Tandy 2000 Service Manual page 684

CORPORATION
STANDARD
MICROSYSTEMS
Floppy Disk Data Separalor
FEATURES
tr
PERFORMS COMPLETE DATA SEPARATION
FUNCTION FOR FLOPPY DISK
DRIVES
N
SEPARATES FM OR MFM ENCODED
DATA
FROM ANY MAGNETIC MEDIA
N
ELIMINATES SEVERAL SSI AND
MSI DEVICES NORMALLY USED
FOR
DATA SEPARATION
T
NO CRITICAL ADJUSTMENTS REQUIRED
T
COMPATIBLE
WITH
STANDARD
MICROSYSTEMS' FDC
1791
, FDC
1793 AND
OTHER FLOPPY DISK CONTROLLERS
N SMALL 8-PIN DUAL-IN-LINE PACKAGE
[
+S VOLT ONLY POWER SUPPLY
T
TTL COMPATIBLE INPUTS AND OUTPUTS
GENERAL
The Floppy Disk
Data
Separator provides a
low
cost
solution to the problem of converting
a
single
stream of
pulses
from
a
floppy disk drive into
separate Clock and
Data
inputs for a Floppy Disk Controller.
The FDDS consists primarily of
a
clock
divider,
a long-
term timing corrector,
a
short-term timing corrector,
and
reclocking circuitry. Supplied
in an 8-pin
Dual-ln-Line
PIN CONFIGURATION
DSKD
SEPCLK
REFCLK
GND
Vocr
SEPD
CD1
CDO
1g
27
36
45
DESCRIPTION
package
to
save board real
estate,
the FDDS
operates
on
+5
volts only and is
TTL compatible on all
inputs
and outputs.
The FDC
9216 is
available in two versions; the FDC 9216,
which is intended tor
SVt"
disks and the
FDC 92168
for
51h"
and
8"
disks.
FDC
921
6
FDC
92168
wc
FAMTLY
FDDS
-
+5V
-GND
CLOCK
DIVIDER
PULSE
REGENERATION
LOGIC
DATA/CLOCK
SEPARATION
LOGIC
EDGE
DETECTION
LOGIC
R
EFCLK
CDO
CD1
FLOPPY
DISK DATA SEPARATOR BLOCK DIAGRAM
DSKD
375