AN2131-DK001 Cypress Semiconductor Corp, AN2131-DK001 Datasheet - Page 133

• Manufacturer Part Number: AN2131-DK001
• Description: KIT EZ-USB DEVELOPMENT BOARD
• Manufacturer: Cypress Semiconductor Corp

Specifications of AN2131-DK001

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1333

7.3.3 Clear Feature
Clear Feature is used to disable remote wakeup or to clear a stalled endpoint.
If the USB device supports remote wakeup (as reported in its descriptor table when the
device is enumerated), the Clear_Feature/Remote Wakeup request disables the wakeup
capability.
The Clear_Feature/Stall removes the stall condition from an endpoint. The 8051 should
respond by clearing the stall bit in the indicated endpoint’s CS register.
7.3.4 Get Descriptor
During enumeration, the host queries a USB device to learn its capabilities and require-
ments using Get_Descriptor requests. Using tables of descriptors, the device sends back
Page 7-12
Byte
Byte
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
bmRequestType
bRequest
wValueL
wValueH
wIndexL
wIndexH
wLengthL
wLengthH
bmRequestType
bRequest
wValueL
wValueH
wIndexL
wIndexH
wLengthL
wLengthH
Table 7-8. Clear Feature-Device (Clear Remote Wakeup Bit)
Field
Field
Table 7-9. Clear Feature-Endpoint (Clear Stall)
Value
Value
0x00
0x01
0x01
0x02
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
EP
Chapter 7. EZ-USB CPU
OUT, Device
“Clear Feature”
Feature Selector:
Remote Wakeup
OUT, Endpoint
“Clear Feature”
Feature Selector:
STALL
Meaning
Meaning
Clear the remote wakeup bit
Clear the STALL bit for the
indicated endpoint:
EP(n):
0x00-0x07: OUT0-OUT7
0x80-0x87: IN0-IN7
8051 Response
8051 Response
EZ-USB TRM v1.9