參數(shù)資料
型號: UPD720130
廠商: NEC Corp.
英文描述: USB2.0 to IDE Bridge
中文描述: USB2.0轉(zhuǎn)IDE橋
文件頁數(shù): 11/44頁
文件大?。?/td> 316K
代理商: UPD720130
Data Sheet S16302EJ3V0DS
11
μ
PD720130
2.4
Combo Mode Function
The
μ
PD720130 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
μ
PD720130 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
Other IDE controller
IDE Bus Request
μ
PD720130
CMB_STATE
CMB_BSY
IDE Bus Grant
Table 2-5. Description of CMB_BSY and CMB_STATE
Pin Name
Direction
Value
Description
0
Other IDE controller does not require or does not use IDE bus.
CMB_STATE
IN
1
Other IDE controller requires or is using IDE bus.
0
The
μ
PD720130 does not require or does not use IDE bus.
CMB_BSY
OUT
1
The
μ
PD720130 requires or is using IDE bus.
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