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PDF FD1771 Data sheet ( Hoja de datos )
| Número de pieza | FD1771 | |
| Descripción | FLOPPY DISK FORMATTER/CONTROLlER | |
| Fabricantes | Western Digital | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FD1771 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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WESTERN DIGITAl
MOS/LSI
FD1771
APPLICATION NOTE
FLOPPY DISK CONTROLLER
APPLICATION NOTE
Introduction
The FD 1771 is a MOS/LSI device that performs the
function of interfacing a processor to a' flexible (Floppy)
diskette drive. This single chip replaces nearly 80% of the re-
quired disk drive interface electronics. (See figure 1-1) .It pro-
vides tha data accessing controls and the bidirectional transfer
of information between the processor's memory and the mag-
netically stored data on the diskette. The diskette data is stored
in a data entry format compatible with the IBM 3740 specifi-
cation (other formats may be used providing more data stor-
age). In this format all information is recorded on tracks
(radial paths) in sectors (arc sections) defined by a program.:
rned heade'r asshown below:
FLOPPY DISK FORMATTER/CONTROLlER
Index Address Mark Data 1 1 1.1 1 1 0 0
oClock 1 1 0 1 1 1 1
ID Address Mark
Data 1 1 1 1 1 1 '1 0
Clock 1 1 00 0 1 1 1
Data Address Mark Data 1 1 1 1 1 0 1 1
Clock 1 1 0 00 1 1 1
Deleted
Data 1 1 1 1 1 00 0
Data Address Mark oClock 1 1 0 0 1 1 1
=FC
=07
=FE
=C7
=FB
==C7
=F8
=C7
These patterns are used as synchronization codes by the
FD 1771 when reading data and are recorded by the formatting
command, Write Track, when the FD 1771. is presented with
data F7 through FE.
Bytt'
1
6 "7
1-128
,ITrack
Byte> Sector ~ector
Cyclic
gap 2 Datd Data Data .gap 3
Nurntwr of Number U'flytn Hedundancy (17 Adcll"';S'
CRe . (33 Bytes
lero's
(flO of Check ·(CRC) Bytes)
[BYtes)
Mark
10 FIELD
DATA FIELD
SECTION I FD1771 DESCRIPTION
1.1 FD1771 - Flexible Drive Interface (Refer to Figure 1-1
FD1771 Block Diagram)
The FD1771 hand les si ngle density frequency modulated
The F01771 generates all controls to position the read/
(FM) data. Each data cell is defined by clock pulses. A pulse
write head over the desired track. The FD1771 has the capabi-
recorded between clock pulses identifies the presence of a
lity of sending successive three phase pulses over the lines PH 1,
logic 1 bit; the absence of this pulse is interpreted as a logic 0
bit. The Address Marks for Index,1 D, and Data are identified
PH2, and PH3 for 3 phase stepping motors or by sending a
level over the PH2 line and pulses over the PH 1 lines to deter-
by a particular pattern not repeated in the remainder of the
mine direction and stepping rate tor step-direction motors.
ID field or Data field. This is accomplished by reading patterns
The particular motor interface is chosen by hardwiring the ex-
that are recorded with missing clock bits (logic 0) as shown
ternal pin, 3PM.
below:
ALL REFERENCE TO FD1171 DENOTESFD1771-01 VERSION
IC
I0
M
P
U
T
E
R
I
N
T
E
R
F
A
C
E
,. nnA. (8)
AO
A1
B
RE
~
Q'R
+5V
o{10K rL 10K
(>
?ORO
INTRO·-
ClK (2 MHz)
FLOPPY DISK
CONTROllERI
FORMATTER
F01n1
FOOATA
~CLOCK
..., +5V
-JrTm
--~
WD
WG
WI'RT
WI!
TP
TftCm
READY
TG43
PHlISTEP
PH2/0lRC
PH3
R "~-~
i5i'NT
--~
~HLD_~I O(NIFEUSsH~DO)Tj
11 I ,VSSVRSVOD VCC
-5 +12 +5
FD1771 SYSTEM BLOCK DIAGRAM
FIG1
F
l
0
P
P
y
0
I
S
K
0
R
I
V
E
> >~
.: 0
r·~i e: ~ ~ ti>cc·a~~:
«
«>-c ~ ~
I~ « ~aw:
c
~
C)
~
~
c
..J
:I:
c
C
LL
..J
(,)
C
LL
~~
..J ..J
U :I:
U')
+
u
>U
D
• ...- C"ot ...,
'" '" ,... co ~ 2 : ~ ~ :! ~ ~ : ~ ~ ~
~ ~. ~ i i I~>~ I~ ~ I~ <0 .(~~
~
I~ ~I
wQ.
~ ce~n
aU:
C
M
:I:
Q.
:;c
I:E
>eenn
Z
~
A Suffix - Ceramic
=B Suffix Plastic
FD1771 :lIN CONNECTIONS
FIG 2
WEBTERN¢DIGITAI.
C O R P O R A , I 0 IV
3128 RED HILL AVENUE, BOX 2180
NEWPORT BEACH, CALfFORNIA'92663
(714)557-3550
TWX 91C-595-1139
1 page  
WESTERN DIGITAL
1.5 Processor Programming
Some examples of-the software control of the Floppy Disk Formatter are shown in the following flow chart. The first ex-
ample (Figure 1-2) shows the writing of information onto a particular track and sector. The second example (Figure 1-3) shows
accessing of information from successive sectors. The third example shows how information may besought by using Track .00 as
a table of contents (Figure 1-4)
TRACK - A3
ADDR-01 16
WE-0
SECTOR - 16
ADDR - 10
WE-0
HEAD LOAD ACTIVATED
VERIFY REQUESTS
6MS STEP RATE
ADDR 40
-wE-0
ASSUMES
HEAD IS ENGAGED
TRACK IS LOCATED
DESIRED SECTOR IS LOCAlED
ENGAGE HEAD LOAD AND MULTIPLE SECTORS
fNAB'SI8MFORMAT (128 BYTES/SECTOR)
ADDR - 00. WE- 0
ADDR -00
-R"f-0
ADDR -11. -iiE--0
REPEAT SEEK
OPERATION OR
DO DIAGNOSTIC
TEST
HEAD IS ASSUMED LOADED FROM
SEEK OPERATION WRITE SINGLE
SECTOR. IBM SECTOR FORMAT
/128 BYTES, DATA ADDRESS
MARK - FB. ADDR - 00. WE - 0
YES
NOTE: NO, OF BYTES TRANSFERRED
SHOULD ENCOMPASS TOTAL
SECTORS TO ALLOW VALID CRC
CHECKS AT THE END OF EACH
SECTOR,
ADDR -00
-R"E-0
PERFORM ERROR
DIAGNOSTICS
ADDR -11
-wt-0
DRQ
REREAD OR PERFORM
ERROR DIAGNOSTICS
AODR .,.00
WE-0
FIGURE 1-3
PERFORM ERROR
DIAGNOSTICS
OPERATION
COMPLETE
FIGURE 1-2
WEBTERNW DIGITAl.
COR P 0 R A
o !II
5
3128 RED HILL AVENUE, BOX 2180
NEWPORT BEACH, CAL.I'FORNIA.92663
(714) 557·3550
TWX 910·595·1139
5 Page 
WESlERN·DIGITAL
FD1771
DBIN
DBOUT
INTRQ
FlED MODE
DBIN
ODR
FIFO MODE
DBOUT·
IRE
ADDR
DATA
LINES
READY
DATA
LINES
DATA
LINES
FIFO S-EL
DB'IN + DBOUT
FIFO.MODE
.FIFOMODE
FDM'ODE
Q FIFO MODE
FD SEL -
.........-
..... D Q
1/2
7474
C
FDMODE
Q FDMODE
DBOUT
FD MODE
DUMP
ODRDS
DBIN
FD MODE
FCLK
LOAD FIFO
CLEAR FIFO
REF
REF
TRANMOQE
___- - WE
_____-R"E
WE' TEIIN~ DIS/Till.
e' 0 .R P 0 R A r I o IV
FIGURE 2-7
TIMING CONTROL
11
3128 RED HIL~ AVENU.E,. BOX 2180
NEWPOHTBEACH,'CALIFORNIA92663
(714) 557-3550
twx 910-595-1139
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet FD1771.PDF ] | |
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