MC68882CRC25A Freescale, MC68882CRC25A Datasheet - Page 15

• Manufacturer Part Number: MC68882CRC25A
• Manufacturer: Freescale

Specifications of MC68882CRC25A

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

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.,
,“’
M C688B2
BRW/Rev.
8-bit data bus (i.e., connect
to D9, D17, and D25; . . . and D7 to D15, D23 and D31).
The DSACK pins of the two
sor for opertion
an MC68000
a 16-bit data bus. The MC68882 is configured
over a 16-bit data bus when the SIZE pin is connected
Vcc,
least-significant
the sixteen most-significant
MC68882 is configured
(i.e., connect
The DSACKI
DTACK pin of the main processor,
is not used.
D31)
netted, although
pin since the MC68882
ration.
MC68882-MC68000/MC68008/MC68010
MC68882 to an MC68000, MC68008, or MC6801 O proces-
bus.
16-Bit Data
MAIN PROCESSOR
The following
Figure 14 illustrates
,. ...:
when the MC68882 is configured
and the AO pin is connected
CLOCK
1
Figure 14. 16-Bit Data Bus Peripheral
3
BUS
or
“:. ,, .,..:,, , .’,,,,,,.
DO to D16, DI to D17, ,.. and D15 to D31).
pin of the MC68882
1
MC68010 as a peripheral
data pins (DO-DI 5) must be connected
paragraphs
Peripheral Processor Connection
it is not necessary to connect the DSACKI
as a peripheral
Processor Connection
the connection
to operate over a 16-bit data bus
never asserts it in this configu-
data pins (D16-D31 ) when the
describe how to connect the
DO to D8, D16 and D24; DI
Freescale Semiconductor, Inc.
devices
!,
For More Information On This Product,
via an 8- or 16-bit data
,.
to GND. The sixteen
and the DSACKO pin
is connected
to operate over an
of an MC68882 to
r
are directly
INTERFACING
--- .,,. .
COPROCESSOR
processor
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CLOCK
to operate
I
,.’,
to the
over
con-
,,,
to
to
.
chip
the MOVES instruction
space access that the MC68020/MC68030
coprocessor
for such systems
8-Bit Data Bus Peripheral Processor C,~~~f~8n
an MC68008 as a peripheral
data bus when the SIZE piq,,is’”&&#nected
eight
netted to the twenty:f~~~~~st-sig
when the MC68882a{,~.~~b@ figured
bit data bus (i,e,, q~@M’DO
D9, D17, and ~$;
DSACKO
pin of th@<W~m08,
chip #&#ct (CS) decode is system dependent,
~#st
MC68000 is used as the main processor,
must be decoded
However,
MC68030 system, such that the MC68882 will not-’hse any
part of the data address spaces.
bus, The MC68882 is configur~
- ,“,
M’AIN PRbCESSOR
When connected as a peripheral
Wh~@ ~-cted
Figure
g
~
m
:
select
be:tiecoded
CLOCK
least-significant
f
A16-A19
A13-A15
pin$$,~~~ MC68882 is connected
FCO-FC2 --+
15
A5-A12 -–*
DTACK ~
Figure 15. 8-Bit Data Bus Peripheral
if the MC68010 is used for the main processor,
00-07
Al -A4
R~
illustrates
(CS) decode,
communications.
m
B
AO ~
~
.
4
--+
--*
Processor Connection
.,,
in the supervisor
in the supervisor
may be the same as in an MC68020/
.’!:,* and D7 to D15, D23, and D31), The
as a peripheral
and the DSACKI
the connecti,~hjd~j~k
d~ti$~~s
DEPENDENT)
may be used to emulate
(SYSTEM
DECDDE
SELECT
CHIP
is system
proc~$@’’r,@ver an 8-bit data
to D8, D16, and D24; DI to
Thus, the CS decode logic
GND+
<.~1.g,
tm~perate
processor, the MC68882
processor, the MC68882
(DO-D7) must
-
to operate
—
, !!*,*),
nificant
.
or user data spaces.
or user data spaces,
+
*
.
*
*
>
+
..
dependent.
- R~
pin is not used.
. . . . .
D16-D23
D8-D15
DSACKO
Al -A4
AO
E
E
D24-D31
DO-D7
DSACK1
E
SIZE
the MC68882 CS
COPROCESSOR
... . .. .. .... .. .., .,,. . .. .. .... ...
,* ~$$,
to the DTACK
generates
pins (D8-D31 )
,,i#:*~”
~.i
to GND. The
CLOCK
,,
over an 8-bit
MC68882 to
MOTOROLA
,,.:; {$:, ~, ‘ ,”.:
and the CS
t
over an 8-
., ; *s.t::\~&
~~
k};< ..N*..
any CPU
be con-
,,
If the
g
g
8
z
for
15