Rainbow Electronics W90P710CDG User 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