Allwinner A20 - EHCI Register Description

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 659 / 812
Register Name
Offset
Description
EHCI Capability Register
E_CAPLENGTH
0x000
EHCI Capability register Length Register
E_HCIVERSION
0x002
EHCI Host Interface Version Number Register
E_HCSPARAMS
0x004
EHCI Host Control Structural Parameter Register
E_HCCPARAMS
0x008
EHCI Host Control Capability Parameter Register
E_HCSPPORTROUTE
0x00c
EHCI Companion Port Route Description
EHCI Operational Register
E_USBCMD
0x010
EHCI USB Command Register
E_USBSTS
0x014
EHCI USB Status Register
E_USBINTR
0x018
EHCI USB Interrupt Enable Register
E_FRINDEX
0x01c
EHCI USB Frame Index Register
E_CTRLDSSEGMENT
0x020
EHCI 4G Segment Selector Register
E_PERIODICLISTBASE
0x024
EHCI Frame List Base Address Register
E_ASYNCLISTADDR
0x028
EHCI Next Asynchronous List Address Register
E_CONFIGFLAG
0x050
EHCI Configured Flag Register
E_PORTSC
0x054
EHCI Port Status/Control Register
6.8.5. EHCI Register Description
6.8.5.1. EHCI IDENTIFICATION REGISTER
Offset:0x00
Register Name: CAPLENGTH
Default Value: Implementation Dependent
Bit
Read/Write
Default
Description
7:0
R
0x10
CAPLENGTH
The value in these bits indicates an offset to add to register
base to find the beginning of the Operational Register Space.