Intel® IXP43X Product Line of Network
3.7.1Signal Interface
Table 13. | USB Host Signal Recommendations | |||
Name |
| Type | Pull |
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| Up/ | Description | ||
| Field | |||
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| Down |
| |
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| |
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| Positive signal of the differential USB receiver/driver for the USB host interface. |
|
|
|
| Use an 20Ω series termination resistor at the source. |
USB_P0_POS |
| I/O | Yes | When this interface/signal is enabled and is not being used in a system design, the |
| interface/signal should be pulled low with a | |||
|
|
|
| disabled through the USB Device soft fuse and is not being used in a system design, it |
|
|
|
| is not required for any connection. Refer to Expansion Bus Controller chapter of the |
|
|
|
| Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
|
|
|
| Negative signal of the differential USB receiver/driver for the USB host interface. |
|
|
|
| Use an 20Ω series termination resistor at the source. |
USB_P0_NEG |
| I/O | Yes | When this interface/signal is enabled and is not being used in a system design, the |
| interface/signal should be pulled low with a | |||
|
|
|
| disabled through the USB Device soft fuse and is not being used in a system design, it |
|
|
|
| is not required for any connection. Refer to Expansion Bus Controller chapter of the |
|
|
|
| Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
USB_P0_PWREN |
| O | No | Enables the external VBUS power source. |
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|
|
| External VBUS power is in over current condition |
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|
|
| When this interface/signal is enabled and is not being used in a system design, the |
USB_P0_OC |
| I | No | interface/signal should be pulled low with a |
| disabled through the USB Device soft fuse and is not being used in a system design, it | |||
|
|
|
| |
|
|
|
| is not required for any connection. Refer to Expansion Bus Controller chapter of the |
|
|
|
| Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
|
|
|
| Positive signal of the differential USB receiver/driver for the USB host interface. |
|
|
|
| Use an 20Ω series termination resistor at the source. |
USB_P1_POS |
| I/O | Yes | When this interface/signal is enabled and is not being used in a system design, the |
|
|
|
| interface/signal should be pulled low with a |
|
|
|
| disabled through the USB Device soft fuse. Refer to Expansion Bus Controller chapter |
|
|
|
| of the Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
|
|
|
| Negative signal of the differential USB receiver/driver for the USB host interface. |
|
|
|
| Use an 20Ω series termination resistor at the source. |
USB_P1_NEG |
| I/O | Yes | When this interface/signal is enabled and is not being used in a system design, the |
| interface/signal should be pulled low with a | |||
|
|
|
| disabled through the USB Device soft fuse and is not being used in a system design, it |
|
|
|
| is not required for any connection. Refer to Expansion Bus Controller chapter of the |
|
|
|
| Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
USB_P1_PWREN |
| O | No | Enable the external VBUS power source. |
|
|
|
|
|
|
|
|
| External VBUS power is in over current condition |
|
|
|
| When this interface/signal is enabled and is not being used in a system design, the |
USB_P1_OC |
| I | No | interface/signal should be pulled low with a |
| disabled through the USB Device soft fuse and is not being used in a system design, it | |||
|
|
|
| |
|
|
|
| is not required for any connection. Refer to Expansion Bus Controller chapter of the |
|
|
|
| Intel® IXP43X Product Line of Network Processors Developer’s Manual. |
A typical implementation of a USB interface Host
Note: Depending on the data rate required,
Speed configuration at the Device can be set as stated in note 1 and 2 below. For more details, refer to the Universal Serial Bus Specification, Revision 2.0.
Note:
1.If a
Intel® IXP43X Product Line of Network Processors |
|
HDG | April 2007 |
34 | Document Number: 316844; Revision: 001US |
