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8272
SINGLE/DOUBLE
DENSITY
FLOPPY
DISK
CONTROLLER
•
IBM Compatible
in
Both Single and
•
Data Transfers in DMA or Non·DMA
Double Density Recording Formats Mode
•
Programmable Data Record Lengths:
•
Parallel Seek Operations
on
Up to
128,256,512,
or 1024 Bytes/Sector
Four Drives
•
Multi·Sector and Multi·Track Transfer
Compatible with Most
Capability
•
Microprocessors Including 8080A,
•
Drive Up to 4 Floppy Disks
8085A,
8086 and 8088
•
Data Scan Capability - Will Scan a
•
Slngle·Phase 8
MHz
Clock
Single
Sector or
an
Entire Cylinder's
Worth of Data Fields, Comparing
on
a
•
Single
+5
Volt Power Supply
Byte
by
Byte Basis, Data in the
Processor's Memory with Data Read
•
Available in 40·Pln Plastic Dual·ln·Llne
from the Diskette Package
The
8272
is
an
LSI
Floppy Disk Controller
(FDG)
Chip, which contains the circuitry and control functions for Interfacing
a processor to
4.
Floppy Disk Drives. It is capable of supporting either IBM
3740
single density format
(FM),
or
IBM
System
34
Double Density format (MFM) including double sided recording. The
8272
provides control signals which
simplify the design
of
an
external phase locked loop,
and
write precompensation circuitry. The
FDC
simplifies and
handles most
of
the burdens associated with implementing a Floppy Disk Drive Interface.
PIN CONFIGURATION
RESET
Vee
liD
RWISEEK
AO
WPITS
0
8
0.7
DATA
BUS
BUFFER
TERMINAL
COUNT
-.
DRQ
mK_
INT
liD_
WR
~
CONTROL
Ao
~
LOGIC
RESET
~
L-.,..-....I
elK
~
Vee
-...
GND
---+-
8272 INTERNAL BLOCK DIAGRAM
REGISTERS
SERIAL
INTERFACE
CONTROLLER
.....-.-READY
DRIVE
INTERFACE
CONTROLLER
WRITE PROTECTITWO SIDE
INDEX
FAULTITRACK
0
DRIVE
SELECT
0
DRIVE
SELECT
1
MFM
MODE
l'iW/SEEK
HEAD
LOAD
HEAD
SELECT
LOW
CURRENT/DIRECTION
FAULT
RESET/STEP
Intel
Corporation
Assumes
No
Responsibllty
for
the
Use
of
Any
Circuitry
Other
Than
Circuitry
Embodied
in
8n
Intel
Product.
No
Other
Circuit
Patent Licenses are
Implied.
© INTEL CORPORATION. 1980 9-51