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Document #: 38-08022 Rev. *C Page 35 of 49

Control Read

ACK IN/Status OUT

1 1 1 1 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

1 1 1 1 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 1 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 1 IN x UC x UC UC UC UC 1 UC 1 1 1 1 0 ACK (back) yes

NAK IN/Status OUT

1 1 1 0 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

1 1 1 0 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

3 2 1 0 token count buffer dval DTOG DVAL COUNT SETUP IN OUT ACK 3 2 1 0 response int

1 1 1 0 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 0 IN x UC x UC UC UC UC 1 UC UC NoChange NAK yes

Status OUT Only

0 0 1 0 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

0 0 1 0 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

0 0 1 0 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

0 0 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 0 IN x UC x UC UC UC UC 1 UC UC 0 0 1 1 STALL yes

OUT Endpoint

ACK OUT, STALL Bit = 0 (Figure 14-3)

1 0 0 1 OUT <= 10 data valid updates 1 updates UC UC 1 1 1 0 0 0 ACK yes

1 0 0 1 OUT > 10 junk x updates updates updates UC UC 1 UC NoChange Ignore yes

1 0 0 1 OUT x junk invalid updates 0 updates UC UC 1 UC NoChange Ignore yes

1 0 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

ACK OUT, STALL Bit = 1 (Figure 14-3)

1 0 0 1 OUT <= 10 UC valid UC UC UC UC UC 1 UC NoChange STALL yes

1 0 0 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

NAK OUT

1 0 0 0 OUT <= 10 UC valid UC UC UC UC UC 1 UC NoChange NAK yes

1 0 0 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 0 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

Reserved

0 1 0 1 OUT x updates updates updates updates updates UC UC 1 1 NoChange RX yes

0 1 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

IN Endpoint

ACK IN, STALL Bit = 0 (Figure 14-3)

1 1 0 1 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 0 1 IN x UC x UC UC UC UC 1 UC 1 1 1 0 0 ACK (back) yes

ACK IN, STALL Bit = 1 (Figure 14-3)

1 1 0 1 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 0 1 IN x UC x UC UC UC UC 1 UC UC NoChange STALL yes

NAK IN

Table 22-3. Details of Modes for Differing Traffic Conditions (continued)