Rainbow Electronics W90P710CDG - Manual (Page 195)

W90P710CD/W90P710CDG
Publication Release Date: September 19, 2006
- 195 - Revision B2
6.8.1 USB Endpoints
It consists of four endpoints, designated EP0, EPA, EPB and EPC. Each is intended for a particular
use as described below:
EP0: the default endpoint uses control transfer (In/Out) to handle configuration and control functions
required by the USB specification. Maximum packed size is 16 bytes.
EPA: designed as a general endpoint. This endpoint could be programmed to be an Interrupt IN
endpoint or an Isochronous IN endpoint or a Bulk In endpoint or Bulk OUT endpoint.
EPB: designed as a general endpoint. This endpoint could be programmed to be an Interrupt IN
endpoint or an Isochronous IN endpoint or a Bulk In endpoint or Bulk OUT endpoint.
EPC: designed as a general endpoint. This endpoint could be programmed to be an Interrupt IN
endpoint or an Isochronous IN endpoint or a Bulk In endpoint or Bulk OUT endpoint.
6.8.2 Standard device request
The USB controller has built-in hard-wired state machine to automatically respond to USB standard
device request. It also supports to detect the class and vendor requests. For Get Descriptor request
and Class or Vendor command, the firmware will control these procedures.
6.8.3 USB Device Register Description
USB Control Register (USB_CTL)
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
USB_CTL 0xFFF0_6000 R/W USB control register 0x0000_0000
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved WakeUp
7 6 5 4 3 2 1 0
CCMD VCMD SIE_RCV SUS_TST RWU_EN SUSP USB_RST USB_EN