Fujitsu MHY2120BH Command Protocol, Execute Device Diagnostic Initialize Device Parameters, Data

Interface

5.4 Command Protocol

The host should confirm that the BSY bit of the Shadow Block Status register of the device is 0 prior to issue a command. If BSY bit is 1, the host should wait for issuing a command until BSY bit is cleared to 0.

Commands can be executed only when the DRDY bit of the Status register is 1. However, the following commands can be executed even if DRDY bit is 0.

•EXECUTE DEVICE DIAGNOSTIC

•INITIALIZE DEVICE PARAMETERS

Note: Each FIS type is referred to as follows in this section.

FIS (Frame Information Structure) type

Register - Host to Device

Register - Device to Host

DMA Active - Device to Host

DMA Setup - Device to Host or Host to Device (Bidirectional)

Set Device Bits - Device to Host

BIST Active - Bidirectional

PIO Setup - Device to Host

Data - Host to Device or Device to Host (Bidirectional)

Abbreviation

RegHD

RegDH

DMA Active

DMA Setup

SetDB

BIST Active

PIO Setup

DATA

5-174 C141-E262