MC68882RC25A Freescale, MC68882RC25A Datasheet - Page 13

• Manufacturer Part Number: MC68882RC25A
• Manufacturer: Freescale

Specifications of MC68882RC25A

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

. .... .. ... .... . ... ,, ... .,, .,..,
.$~,+,)?:.,
four clock cycles
time, the RESET line must have an asserted
with
that is internally
MC-
BR=/Rev.
,.”
cycle.
RESET
trol, status, and instruction
should
sures correct initialization
is applied,
vices, 100 milliseconds
been within
which is greater than two clock cycles. For compatibility
be used as the minimum.
CLOCK (CLK)
clock signals, The clock input should ,Qd~$:&~%fi:stant f re-
quency square wave with no stretchi~~~$~$haping
niques required.
MC68882
DSACK
impedance
initialize the floating-point
not-a-numbers
‘“ ‘$~’
.,t{,!~
~.~
When performing
The MC68882 clock input
This active-low
When performing
~,t:,)...~
‘@:J;~ ‘:’%ad/Write
~\ ‘~3
, , ‘&i,@S-elect
all
,>
?~$?$s~tro
Clock
Sense Device
Power Input
Ground
Address
Size ,%~~>)~
Data Strobe
Data Transfer
Reset
Data Bus
(RESET)
keep the
lines
M68000 Family devices,
following
.. . . .. ,
3
For compatibility
,,,
state) to avoid interference
tolerance
Data bus
are then three-stated
32-Bit
32-Bit
16-Bit
8-Bit
Bus,~>’:$
(NANs)
,,.
All
buffered
The clock should q~t~
‘$:$ **~~#F
RESET
after
SignaK<#a*eJ’o
be
input
{
and Size Acknowledge
the rising edge of AS or DS, and both
a reset of the MC68882 after VCC has
a power-up
for more than the initial
VCC is within
and
should be used as the minimum.
line
:~i:i\y
signal
for development~~,th~
A4
data registers to non-signaling
of the MC68882 when
x
x
x
o
1
t!;:>\
clears the floating-point
address registers.
asserted
with all M68000 Family de-
\
is a ~L-com~#~W&~ignal
Freescale Semiconductor, Inc.
.,:~:,?,’ . .. . .sy. >.,’
<.
causes the MC68882
reset, external
For More Information On This Product,
10
DSACKI
High
High
(placed
Low
Low
Low
clock cycles should
tolerance.
for a minimum
with the next bus
~ated
Go to: www.freescale.com
DSACKO, DSACK1
in the high-
p~lse width
Table
~ower-uo
?nternal
offat
DSACKO
Mnemonic
i~,,!, .?*t.
circuitry
This
SENSE
High
High
High
..,7,.
DO-DI 3
Low
RESET
Low
AO-A4
GND
,$,$
SIZE
Vcc
CLK
power
‘!..!,$:,,,,
Rim
m
G
m
tech-
5. DSACK
con-
anY
,’
as-
to
of
.,<..(*’
‘~;$,::::b%?$:
.*,. ‘*>$*s
Valid Data on D31-D16 or D15-DO
Valid Data on D31-D24,.D23-D16,
Valid Data on D31-DO
Valid Data on D31-D16
Insert Wait States in Current
I;,, -ho
,P,$~fi~ appropriate capacitive
...
..~~uf~
SIGNAL SUMMARY
connected
to connect
operation.
ware may sense, the~resence
tem.
~owER
er%a$e Iekl
connect (NC). This pin position
or connected
described
time and must conform
SENSE DEVICE (SENSE)
pin or as as indicator
MC68882 is present in the sys~$m$%~~ signal is internally
by Motorola,
Assertions
riod and pulse width times.
10 kohm) is conneqq~t~%~s
Table 6 provides
This pin may be used optionally
Thes%i~~ns provide the supply voltage
One pin of the MC68882 package is designated
lnputiOutput
Input/Output
Input/Output
CONNECT (NC)
output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
,.\q,~.,.. .*,:,,. ,~. ,,,
be taken to reduce the noise level on these pins
~gc~j
in the above paragraphs.
Ifa pullup rp~~$~iwhich
to the GND of t~:~~$~, but it is not necessary
it to the ext~w$$?ound
,b~.,$7::+
for the internal circuitry of the MC68882, Care
~t:.,it ,$* ! >:$;$.
and should
to VCC or GND.
.~,~t~.
Comments
~$}.}.
Active State
~ND)
a summary
.a*~J:
High/Low
~ ,x~:,<,:i,.
High
High
Low
Low
Low
Low
Bus Cycle
Low
Low
Low
—
—
—
to minimum
to exte{~’~?$t~~dware
not be used for signal routing
D15-D8, or D7-DO
decoupling,
pin location,
of all the MC68882 signals
of the MC68882 in a sys-
is reserved for future
. .. .. . . . . .. . .
Three State
~~~fi,$~ditional
should be Iargerthan
Yes
~! *!V$ ,$~
Yes
and m~~~~.~’’pe-
No
—
—
for correct
—
—
—
—
—
—
—
—
it,. . > ,k.:.:t.:,
,,:,,?
.,
,*S.$.* ‘y,,
and system ref-
“:$w,. ,.,<,,,
external
~’~ $..;.., ,w~\.:.\l~.
,,.$
*~. ‘ ~ ~~j,?~
MOTOROLA
. . . . ..
.:J;:::{:.Jy<,:~:!l
that
as a no
device
~ ~~~.j,
,..
hard-
GND
use
the
~,
13
. ,,, ..,.