Fujitsu MHU2100AT, Product Manual

Page: 202 / 278

Interface
5-126 C141-E202-01EN
5.4 Command Protocol
The host should confirm that the BSY bit of the 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
5.4.1 PIO Data transferring commands from device to host
The execution of the following commands involves data transfer from the device
to the host.
•
READ SECTOR (S) (EXT)
•
READ LONG
•
SMART READ DATA
•
SMART READ LOG
•
DEVICE CONFIGURATION IDENTIFY
•
READ BUFFER
•
IDENTIFY DEVICE
•
READ LOG EXT
The execution of these commands includes the transfer one or more sectors of
data from the device to the host. In the READ LONG command, 516 bytes are
transferred. Following shows the protocol outline.
a) The host writes any required parameters to the Features, Sector Count, Sector
Number, Cylinder, and Device/Head registers.
b) The host writes a command code to the Command register.
c) The device sets the BSY bit of the Status register and prepares for data
transfer.
d) When one sector of data is available for transfer to the host, the device sets
DRQ bit and clears BSY bit. The drive then asserts INTRQ signal.
e) After detecting the INTRQ signal assertion, the host reads the Status register.
The host reads one sector of data via the Data register. In response to the
Status register being read, the device negates the INTRQ signal.