EW31244SL7QV Datasheet, PDF (51/252 Pages) Intel Corporation – Intel® 31244 PCI-X to Serial ATA Controller

Intel^® 31244 PCI-X to Serial ATA Controller
Functional Blocks
Figure 17.
COMRESET is used by the controller to achieve two things:
• Initialize the serial bus to establish the communication link
• Hardware reset the device
Because of the nature of the serial bus, the serial bus has to be initialized before communication
between the controller and the device may occur. The controller initiates a COMRESET on the
serial bus to begin the initialization sequence. After the initialization sequence is completed, the
communication link between the controller and the device is established and normal operation may
begin. COMRESET is also used to cause a hardware reset of the device. Figure 17 shows a
COMRESET sequence.
COMRESET Sequence
Developer’s Manual
April 2004
51