isp1160 NXP Semiconductors, isp1160 Datasheet - Page 17

• Manufacturer Part Number: isp1160
• Description: Isp1160 Embedded Universal Serial Bus Host Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13963
Product data
Fig 14. The ISP1160 HC’s USB states.
USBOperational write
9.2 Generating USB traffic
USBSuspend write
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
Remark: The Software Reset in
command. It is caused by the HostControllerReset field of the HcCommandStatus
register (02H to read, 82H to write).
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
Rev. 2.0 for the USB protocol and the ISP1160 USB HC’s register usage.
USBOperational
USBSuspend
15. For greater accuracy, refer to the Universal Serial Bus Specification
Rev. 05 — 24 December 2004
USBResume write
remote wake-up
USBResume
or
USBOperational write
Figure 14
is not caused by the HcSoftwareReset
USBReset write
USBReset write
USBReset write
Embedded USB Host Controller
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
hardware or software
USBReset
Figure
reset
ISP1160
MGT947
14.
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