FDC37B80X 查看數據表（PDF） - SMSC -> Microchip

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FDC37B80X

PC98/99 compliant enhanced super I/O controller with Keyboard / Mouse Wake-Up / 5 Volt Operation

SMSC -> Microchip 

SYMBOL

HLT

HUT

LOCK

MFM

MT

N

NCN

ND

OW

Table 17 - Description of Command Symbols

NAME

DESCRIPTION

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 tha DSR or DOR)

MFM/FM

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

Mode Selector 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

Sector Size

00

128 Bytes

01

256 Bytes

02

512 Bytes

03

1024 Bytes

…

07

16,384 Bytes

New Cylinder The desired cylinder number.

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.

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