BenutzerhandbuchInhaltsverzeichnisTable of Contents3Preface61 Introduction71.1 Purpose of the Peripheral72 Architecture82.1 USB1 Module Clock and Reset82.1.1 Internal System Bus Clocks Needed by the USB1 Module82.1.2 USB1 Module Local Bus Clock and Local Reset82.1.3 USB1 Module Bus 48-MHz Reference Clock82.2 USB1 Module Open Host Controller Interface Functionality92.2.1 OHCI Controller Overview92.3 USB1 Module Differences From OHCI Specification for USB92.3.1 Power Switching Output Pins Not Supported92.3.2 Overcurrent Protection Input Pins Not Supported92.3.3 No Ownership Change Interrupt92.4 Implementation of OHCI Specification for USB102.4.1 USB Host Controller Endpoint Descriptor (ED) List Head Pointers102.4.2 OHCI USB Suspend State102.5 OHCI Interrupts112.6 USB Host Controller Access to System Memory112.7 Physical Addressing113 Registers123.1 OHCI Revision Number Register (HCREVISION)133.2 HC Operating Mode Register (HCCONTROL)133.3 HC Command and Status Register (HCCOMMANDSTATUS)153.4 HC Interrupt and Status Register (HCINTERRUPTSTATUS)163.5 HC Interrupt Enable Register (HCINTERRUPTENABLE)173.6 HC Interrupt Disable Register (HCINTERRUPTDISABLE)183.7 HC HCAA Address Register (HCHCCA)193.8 HC Current Periodic Register (HCPERIODCURRENTED)193.9 HC Head Control Register (HCCONTROLHEADED)203.10 HC Current Control Register (HCCONTROLCURRENTED)213.11 HC Head Bulk Register (HCBULKHEADED)223.12 HC Current Bulk Register (HCBULKCURRENTED)223.13 HC Head Done Register (HCDONEHEAD)233.14 HC Frame Interval Register (HCFMINTERVAL)233.15 HC Frame Remaining Register (HCFMREMAINING)243.16 HC Frame Number Register (HCFMNUMBER)243.17 HC Periodic Start Register (HCPERIODICSTART)253.18 HC Low-Speed Threshold Register (HCLSTHRESHOLD)263.19 HC Root Hub A Register (HCRHDESCRIPTORA)273.20 HC Root Hub B Register (HCRHDESCRIPTORB)283.21 HC Root Hub Status Register (HCRHSTATUS)293.22 HC Port 1 Status and Control Register (HCRHPORTSTATUS1)303.23 HC Port 2 Status and Control Register (HCRHPORTSTATUS2)32Größe: 296 KBSeiten: 34Language: EnglishHandbuch öffnen