5 4- . D+ D- . 0,3 ( ) 2,8 ( ).
USB 1.0 USB 2.0 : 90 5; 3. . ; .
USB 1.0 USB 2.0 (. 27.1 . 27.2).
27.1
VBus | D+ | ||
D- | GND |
. 27.2. USB: - "", - "", -
"" (Upstream Connector). , (, , . .). (Downstream Port) .
"" (Downstream Connector) , ( ). () , "".
"" "" , . , . . USB .
USB . USB (-) . , , , . , .