為什麼EHCI用在USB,而AHCI用在SATA？

[mailrapid]

為什麼EHCI用在USB,而AHCI用在SATA？

在看任何一晶片組的datasheet裡面，都會這麼寫，可是，
EHCI或AHCI是專屬USB,SATA的嗎？

 

[praesepe]

YAP, 定義就是這樣, USB用EHCI, SATA用AHCI:

The Advanced Host Controller Interface (AHCI) specification describes the register-level interface for a Host Controller for Serial ATA.

The Enhanced Host Controller Interface (EHCI) specification describes the register-level interface for a Host Controller for the Universal Serial Bus (USB) Revision 2.0.