Mc68882 Register Map - Motorola MVME147 Installation And Use Manual

CPU Address Space
The MVME147 responds to two types of CPU space cycles:
The MC68030 is capable of generating other types of CPU space
cycles (using breakpoint acknowledge, access level control, or
MOVES instructions), but the MVME147 has no devices that
respond to them.
Coprocessor Register Map
The MC68882 is the only coprocessor on the MVME147. The map
decoder selects the MC68882 any time the MPU executes a
coprocessor cycle with Cp-ID of %001 (FC2-FC0 =%111 and A19-
A13 =%0010001). The MC68882 registers are selected by A4-A0 as
shown in
A4-A0
(in Binary)
%0000x
%0001x
%0010x
%0011x
%0100x
%0101x
%0110x
%0111x
%100xx
%1010x
%1011x
%110xx
%111xx
Note
Writes to the MC68882 read-only registers are ignored and reads to write-
only registers return all 1s.
Coprocessor
Interrupt acknowledge
Table 3-5.
Table 3-5. MC68882 Register Map
MC68882 Register
Response
Control
Save
Restore
Reserved
Command
Reserved
Condition
Operand
Register select
Reserved
Instruction address
Operand address
Comments Port Size
Read only D16
Write only D16
Read only D16
Read/write D16
D16
Write only D16
D16
Write only D16
Read/write D32
Read only D16
D16
Read/write D32
Read/write D32
Memory Maps
3-7
3