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 

COMMAND SET/DESCRIPTIONS

Commands can be written whenever the FDC is

in the command phase. Each command has a

unique set of needed parameters and status

results. The FDC checks to see that the first

byte is a valid command and, if valid, proceeds

with the command. If it is invalid, an

interrupt is issued. The user sends a Sense

Interrupt Status command which returns an

invalid command error. Refer to Table 17 for

explanations of the various symbols used. Table

18 lists the required parameters and the results

associated with each command that the FDC is

capable of performing.

SYMBOL

C

D

D0, D1

DIR

DS0, DS1

DTL

EC

EFIFO

EIS

EOT

GAP

GPL

H/HDS

Table 17 - Description of Command Symbols

NAME

DESCRIPTION

Cylinder

Address

The currently selected address; 0 to 255.

Data Pattern The pattern to be written in each sector data field during formatting.

Drive Select 0- Designates which drives are perpendicular drives on the

1

Perpendicular Mode Command. A "1" indicates a perpendicular

drive.

Direction

Control

If this bit is 0, then the head will step out from the spindle during a

relative seek. If set to a 1, the head will step in toward the spindle.

Disk Drive

Select

DS1 DS0

0

0

Drive 0

0

1

Drive 1 (not implemented)

Special Sector

Size

By setting N to zero (00), DTL may be used to control the number of

bytes transferred in disk read/write commands. The sector size (N

= 0) is set to 128. If the actual sector (on the diskette) is larger than

DTL, the remainder of the actual sector is read but is not passed to

the host during read commands; during write commands, the

remainder of the actual sector is written with all zero bytes. The

CRC check code is calculated with the actual sector. When N is not

zero, DTL has no meaning and should be set to FF HEX.

Enable Count When this bit is "1" the "DTL" parameter of the Verify command

becomes SC (number of sectors per track).

Enable FIFO This active low bit when a 0, enables the FIFO. A "1" disables the

FIFO (default).

Enable

Implied Seek

When set, a seek operation will be performed before executing any

read or write command that requires the C parameter in the

command phase. A "0" disables the implied seek.

End of Track The final sector number of the current track.

Alters Gap 2 length when using Perpendicular Mode.

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.

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