Ngwa ngwa njikọ USB na-ahụkarị nwere eriri USB, ngwaọrụ USB na eriri USB.N'ime usoro ụgbọ ala USB, ngwaọrụ ndị dị n'èzí na-ejikọta ọnụ dị ka ngwaọrụ USB, nke na-emecha arụ ọrụ kpọmkwem, dị ka diski U disk, diski ike mkpanaka, òké, keyboard, njikwa egwuregwu, wdg. USB host bụ onye nwe usoro ahụ. ma na-ahụ maka njikwa na nhazi data na usoro nkwurịta okwu USB.N'oge nnyefe nke njikọ USB, a na-akpọ nnyefe data sitere na USB host na ngwaọrụ USB nkwurịta okwu Down Stream, na nnyefe data sitere na USB ngwaọrụ na USB host ka a na-akpọ Up Stream Communication.
Yiri na nhazi ihe owuwu nke Ethernet, sistemu bọs nke njikọ USB nwekwara usoro dị larịị doro anya.Ya bụ, enwere ike kewaa sistemu ngwa USB zuru oke na oyi akwa ọrụ, oyi akwa ngwaọrụ na oyi akwa interface ụgbọ ala.
1. oyi akwa ọrụ.Ihe oyi akwa ọrụ na-ahụ maka nnyefe data n'etiti onye na-elekọta USB na ngwaọrụ dị na sistemụ ngwa njikọ USB, nke mejupụtara akụkụ ọrụ nke ngwaọrụ USB yana mmemme nnabata USB kwekọrọ.Ihe oyi akwa na-arụ ọrụ na-enye ụdị nnyefe data anọ, gụnyere Nfefe Njikwa, Nfefe buru ibu, Nfefe nkwụsị na Nyefe Isochronous.
2. Ngwá ọrụ oyi akwa.Na sistemụ njikọ USB, oyi akwa ngwaọrụ na-ahụ maka ijikwa ngwaọrụ USB, ekenye adreesị nke ngwaọrụ USB, na ịnweta nkọwa ngwaọrụ.Ọrụ nke oyi akwa ngwaọrụ chọrọ nkwado maka ndị ọkwọ ụgbọala, ngwaọrụ USB na ndị ọbịa USB.N'ime oyi akwa ngwaọrụ, onye ọkwọ ụgbọ ala nwere ike nweta ikike nke ngwaọrụ USB.
3. Bus interface oyi akwa.Ngwunye interface ụgbọ ala na-achọpụta oge nnyefe data USB na sistemụ njikọ USB.Mbufe data ụgbọ ala USB na-eji koodu NRZI, nke na-agbanwe anaghị alaghachi na nzuzo efu.N'ime oyi akwa njikọ ụgbọ ala eriri USB, onye na-ahụ maka USB na-eme ntinye koodu NRZI ma ọ bụ decoding na-akpaghị aka iji mezue usoro nnyefe data.A na-arụchakarị oyi akwa interface ụgbọ ala na-akpaghị aka site na ngwaike USB interface.
Oge nzipu: Mee-31-2021