EZ-USB Datasheet, PDF (238/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

INISOVAL
Isochronous IN Endpoint Valid Bits
7FE0
b7
IN15VAL
R/W
0
b6
IN14VAL
R/W
0
b5
IN13VAL
R/W
0
b4
IN12VAL
R/W
0
b3
IN11VAL
R/W
0
b2
IN10VAL
R/W
1
b1
IN9VAL
R/W
1
b0
IN8VAL
R/W
1
OUTISOVAL
Isochronous OUT Endpoint Valid Bits
7FE1
b7
b6
b5
b4
b3
b2
b1
b0
OUT15VAL OUT14VAL OUT13VAL OUT12VAL OUT11VAL OUT10VAL OUT9VAL OUT8VAL
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
1
1
1
Figure 12-37. Isochronous IN/OUT Endpoint Valid Bits Register
The 8051 sets VAL=1 for 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.
The default values of these registers are set to support all endpoints that exist in the default
USB device (see Table 5-1).
EZ-USB TRM v1.9
Chapter 12. EZ-USB Registers
Page 12-45