LPC47M182 datasheet(74/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

SMSC LPC47M182

DATASHEET

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

Head Step Direction Control

RCN Relative Cylinder Number that determines how many tracks to step the head in or out from

the current track number.

DIR

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’s responsibility to compensate FDC functions

(precompensation track number) when accessing tracks greater than 255. The FDC does not keep track

that it is working in an “extended track area” (greater than 255). Any command issued will use the current

PCN value except for the Recalibrate command, which only looks for the TRACK0 signal. Recalibrate will

return an error if the head is farther than 255 due to its limitation of issuing a maximum of 256 step pulses.

The user simply needs to issue a second Recalibrate command. The Seek command and implied seeks

will function correctly within the 44 (D) track (299-255) area of the “extended track area”. It is the user’s

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