UPD720130GC-9EU-SIN 查看數據表（PDF） - NEC => Renesas Technology

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UPD720130GC-9EU-SIN

USB2.0 to IDE Bridge

NEC => Renesas Technology 

µPD720130

2.4 Combo Mode Function

The µPD720130 can be used to realize that two IDE controller chips control one target IDE device in one

system. To realize IDE bus arbitration between two IDE controller chips, the µPD720130 has CMB_BSY and

CMB_STATE. Combo mode is enabled when PWR = 0 and CLC = 1.

CMB_BSY and CMB_STATE connect to other IDE controller chip as follows.

Figure 2-1. CMB_BSY and CMB_STATE Connection between Two IDE Controller Chips

µ PD720130

Other IDE controller

CMB_STATE

CMB_BSY

IDE Bus Grant

IDE Bus Request

Pin Name

CMB_STATE

CMB_BSY

Table 2-5. Description of CMB_BSY and CMB_STATE

Direction

IN

OUT

Value

0

1

0

1

Description

Other IDE controller does not require or does not use IDE bus.

Other IDE controller requires or is using IDE bus.

The µPD720130 does not require or does not use IDE bus.

The µPD720130 requires or is using IDE bus.

Data Sheet S16302EJ3V0DS

11

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