ISD-300A1 Cypress Semiconductor Corp, ISD-300A1 Datasheet - Page 47

• Manufacturer Part Number: ISD-300A1
• Description: IC USB 2.0 BRIDGE BULK 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of ISD-300A1

• Applications: USB 2.0 to ATA/ATAPI Bridge
• Interface: ATA, ATAPI
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 100-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1459

October 19, 2001
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.
NAK Request
No
Return Interrupt Data
Set Int_Data = 0
USB Interrupt
Int_Data = 1?
Pipe Polled?
Yes
Yes
No
42
Yes
No
Latch State of IO Pins
Set Int_Data = 1
SYS_IRQ=1?
SYS_IRQ=0?
Int_Data = 0
Yes
and
ISD-300A1
No