AN2131-DK001 Cypress Semiconductor Corp, AN2131-DK001 Datasheet - Page 237

• 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

The 8051 sets VAL=1 for any active endpoints, and VAL=0 for inactive endpoints. These
bits instruct the EZ-USB core to return a “no response” if an invalid endpoint is addressed,
instead of a NAK.
The default values of these registers are set to support all endpoints that exist in the default
USB device (see Table 5-1).
Page 12-44
IN07VAL
OUT07VAL
OUT7VAL
IN7VAL
R/W
R/W
b7
b7
0
0
OUT6VAL
IN6VAL
R/W
R/W
b6
b6
1
1
OUT5VAL
IN5VAL
R/W
R/W
b5
b5
Figure 12-36. IN/OUT Valid Bits Register
0
0
Endpoints 0-7 OUT Valid Bits
Endpoints 0-7 IN Valid Bits
Chapter 12. EZ-USB Registers
OUT4VAL
IN4VAL
R/W
R/W
b4
b4
1
1
OUT3VAL
IN3VAL
R/W
R/W
b3
b3
0
0
OUT2VAL
IN2VAL
R/W
R/W
b2
b2
1
1
OUT1VAL
IN1VAL
R/W
R/W
b1
b1
1
0
EZ-USB TRM v1.9
OUT0VAL
IN0VAL
R/W
R/W
7FDE
b0
b0
7FDF
1
1