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

PCN

POLL

PRETRK

R

RCN

SC

SK

SRT

ST0

ST1

ST2

ST3

WGATE

Table 17 - Description of Command Symbols

NAME

DESCRIPTION

Present

Cylinder

Number

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

Status command.

Polling

Disable

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

polling is enabled.

Precompensat Programmable from track 00 to FFH.

ion Start Track

Number

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.

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.

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.

Status 0

Status 1

Status 2

Registers within the FDC which store status information after a

command has been executed. This status information is available

to the host during the result phase after command execution.

Status 3

Write Gate

Alters timing of WE to allow for pre-erase loads in perpendicular

drives.

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