UPD720133 Просмотр технического описания (PDF) - NEC => Renesas Technology

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производитель

UPD720133

USB2.0 to IDE Bridge

NEC => Renesas Technology 

µPD720133

The IDE bus arbitration will be performed in the following sequence. The µPD720133 will check if the other

IDE controller is using the IDE bus. If the other IDE controller is not using the IDE bus, the µPD720133 will be

able to use the IDE bus. On the other hand, if the other IDE controller is using the IDE bus, the µPD720133

transmits to the suspend mode. And the µPD720133 resumes on condition that the CMB_STATE becomes low

level. After that, the arbitration will restart from the beginning of the sequence.

Figure 2-2. IDE Bus Arbitration Sequence

START

Chip Init

B

END

PWR = 0 & CLC = 1 ?

Yes

No

A

Yes

The other IDE controller is

using IDE bus.

CMB_STATE = 1 ?

No

CMB_BSY = 1

Yes

The µPD720133 uses

IDE bus.

CMB_STATE = 0 ?

No

END

CMB_BSY = 0

A

A

Suspend Mode

CMB_STATE = 1 ?

Yes

No

Resume

The other IDE controller

is still using IDE bus.

The other IDE controller

releases IDE bus.

B

The µPD720133

cannot use IDE bus.

10

Preliminary Data Sheet S17100EJ2V0DS

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