Read Sharp ER-A850 (serv.man3) Service Manual online
Fig. 2 M5105 Block Diagram
Fig. 3 M5105 Flexible Disk Controller Block Diagram
Floppy di sk
c ont roller
with
analog dat a
s eparat or
( DP 84 73 )
( DP 84 73 )
Con f igurat ion
regis t er
S eria l
interf ace
E I A
interf ace Interru pt
U AR T
Fl op py
dri v e
interf ace
dri v e
interf ace
Filt ers
I nterru pt
& D MA
D S C
Paral lel port
Hi gh c urrent driv ers
S eria l
interf ace
E I A
interf ace Interrupt
U AR T
Ad d r es s
d e c od e
d e c od e
µ P addr es s ,
dat a,
& c ont rol
Game port
EHDI
Co nf ig. I nput s
I nterru pt
Da t a Han ds h ak e
R D
W R
A 0
A1
A 2
C P U
inter face
D 0 ~ D 7
Addre ss
dec ode r
dec ode r
IOL
A0~A9
AEN '
D M A
a n d
interrupt
enable
logic
D A K
D R Q
IR Q 8
T C
M R
Data rate
reg. &
clock
generation
logic
D R VT YP
PU MP/ PR EN
O SC 1
O SC 2
24 MH z
V D D A
VSSA
V D D B
VSSB
VSSC
V SS F
In
te
rn
a
l c
ont
ro
l bus
In
te
rn
a
l d
a
ta
b
u
s
R ESET
Internal data bus
Drivers
contr ol
r egister
MT R 0
MT R 1
D R 0
D R 1
D S KC H G
RESET
7 6 5 A
Compa tible
micr oe ngine
and timing/
control logic
Disk output
a nd
input logic
HDSEL
S T E P
D I R
R P M/ LC
WRT PRT
T R K 0
INDEX
NEC 765 c ompatible
Controller core
Wr i t e
precomp-
ens ation
A nalo g
dat a
separator
Filters for
all data r ates
F ILT ER
FGND 250
FGND 500
External
filters
filters
S ET C U R
External
current set
resister
current set
resister
WGA T E WDA TA
RD ATA
– 2 –
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