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參數資料
| 型號： | ISD-300A1 |
| 英文描述： | Universal Serial Bus |
| 中文描述： | 通用串行總線 |
| 文件頁數： | 44/67頁 |
| 文件大?。?/td> | 580K |
| 代理商： | ISD-300A1 |
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ISD-300A1
39
October 19, 2001
DRV_PWR_VALID Pin
The DRV_PWR_VALID input pin is typically enabled only in Hybrid powered systems, or systems in which
the ISD-300A1 receives power from VBUS, and the device receives power from another source
. In VBUS
or self powered systems DRV_PWR_VALID is typically not utilized. In Hybrid powered systems,
DRV_PWR_VALID indicates if the device is powered or at least attached and qualifies device operation
.
DRV_PWR_VALID active polarity and enabling is controlled during ISD-300A1 configuration. It is
active high in systems that can supply a power indication from the drive. It is active low in systems that
utilize a “grounding scheme” to indicate when the cable is connected to the device. If enabled, and
DRV_PWR_VALID is not determined active after the ISD-300A1 configuration data is loaded, the ISD-
300A1 enters a low power mode of operation (similar to USB suspend state when in VBUS powered
operation. See
Table 21 – ATA Interface Line States
on page 40 for more information). Asserting
DRV_PWR_VALID enables resume from the low power operation state.
This signal may also be used in conjunction with ATA_EN to force the ISD-300A1 to disable the USB
interface and operate in a low power state when sharing the ATA interface.
VBUS_PWR_VALID Pin
This input pin indicates that VBUS power is present at the USB connector
.
VBUS_PWR_VALID qualifies
driving the system’s 1.5K ohm pull-up resistor on D+ when the system is externally powered (the USB
specification only allows the device to source power to D+ when the host is powered). After the ISD-
300A1 configuration data is loaded, if VBUS_PWR_VALID is inactive the ISD-300A1 enters a low power
mode of operation. Asserting VBUS_PWR_VALID resumes operation from the low power state.
DISK_READY Pin
This input pin indicates the attached device is powered and ready to begin communication with the ISD-
300A1. DISK_READY qualifies the start of the ISD-300A1’s initialization sequence. A state change from
0 to 1 on DISK_READY will cause the ISD-300A1 to wait for 25 ms before asserting NATA_RESET and
re-initialize the device. The ATA interface state machines remain inactive and all of the ATA interface
signals are driven logic ‘0’ if DISK_READY is not asserted (assuming ATA_EN = ‘1’). This input is not
used in conjunction with DRV_PWR_VALID, and should be tied to logic ‘1’ in hybrid powered systems.
DISK_READY is filtered for 25 ms on the rising edge and cleared asynchronously on the falling edge.
NLOWPWR Pin
When active, the NLOWPWR pin indicates the ISD-300A1 is operating in a low power state.
NPWR500 Pin
The NPWR500 output pin indicates the USB host has configured the ISD-300A1 USB interface for VBUS
powered operation (VBUS_POWERED pin active), granting the requested amount of power for the
peripheral (the bMaxPower entry from descriptor set 1). In the case of a USB suspend condition,
NPWR500 is de-asserted and the ISD-300A1 enters a low power state of operation. Upon a resume
condition, the ISD-300A1 will resume normal operation and restore NPWR500 accordingly
.
Note: ISD-
300A1 power sources should not be controlled at any time by using the NPWR500 pin.
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