( ) USB. USB :
;
;
() .
-, USB . . , 27.2.
27.2.
| Token | IN, OUT, SOF, SETUP |
| Data | DATA0, DATA1 |
| Handshake | ACK, NAK, STALL |
| Special | PRE |
(Token Packet), () USB, :
USB;
() ;
, (IN, OUT, SOF, SETUP);
.
IN , () (-). - IN (), DATA , , .
OUT , (-) . - OUT . DATA.
SETUP CONTROL. , () (-) . - SETUP, . DATA.
SOF ( 12.5 /), USB.
: ACK, NAK STALL:
ACK - , ;
NAK- , , , , .
STALL - , (, ). STALL, , .
