Analog Devices adsp-2100 Manual page 240

MMAP = 0
Program Memory
8K Internal
(PMOVLAY = 0)
or
External 8K
(PMOVLAY = 1 or 2)
8K Internal
Figure 10.25 ADSP-2181 Program Memory Map
The following example instructions demonstrate how to use the
PMOVLAY register.
PMOVLAY=DM(0x1234);
}
DM(0x1234)}
PMOVLAY=2;
PMOVLAY=AX0;
AX0=PMOVLAY;
If you are using a system design that sets MMAP=1, note that the first 8K is
used to support a single segment of external memory. This allows an
external ROM-based system to operate properly. In this mode, the external
program memory address always has A13 set to 0 and 8K of internal PM is
available. Set PMOVLAY=0 and MMAP=1. This mode is available on other
Memory Interface
Address
0x3FFF
0x2000
0x1FFF
0x0000
{type 3 instruction, PMOVLAY is loaded
{ with the contents of address
{type 7 instruction, PMOVLAY is loaded }
{ with the value 2. }
{PMOVLAY is loaded from AX0 register.}
{AX0 is loaded from PMOVLAY register.}
MMAP = 1
Program Memory
8K Internal
(PMOVLAY = 0)
8K External
10
Address
0x3FFF
0x2000
0x1FFF
0x0000
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