EZ-USB Datasheet, PDF (79/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

5.3 EZ-USB Core Response to EP0 Device Requests
Table 5-2 shows how the EZ-USB core responds to endpoint zero requests when
ReNum=0.
Table 5-2. How the EZ-USB Core Handles EP0 Requests When ReNum=0
bRequest
Name
Action: ReNum=0
0x00 Get Status/Device
Returns two zero bytes
0x00 Get Status/Endpoint Supplies EP Stall bit for indicated EP
0x00 Get Status/Interface Returns two zero bytes
0x01 Clear Feature/Device None
0x01 Clear Feature/Endpoint Clears Stall bit for indicated EP
0x02 (reserved)
None
0x03 Set Feature/Device None
0x03 Set Feature Endpoint Sets Stall bit for indicated EP
0x04 (reserved)
None
0x05 Set Address
Updates FNADD register
0x06 Get Descriptor
Supplies internal table
0x07 Set Descriptor
None
0x08 Get Configuration
Returns internal value
0x09 Set Configuration
Sets internal value
0x0A Get Interface
Returns internal value (0-3)
0x0B Set Interface
Sets internal value (0-3)
0x0C Sync Frame
None
Vendor Requests
0x0A Firmware Load
Upload/Download RAM
0xA1-0xAF Reserved
Reserved by Cypress Semiconductor
all other
None
The USB host enumerates by issuing:
• Set_Address
• Get_Descriptor
• Set_Configuration (to 1)
Page 5-4
Chapter 5. EZ-USB CPU
EZ-USB TRM v1.9