Rainbow-electronics W90P710CDG Manual do Utilizador descarregar pdf (Página 195)

100

101

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)

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

1 2 ... 190 191 192 193 194 195 196 197 198 199 200 ... 551 552

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