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 asshown 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 pinsof 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 Processo r Intel387™ SX
Math Coprocessor