FDC37C932APM 查看數據表（PDF） - SMSC -> Microchip

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FDC37C932APM

Plug and Play Compatible Ultra I/O™ Controller with Soft Power Management

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 19 for

explanations of the various symbols used. Table

20 lists the required parameters and the results

associated with each command that the FDC is

capable of performing.

Table 19 - Description of Command Symbols

SYMBOL

NAME

DESCRIPTION

C

Cylinder Address The currently selected address; 0 to 255.

D

Data Pattern

The pattern to be written in each sector data field during

formatting.

D0, D1, D2, Drive Select 0-3

D3

Designates which drives are perpendicular drives on the

Perpendicular Mode Command. A "1" indicates a perpendicular

drive.

DIR

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.

DS0, DS1 Disk Drive Select

DS1

0

0

1

1

DS0

DRIVE

0

drive 0

1

drive 1

0

drive 2

1

drive 3

DTL

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

Size

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.

EC

Enable Count

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

becomes SC (number of sectors per track).

EFIFO

Enable FIFO

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

FIFO (default).

EIS

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

Seek

read or write command that requires the C parameter in the

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

40

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