ISP1161A1 datasheet(24/136 Pages) PHILIPS

Part #	ISP1161A1

Description	Universal Serial Bus single-chip host and device controller

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

ISP1161A1

USB single-chip host and device controller

Product data

Rev. 03 — 23 December 2004

24 of 136

9397 750 13961

9.

USB host controller (HC)

9.1 HC’s four USB states

The ISP1161A1 USB HC has four USB states

− USBOperational, USBReset,

USBSuspend, and USBResume

− that deﬁne the HC’s USB signaling and bus states

responsibilities.

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 Host Controller Driver (HCD) can perform only the USB state transitions shown

in Figure 23.

Remark: The Software Reset in Figure 23 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 ISP1161A1 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 24. For more detail, refer to the

USB Speciﬁcation Revision 2.0 about the

protocol and ISP1161A1 USB HC register usage.

Fig 23. ISP1161A1 HC USB states.

MGT947

USBOperational

USBSuspend

USBResume

USBResume write

or

remote wake-up

USBReset

USBOperational write

USBSuspend write

USBReset write

hardware or software

reset

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