CY7C64013
CY7C64113
Document #: 38-08001 Rev. **
Page 36 of 48
19.0
USB Mode Tables
The ‘In’ column represents the SIE’s response to the token type.
A disabled endpoint remains disabled until it is changed by firmware, and all endpoints reset to the disabled state.
Any SETUP packet to an enabled endpoint with mode set to accept SETUPs is changed by the SIE to 0001 (NAKing). Any mode
set to accept a SETUP, ACKs a valid SETUP transaction.
Most modes that control transactions involving an ending ACK, are changed by the SIE to a corresponding mode which NAKs
subsequent packets following the ACK. Exceptions are modes 1010 and 1110.
A Control endpoint has three extra status bits for PID (Setup, In and Out), but must be placed in the correct mode to function as
such. Non-Control endpoints should not be placed into modes that accept SETUPs.
A ‘check’ on an Out token during a Status transaction checks to see that the Out is of zero length and has a Data Toggle (DTOG)
of ‘1’. If the DTOG bit is set and the received Out Packet has zero length, the Out is ACKed to complete the transaction. Otherwise,
the Out is STALLed.
Note:
3.
STALL bit is bit 7 of the USB Non-Control Device Endpoint Mode registers. For more information, refer to Section 18.4.
Table 19-1. USB Register Mode Encoding
Mode
Encoding
Setup
In
Out
Comments
Disable
0000
ignore
ignore
ignore
Ignore all USB traffic to this endpoint
Nak In/Out
0001
accept
NAK
NAK
Forced from Set-up on Control endpoint, from modes other
than 0000
Status Out Only
0010
accept
stall
check
For Control endpoints
Stall In/Out
0011
accept
stall
stall
For Control endpoints
Ignore In/Out
0100
accept
ignore
ignore
For Control endpoints
Isochronous Out
0101
ignore
ignore
always
For Isochronous endpoints
Status In Only
0110
accept
TX 0
stall
For Control Endpoints
Isochronous In
0111
ignore
TX cnt
ignore
For Isochronous endpoints
Nak Out
1000
ignore
ignore
NAK
An ACK from mode 1001 --> 1000
Ack Out(STALL[3]=0)
Ack Out(STALL[3]=1)
1001
1001
ignore
ignore
ignore
ignore
ACK
stall
This mode is changed by SIE on issuance of ACK --> 1000
Nak Out - Status In
1010
accept
TX 0
NAK
An ACK from mode 1011 --> 1010
Ack Out - Status In
1011
accept
TX 0
ACK
This mode is changed by SIE on issuance of ACK --> 1010
Nak In
1100
ignore
NAK
ignore
An ACK from mode 1101 --> 1100
Ack IN(STALL[3]=0)
Ack IN(STALL[3]=1)
1101
1101
ignore
ignore
TX cnt
stall
ignore
ignore
This mode is changed by SIE on issuance of ACK --> 1100
Nak In - Status Out
1110
accept
NAK
check
An ACK from mode 1111 --> 111 Ack In - Status Out
Ack In - Status Out
1111
accept
TX cnt
check
This mode is changed by SIE on issuance of ACK -->1110
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