The following table illustrates the major differences between USB 1.1 and USB 2.0. For further details, refer to the actual specifications.

 

KEY USB1.1 USB2.0 (HS Capability)
Signal 3.3V Differential 12/1.5Mbps 400mV Differential 480Mbps
Idle J - state SE0 (D + = D - Low)
SYNC 8 symbols 32 (12 min) symbols
EOP 2 X SE0 + J "0" + 7 "1" (39"1" for SOF)
Connect Position of pull-up R. FS->HS
Disconnect SE0 Voltage level of SOF EOP
Reset Long SE0 Long SE0 with chirp
Transaction SOF, Setup, In, Out SOF, Setup, In, Out, Ping, Split
Control 8, 16, 32, 64 byte 64 byte
Bulk 8, 16, 32, 64 byte 512byte
Interrupt 1 - 64 byte 1 - 1024 byte (1024 × 3 MAX )
Iso. 1 - 1023 byte 1 - 1024 byte (1024 × 3 MAX )
Get Desc. Device, Configuration Dev., Config., Qualifier, Other