LPC47B272-MS View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'LPC47B272-MS' PDF : 195 Pages View PDF
PHASE
Command
Execution
Result
READ ID
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
W 0 MFM 0 0 1 0
1
0 Commands
W 0 0 0 0 0 HDS DS1 DS0
The first correct ID
information on the
Cylinder is stored in
Data Register
R
──────── ST0 ────────
Status information after
Command execution.
R
──────── ST1 ────────
R
──────── ST2 ────────
R
──────── C ────────
R
──────── H ────────
R
──────── R ────────
R
──────── N ────────
PHASE
Command
PERPENDICULAR MODE
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1
D0
REMARKS
W
0 00100
1
0 Command Codes
OW 0 D3 D2 D1 D0 GAP WGATE
PHASE
Command
Result
INVALID CODES
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
W
───── Invalid Codes ─────
Invalid Command Codes
(NoOp - FDC goes into Stand-
by State)
R
─────── ST0 ───────
ST0 = 80H
PHASE
Command
Result
LOCK
DATA BUS
R/W
D7
D6 D5
D4
D3 D2 D1 D0
REMARKS
W LOCK 0 0
1
0 1 0 0 Command Codes
R
0
0 0 LOCK 0 0 0 0
SC is returned if the last command that was issued was the Format command. EOT is returned if the last command was
a Read or Write.
Note: These bits are used internally only. They are not reflected in the Drive Select pins. It is the user's responsibility to
maintain correspondence between these bits and the Drive Select pins (DOR).
DATA TRANSFER COMMANDS
All of the Read Data, Write Data and Verify type commands use the same parameter bytes and return the same results
information, the only difference being the coding of bits 0-4 in the first byte.
An implied seek will be executed if the feature was enabled by the Configure command. This seek is completely
transparent to the user. The Drive Busy bit for the drive will go active in the Main Status Register during the seek portion
of the command. If the seek portion fails, it is reflected in the results status normally returned for a Read/Write Data
command. Status Register 0 (ST0) would contain the error code and C would contain the cylinder on which the seek
failed.
Read Data
A set of nine (9) bytes is required to place the FDC in the Read Data Mode. After the Read Data command has been
issued, the FDC loads the head (if it is in the unloaded state), waits the specified head settling time (defined in the
Specify command), and begins reading ID Address Marks and ID fields. When the sector address read off the diskette
SMSC LPC47B27x
- 43 -
Rev. 04-17-07
DATASHEET
Share Link: 
