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8272 Schematic ( PDF Datasheet ) - Intel Corporation

Teilenummer 8272
Beschreibung Single / Double Density Floppy Disk Controller
Hersteller Intel Corporation
Logo Intel Corporation Logo 




Gesamt 27 Seiten
8272 Datasheet, Funktion
Visit Intel's WWW site for more information on recent products and services.
8272
SINGLE/DOUBLE DENSITY
FLOPPY DISK CONTROLLER
&amstrad;
IBM Compatible in Both Single and Double Density Recording Formats
Programmable Data Record Lengths: 128,256,512, or 1024 Bytes/Sector
www.DataSheetM4Uu.clotmi-Sector and Multi-Track Transfer Capability
Drive up to 4 Floppy Disks
Data Scan Capability - Will Scan a Single Sector or an Entire Cylinder's Worth of Data
Fields, Comparing on a Byte by Byte Basis, Data in the Processor's Memory with Data
Read from the Diskette
Data Transfers in DMA or Non-DMA Mode
Parallel Seek Operations on Up to Four Drives
Compatible with Most Microprocessors including 8080A,8085A,8086 and 8088
Single-Phase 8 Mhz Clock
Single +5 Volt Power Supply
Available in 40-Pin Plastic Dual-in-Line Package
The 8272 is a LSI Floppy Disk Controller (FDC) Chip, which contains the curcuitry 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






8272 Datasheet, Funktion
37 FR/STP O
36 HDL
O
35 RDY
I
34
www.DataSheet4U.com
WP/TS
I
33 FLT/TRK0 I
31,32 PS1,PS0 O
30 WR DATA O
28,29 DS1,DS0 O
27 HDSEL O
26 MFM
25 WE
24 VCO
O
O
O
23 RD DATA I
22 DW
I
21 WR CLK I
FDD
FDD
FDD
FDD
FDD
FDD
FDD
FDD
FDD
PLL
FDD
PLL
FDD
PLL
step pulses to move head to
another cylinder in seek
mode.
Head Load: Command
which causes read/write
head in FDD to contact
diskette.
Ready: Indicates FDD is
ready to send or receive
data.
Write Protect/Two Side:
Senses Write Protect status
in Read/Write mode and
Two side media in Seek
mode.
Fault/Track 0: Senses FDD
fault condition in Read/Write
mode and Track 0 condition
in Seek mode.
Precompensation (pre-
shift): Write
precompensation status
during MFM mode.
Determines early, late and
normal times.
Write data: Seial clock and
data bits to FDD.
Drive Select: Selects FDD
unit
Head Select: Head 1
selected when "1" (high).
Head 0 selected when
"0" (low).
MFM Mode: MFM mode
when "1", FM mode when
"0"
Write Enable: Enables write
data into FDD
VCO Sync: Inhibits VCO in
PLL when "0" (low), enables
VCO when "1".
Read Data: Read data from
FDD containing clock and
data bits
Data window. Generated by
PLL, and used to sample
data from FDD
Write Clock: Write data rate
to FDD FM = 500Khz, MFM
= 1 Mhz, with a pulse width
of 250ns for both FM and

6 Page









8272 pdf, datenblatt
W
W
Execution
R
R
R
Result R
R
R
R
www.DataSheet4U.com
GPL
D
ST0
ST1
ST2
C
H
R
N
Gap 3
Filler Byte
FDC formats an entire
cylinder
Status information after
command execution
In this case the ID
information has no
meaning
Phase R/W
W
W
W
W
Command W
W
W
W
W
Execution
Result
R
R
R
R
R
R
R
D7 D6
MT MFM
00
SCAN LOW
Data Bus
D5 D4 D3 D2 D1
SK 1 0 0
0
0 0 0 HDS DS1
C
H
R
N
EOT
GPL
STP
D0
1
DS0
ST0
ST1
ST2
C
H
R
N
Remarks
Command Codes
Sector ID Information prior
to command execution
Data compared between
the FDD and main system
Status information after
command execution
Sector ID information after
command execution
Phase
R/W
W
W
W
W
D7 D6
MT MFM
00
SCAN LOW OR EQUAL
Data Bus
D5 D4 D3 D2 D1
SK 1 1 0
0
0 0 0 HDS DS1
C
H
D0
1
DS0
Remarks
Command Codes
Sector ID Information prior

12 Page





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