Chapter 7 Description Of Lsi - Sharp PC-7200 Service Manual

CHAPTER 7. DESCRIPTION OF LSI
- Expands iAPX 286/1,QO,atjlly:PE1s_to ____
I
IncludE1 32-, 64-, 80-~it FIC?at,ng :P,oil1t~
i
32-, 64-Bit IntE1gE1rs jandtS-Qigit SCD
i
OpE1rands I ( ) 'I,
i
i
':T '-___
',}J,
I i
- ObjE1ct COdE1 CompatlI:iLf! ..
with
8087 __
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,_-'
.~ .~~-TT~lA}·J~)
JJ:~:,;,'3lJ1Ali\
- BUilt-in Exception Handling - Available in EXPRESS-Standard
_ Operates inB'oth R'eal"a'ild'Protected',
, i '
';')1
r,I"mper,atL.lr~:f!!!!1ge
Mode iAPX 286 Systems Available In 40 pin-Cerdlp package (see
- 8x80-Bit, Individually Addressable,
Packaging Spec:JOr.dimjj:231369)Dwjj
OrJ,,',
Numeric Register Stack
L
J;'
-':-"1-
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The Intel'"' 80287 is a high performance numerics processor extension that extends t~e ,iAPX 28§l1p:;TI :",:''''''
architecture with floating point, extended integer and BCD
data'fYP'~s:'tHe)i}\PX"i8612d8o'IRpil'ti'ligIJ~ys~rr(~.,
.' , ' " ' " ,(
!lQ?~~) wiith)I,\Q~,!illnt~,1 [)f 9,9,Of9.mJSot9,tp,~;;P,r9Pq~El(M~E;,E;Jflpiltimg)fil9,iJ1t,~f,~!!19,,!r;\j'" ;!J,~ir)g
1!,
I]!,lmer,i~' OJte,~'(~~,'
architecture, the 80287 adds over fifty mnemonics to the iAPX 286/20 instruction set.
ma~ing
.lh,eJAi?Xli286/20
a complete solution for high performance numeric processing'.' line 80287.Cj$llmplementeail1li N;,channel,.1i]
Fl'
depletion load, si I icorf"gilie'fecHnol'ogy' '(HMOS)ai'icfpa'cKa-ged' iWa'
40lpihcerilip'
pab'kage~'
The iiAPX'286/20'
.
""'~blJjei6Pcod'ErC'6'liiipatiiJre'wltflitAe'IAPX'86J20
and
IA'PX"881~O:
'1;''<''lh
<"it'll)
"'i'
I ,,;-, ) ,",VI' ,,;OJ",;'! ",111lle'lJ
p"
'SCi8d
-vt
,j
''11"1
BUS INTERFACE UNIT NUMERIC EXECUTION UNIT
MTA ..... _~
STATUS
ADDRESS
OPERANDS
QUEUE
EKPONNENT
'"
MICAOCODE
CONTROL
UNIT
,
A
G
W
0
,
0
Figure 1. 80287 block diagram
FRACTION
'" 14---'1
INTERFACE
J'J
]0)
I"
_ _ _ 0 -
REGISTER STACK
10]
1'1
1'1
I'l
101
lIGalTS
NOTE:
.15
.13
012
Vce
Vss
011
01.
N.C.
O.
O.
07
De
D.
O.
03
CKM
if
N/C d:
Nle
l.i .
PEACK
RESET
NPS2
ClK
eM01
VSS
CMOO
NPW"
NPRD
ERROR
BUSY
PER~L.C
DO
D1
D2
N,C, PINS MUST NOT BE CONNECTED.
Figure 2. 80287 pin configuration