Intel 386 - Manual (Page 152)

6-39
BUS INTERFACE UNIT
6.6.1.1 System Configuration
The Intel387 SX Math Coprocessor can be interfaced to the Intel386 EX embedded processor as
shown in Figure 6-15.
Figure 6-15. Intel386 EX Processor to Intel387 SX Math Coprocessor Interface
A dedicated communication protocol makes possible high-speed transfer of opcodes and oper-
ands between the Intel386 EX processor and the Intel387 SX math coprocessor. Most control pins
of the Intel387 SX Math Coprocessor are connected directly to Intel386 EX processor pins.
BUSY#
PEREQ
ERROR#
READY# BUSY#
PEREQ
ERROR#
READY#
Clock
Generator
CPUCLK2 CLK2
A2852-02
Synchronous
Reset
LBA#
D15:0
W/R#
ADS#
NPS1#
NPS2
CMD0# W/R#
ADS#
M/IO#
A23
A2
READYO#
NUMCLK2
V
CC
STEN
CKM
D15:0
16
80386EX 80387SX
RESETIN RESET
Intel386™ EX
Embedded Processor
Intel387™ SX
Math Coprocessor