is coupled to a SATA HDD, the first ground pin of the SAS HDD connector outputs a digital high level signal to the input terminal of the election unit, the first election unit operates, the second election does not operate, the first election unit outputs a first control signal to the enable pin of the convertor and the enable pin of the storage extended chip, the storage extended chip operates and receives a SAS signal from the SAS HDD connector.
3. The backboard of claim 2 , wherein when the SAS HDD connector is coupled to a SAS HDD, the first ground pin of the SAS HDD connector is grounded, and outputs a digital low level signal to the input terminal of the election unit, the first election unit does not operate, the second election unit operates, the second election unit outputs a second control signal to the enable pin of the storage extended chip, the storage extended chip operates and receives a SAS signal from the SAS HDD connector.
4. The backboard of claim 3 , wherein the first election unit comprises a second electronic switch and a second resistor, a first terminal of the second electronic switch is coupled to a first input pin of the SAS HDD connector, and is coupled to the first power source terminal through the second resistor; a second terminal of the second electronic switch is grounded; a third terminal of the second electronic switch is coupled to the power source terminal, and is coupled to the enable pins of the convertor and the storage extended chip.
5. The backboard of claim 4 , wherein the first electronic switch is an npn bipolar junction transistor (BJT), the first to third terminals of the npn BJT correspond to a base, an emitter, and a collector of the BJT, respectively.
6. The backboard of claim 5 , wherein the second electronic switch is a pnp bipolar junction transistor (BJT), the first to third terminals of the pnp BJT correspond to a base, an emitter, and a collector of the BJT, respectively.
7. The backboard of claim 1 , wherein the third terminal of the first electronic switch is coupled to the enable pin of the storage extended chip.
8. An electronic device comprising a backboard, the backboard comprising:
a storage extended chip comprising an enable pin, an input pin, and an output pin;
a serial attached small computer system interface (SAS) hard disk drive (HDD) connector comprising a plurality of input pins and a plurality of ground pins, and a data output, the plurality of ground pins further comprising a first ground pin;
a convertor comprising an input pin, an enable pin, and an output pin, wherein the input pin of the convertor is coupled to the plurality of input pins of the SAS HDD, to receive data from the data output; and
an election unit comprising an input terminal, a first election unit, and a second election unit, wherein the first election unit is coupled to the first ground pin of the SAS HDD connector, the enable pin of the convertor, and the enable pin of the storage extended chip, the second election unit is coupled to the first ground pin of the SAS HDD connector and the enable pin of the storage extended chip;
wherein the second election unit includes a first electronic switch and a first resistor, a first terminal of the first electronic switch is coupled to the input terminal of the election unit, and is coupled to the power source terminal through the first resistor; a second terminal of the first electronic switch is grounded; a third terminal of the first electronic switch is coupled to the power source terminal.
9. The electronic device of claim 8 , wherein when the SAS HDD connector is coupled to a SATA HDD, the first ground pin of the SAS HDD connector outputs a digital high level signal to the input terminal of the election unit, the first election unit operates, the second election does not operate, the first election unit outputs a first control signal to the enable pin of the convertor and the enable pin of the storage extended chip, the storage extended chip operates and receives a SAS signal from the SAS HDD connector.
10. The electronic device of claim 9 , wherein when the SAS HDD connector is coupled to a SAS HDD, the first ground pin of the SAS HDD connector is grounded, and outputs a digital low level signal to the input terminal of the election unit, the first election unit does not operate, the second election unit operates, the second election unit outputs a second control signal to the enable pin of the storage extended chip, the storage extended chip operates and receives a SAS signal from the SAS HDD connector.
11. The electronic device of claim 10 , wherein the first election unit comprises a second electronic switch and a second resistor, a first terminal of the second electronic switch is coupled to a first input pin of the SAS HDD connector, and is coupled to the first power source terminal through the second resistor; a second terminal of the second electronic switch is grounded; a third terminal of the second electronic switch is coupled to the power source terminal, and is coupled to the enable pins of the convertor and the storage extended chip.
12. The electronic device of claim 11 , wherein the first electronic switch is an npn bipolar junction transistor (BJT), the first to third terminals of the npn BJT correspond to a base, an emitter, and a collector of the BJT, respectively.
13. The electronic device of claim 12 , wherein the second electronic switch is a pnp bipolar junction transistor (BJT), the first to third terminals of the pnp BJT correspond to a base, an emitter, and a collector of the BJT, respectively.
14. The electronic device of claim 8 , wherein the third terminal of the first electronic switch is coupled to the enable pin of the storage extended chip.