INISOVAL
Isochronous IN Endpoint Valid Bits
7FE0
b7
b6
b5
b4
b3
b2
b1
b0
IN15VAL
IN14VAL
IN13VAL
IN12VAL
IN11VAL
IN10VAL
IN9VAL
IN8VAL
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
1
R/W
1
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
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
1
R/W
1
R/W
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
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