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ISP1160

Embedded Universal Serial Bus Host Controller

Philips Electronics 

Philips Semiconductors

ISP1160

Embedded USB Host Controller

USBOperational

USBReset write

USBOperational write

USBOperational write

USBSuspend write

USBSuspend

USBResume

USBReset write

USBReset

USBResume write

or

remote wake-up

hardware or software

reset

USBReset write

MGT947

Fig 14. The ISP1160 HC’s USB states.

The USB states are reflected in the HostControllerFunctionalState field of the

HcControl register (01H to read, 81H to write), which is located at bits 7 and 6 of the

register.

The HCD can perform only the USB state transitions shown in Figure 14.

Remark: The Software Reset in Figure 14 is not caused by the HcSoftwareReset

command. It is caused by the HostControllerReset field of the HcCommandStatus

register (02H to read, 82H to write).

9.2 Generating USB traffic

USB traffic can be generated only when the ISP1160 USB HC is in the

USBOperational state. Therefore, the HCD must set the

HostControllerFunctionalState field of the HcControl register before generating USB

traffic.

A simplistic flow diagram showing when and how to generate USB traffic is shown in

Figure 15. For greater accuracy, refer to the Universal Serial Bus Specification

Rev. 2.0 for the USB protocol and the ISP1160 USB HC’s register usage.

9397 750 11371

Product data

Rev. 04 — 04 July 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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