FDC37C672 datasheet(41/173 Pages) SMSC

41 / 173 page

Enhanced Super I/O Controller with Fast IR

Datasheet

SMSC FDC37C672

Page 41

Rev. 10-29-03

PRELIMINARY DATASHEET

SYMBOL

NAME

DESCRIPTION

MFM

MFM/FM Mode

Selector

A one selects the double density (MFM) mode. A zero selects single density

(FM) mode.

Multi-Track Selector

When set, this flag selects the multi-track operating mode. In this mode, the

FDC treats a complete cylinder under head 0 and 1 as a single track. The

FDC operates as this expanded track started at the first sector under head 0

and ended at the last sector under head 1. With this flag set, a multitrack

read or write operation will automatically continue to the first sector under

head 1 when the FDC finishes operating on the last sector under head 0.

Sector Size Code

This specifies the number of bytes in a sector. If this parameter is "00", then

the sector size is 128 bytes. The number of bytes transferred is determined

by the DTL parameter. Otherwise the sector size is (2 raised to the "N'th"

power) times 128. All values up to "07" hex are allowable. "07"h would

equal a sector size of 16k. It is the user's responsibility to not select

combinations that are not possible with the drive.

. .

SECTOR SIZE

128 bytes

256 bytes

512 bytes

1024 bytes

. . .

NCN

New Cylinder

Number

The desired cylinder number.

Non-DMA Mode

Flag

When set to 1, indicates that the FDC is to operate in the non-DMA mode.

In this mode, the host is interrupted for each data transfer. When set to 0,

the FDC operates in DMA mode, interfacing to a DMA controller by means

of the DRQ and nDACK signals.

Overwrite

The bits D0-D3 of the Perpendicular Mode Command can only be modified if

OW is set to 1. OW id defined in the Lock command.

PCN

Present Cylinder

Number

The current position of the head at the completion of Sense Interrupt Status

command.

POLL

Polling Disable

When set, the internal polling routine is disabled. When clear, polling is

enabled.

PRETRK

Precompensation

Start Track Number

Programmable from track 00 to FFH.

Sector Address

The sector number to be read or written. In multi-sector transfers, this

parameter specifies the sector number of the first sector to be read or

written.

RCN

Relative Cylinder

Number

Relative cylinder offset from present cylinder as used by the Relative Seek

command.

Number of Sectors

Per Track

The number of sectors per track to be initialized by the Format command.

The number of sectors per track to be verified during a Verify command

when EC is set.

Skip Flag

When set to 1, sectors containing a deleted data address mark will

automatically be skipped during the execution of Read Data. If Read Deleted

is executed, only sectors with a deleted address mark will be accessed.

When set to "0", the sector is read or written the same as the read and write

commands.

SRT

Step Rate Interval

The time interval between step pulses issued by the FDC. Programmable

from 0.5 to 8 milliseconds in increments of 0.5 ms at the 1 Mbit data rate.

Refer to the SPECIFY command for actual delays.

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