ECM-5510

2.4.25.1 Signal Description – Floppy Connector (FLP1)

 

Signal

 

Signal Description

 

RDATA

 

 

The read data input signal from the FDD.

 

WDATA

 

Write data. This logic low open drain writes pre-compensation serial data to the

 

 

selected FDD. An open drain output.

 

 

 

 

 

 

 

 

 

WGATE

 

Write enable. An open drain output.

 

MOATSA

 

Motor A On. When set to 0, this pin enables disk drive 0. This is an open drain

 

 

output.

 

 

 

 

 

 

 

 

 

 

MOTEB

 

 

Motor B On. When set to 0, this pin enables disk drive 1. This is an open drain

 

 

 

output.

 

 

 

 

 

DRVSA

 

Drive Select A. When set to 0, this pin enables disk drive A. This is an open drain

 

 

output.

 

 

 

 

 

 

 

 

 

 

DRVSB

 

 

Drive Select B. When set to 0, this pin enables disk drive B. This is an open drain

 

 

 

output.

 

 

 

 

 

SIDE1

 

This output signal selects side of the disk in the selected drive.

 

 

 

 

 

 

 

 

 

Direction of the head step motor. An open drain output

 

DIR

 

 

Logic 1 = outward motion

 

 

 

 

Logic 0 = inward motion

 

STEP

 

Step output pulses. This active low open drain output produces a pulse to move

 

 

the head to another track.

 

 

 

 

 

 

 

 

 

 

REDWC

 

 

This output indicates whether a low drive density (250/300kbps at low level) or a

 

 

 

high drive density (500/1000kbps at high level) has been selected.

 

 

 

 

 

TK00

 

Track 0. This Schmitt-triggered input from the disk drive is active low when the

 

 

head is positioned over the outermost track.

 

 

 

 

 

 

 

 

 

 

INDEX

 

 

This Schmitt-triggered input from the disk drive is active low when the head is

 

 

 

positioned over the beginning of a track marked by an index hole.

 

 

 

 

 

WPT

 

Write protected. This active low Schmitt input from the disk drive indicates that the

 

 

diskette is write-protected.

 

 

 

 

 

 

 

 

 

 

DSKCHG

 

 

Diskette change. This signal is active low at power on and whenever the diskette is

 

 

 

removed.

 

 

 

 

 

 

 

 

 

56 ECM-5510 User’s Manual