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FDC37C78

Floppy Disk Controller

SMSC -> Microchip 

SYMBOL

PCN

POLL

PRETRK

R

RCN

SC

SK

SRT

ST0

ST1

ST2

ST3

WGATE

Table 18 - Description of Command Symbols

NAME

DESCRIPTION

modified if OW is set to 1. OW id defined in the Lock command.

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

Number

Status command.

Polling Disable

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

is enabled.

Precompensation Programmable from track 00 to FFH.

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 Relative cylinder offset from present cylinder as used by the Relative

Number

Seek command.

Number of Sectors The number of sectors per track to be initialized by the Format

Per Track

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.

31

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