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LPC47M172_07 Datasheet

  • LPC47M172_07

  • SMSC Corporation [Advanced I/O Controller with Motherboard ...

  • 1113.49KB

  • SMSC   SMSC

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Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
PRETRK
- Pre-Compensation Set to Track 0
EIS
- Enable Implied Seek. When set to "1", the FDC will perform a Seek operation before executing a
read or write command. Defaults to no implied seek.
EFIFO
- A "1" disables the FIFO (default). This means data transfers are asked for on a byte-by-byte
basis. Defaults to "1", FIFO disabled. The threshold defaults to "1".
POLL
- Disable polling of the drives. Defaults to "0", polling enabled. When enabled, a single interrupt is
generated after a reset. No polling is performed while the drive head is loaded and the head unload delay
has not expired.
FIFOTHR
- The FIFO threshold in the execution phase of read or write commands. This is programmable
from 1 to 16 bytes. Defaults to one byte. A "00" selects one byte; "0F" selects 16 bytes.
PRETRK
- Pre-Compensation Start Track Number. Programmable from track 0 to 255. Defaults to track
0. A "00" selects track 0; "FF" selects track 255.
6.23
Version
The Version command checks to see if the controller is an enhanced type or the older type (765A). A
value of 90 H is returned as the result byte.
6.24
Relative Seek
The command is coded the same as for Seek, except for the MSB of the first byte and the DIR bit.
DIR
RCN
Head Step Direction Control
Relative Cylinder Number that determines how many tracks to step the head in or out from the
current track number.
DIR
0
1
ACTION
Step Head Out
Step Head In
The Relative Seek command differs from the Seek command in that it steps the head the absolute number
of tracks specified in the command instead of making a comparison against an internal register. The Seek
command is good for drives that support a maximum of 256 tracks. Relative Seeks cannot be overlapped
with other Relative Seeks. Only one Relative Seek can be active at a time. Relative Seeks may be
overlapped with Seeks and Recalibrates. Bit 4 of Status Register 0 (EC) will be set if Relative Seek
attempts to step outward beyond Track 0.
As an example, assume that a floppy drive has 300 useable tracks. The host needs to read track 300 and
the head is on any track (0-255). If a Seek command is issued, the head will stop at track 255. If a
Relative Seek command is issued, the FDC will move the head the specified number of tracks, regardless
of the internal cylinder position register (but will increment the register). If the head was on track 40 (d), the
maximum track that the FDC could position the head on using Relative Seek will be 295 (D), the initial
track + 255 (D). The maximum count that the head can be moved with a single Relative Seek command is
255 (D).
The internal register, PCN, will overflow as the cylinder number crosses track 255 and will contain 39 (D).
The resulting PCN value is thus (RCN + PCN) mod 256. Functionally, the FDC starts counting from 0
again as the track number goes above 255 (D). It is the user鈥檚 responsibility to compensate FDC functions
(precompensation track number) when accessing tracks greater than 255. The FDC does not keep track
SMSC/Non-SMSC Register Sets (Rev.
01-11-07)
Page 71
SMSC LPC47M172
DATASHEET

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