SECTION 11
INTERFACING METHODS
This section contains information about the interface logic required to connect the MC68881/
MC68882 (FPCP) to an MC68020/MC68030 (MPU) as a coprocessor, or to an MC68000,
MC68008, or MC68010 as a peripheral processor.
11.1 FPCP AND MPU INTERFACING
The following paragraphs describe the connecting of the FPCP to an MPU for coprocessor
operation using an 8-, 16-, or 32-bit data bus.
11.1.1 32-Bit Data Bus Coprocessor Connection
Figure 11-1 illustrates the coprocessor interface connection of an FPCP to an MPU using
a
32-bit data bus. The FPCP is configured to operate over a 32-bit data bus when both the
A0 and SIZE pins are connected to VCC.
CHIP
SELECT
:1
, ,coD, ]
-I
FCO-FC2 '
A20-A31
t
AI6-AI9
AI3-A15 1
A5-A12
A1-A4
A0
OS
R/W
024-D31
O16.023 41
D8-D15 91
00-07
DSACKO ,ql
OSACK1
VCC
VCC
II=
IP
Ib
E1
SIZE
A1-A4
AO
AS
R/W
O24-D31
D16-D23
D8-015
00-07
DSACKO
OSACKt
t f
MAIN PROCESSOR COPROCESSOR
CLOCK CLOCK
Figure 11-1.32-Bit Data Bus Coprocessor Connection
MC68881/MC68882 USER'S MANUAL
FREESCALE
11-1
MCSRO20/MC68030 MC68881/MC68882
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