FDC37C669 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37C669

PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

SYMBOL

GPL

H/HDS

HLT

HUT

LOCK

MFM

MT

N

Table 18 - Description of Command Symbols

NAME

DESCRIPTION

Gap Length

The Gap 3 size. (Gap 3 is the space between sectors excluding the

VCO synchronization field).

Head Address

Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID

field.

Head Load Time

The time interval that FDC waits after loading the head and before

initializing a read or write operation. Refer to the Specify command

for actual delays.

Head Unload Time The time interval from the end of the execution phase (of a read or

write command) until the head is unloaded. Refer to the Specify

command for actual delays.

Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters of

the CONFIGURE COMMAND can be reset to their default values by

a "Software Reset". (A reset caused by writing to the appropriate bits

of either the DSR or DOR)

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.

N

00

01

02

03

..

07

SECTOR SIZE

128 bytes

256 bytes

512 bytes

1024 bytes

…

16 kbytes

42

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