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參數(shù)資料
型號(hào): ISD-300A1
英文描述: Universal Serial Bus
中文描述: 通用串行總線
文件頁數(shù): 47/67頁
文件大小: 580K
代理商: ISD-300A1
ISD-300A1
42
October 19, 2001
USB Interrupt
Pipe Polled
Yes
No
NAK Request
SYS_IRQ=1
Latch State of IO Pins
Set Int_Data = 1
Int_Data = 1
No
Return Interrupt Data
Set Int_Data = 0
Yes
Yes
No
Yes
Int_Data = 0
and
SYS_IRQ=0
No
Figure 4 – SYS_IRQ – USB Interrupt Pipe
ATA_EN Pin – ATA Interface Disabled
The ATA_EN pin allows ATA bus sharing with other host devices. Asserting ATA_EN low causes the
ISD-300A1 to 3-state all ATA bus interface pins hi-Z and suspend ATA state machine activity, otherwise
leaving the ISD-300A1 operational (USB operation continues). Asserting ATA_EN high resumes normal
operation.
To disable USB operation and the ATA interface, the DRIVE_PWR_VALID signal can be used in
conjunction with ATA_EN to force the ISD-300A1 into a low power state until normal operation is
resumed.
ATA_PU_EN Pin – ATA Interface Pull-up Resistor Source
This output provides control for the required host pull-up resistors on the ATA interface. ATA_PU_EN is
3-stated hi-Z when ATA_EN is low.
ATA_PD_EN Pin – ATA Interface Pull-down Resistor Sink
This output provides control for the required host pull-down resistors on the ATA interface. ATA_PD_EN
is 3-stated hi-Z when ATA_EN is low.
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