Intel387
TM
SX MATH COPROCESSOR
1.0 PIN ASSIGNMENT
The Intel387 SX Math CoProcessor pinout as
viewed from the top side of the component is shown
in Figure 1-1. V
CC
and V
SS
(GND) connections must
be made to multiple pins. The circuit board should
include V
CC
and V
SS
planes for power distribution
and all V
CC
and V
SS
pins must be connected to the
appropriate plane.
NOTE:
Pins identified as N.C. should remain completely
unconnected.
240225–1
Figure 1-1. Intel387
TM
SX Math CoProcessor Pinout
Table 1-1. Pin Cross ReferenceÐFunctional Grouping
BUSY
Ý
36 D00 19 V
CC
4V
SS
5 N.C. 1
PEREQ 56 D01 20 9 14 10
ERROR
Ý
35 D02 23 13 21 17
D03 8 22 25 18
ADS
Ý
47
D04 7 26 27 52
CMD0
Ý
48
D05 6 31 32 65
NPS1
Ý
44
D06 3 33 34 67
NPS2 45
D07 2 37 38 68
STEN 40
D08 24 39 42
W/R
Ý
41
D09 28 43 55
READY
Ý
49
D10 29 46 60
READYO
Ý
57
D11 30 50 61
D12 16 58 63
D13 15 62 66
CKM 59
D14 12 64
CPUCLK2 54
D15 11
NUMCLK2 53
RESETIN 51
5
5
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