ADSP-2189M
PM (MODE B = 0)
ALWAYS
ACCESSIBLE
AT ADDRESS
0 0000 – 0 1FFF
0 2000–
0 3FFF
0 2000–
0 3FFF
PM (MODE B = 1)
1
RESERVED
0 2000–
0 3FFF
ACCESSIBLE WHEN
PMOVLAY = 0
INTERNAL
MEMORY
RESERVED
RESERVED
ACCESSIBLE WHEN
PMOVLAY = 1
EXTERNAL
MEMORY
RESERVED
0 0000–
0 1FFF
2
0 0000–
0 1FFF
2
ACCESSIBLE WHEN
PMOVLAY = 0
0 2000–
INTERNAL ACCESSIBLE WHEN
0 3FFF
PMOVLAY = 4
MEMORY
0 2000–
ACCESSIBLE WHEN
0 3FFF
2
PMOVLAY = 5
0 2000–
ACCESSIBLE WHEN
0 3FFF
2
PMOVLAY = 1
EXTERNAL
ACCESSIBLE WHEN
MEMORY
PMOVLAY = 2
1
WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0
2
SEE TABLE III FOR PMOVLAY
BITS
PROGRAM MEMORY
MODE B = 0
ADDRESS
0 3FFF
8K INTERNAL
PMOVLAY = 0, 4, 5
OR
8K EXTERNAL
PMOVLAY = 1, 2
0 2000
0 1FFF
8K INTERNAL
0 0000
PROGRAM MEMORY
MODE B = 1
ADDRESS
0 3FFF
8K INTERNAL
PMOVLAY = 0
0 2000
0 1FFF
8K EXTERNAL
0 0000
Figure 4. Program Memory
Mode D = 1 and in host mode:
IACK
is an open source and
requires an external pull-down, but multiple
IACK
pins can be
wire OR-ed together.
MEMORY ARCHITECTURE
Data Memory
The ADSP-2189M provides a variety of memory and peripheral
interface options. The key functional groups are Program Memory,
Data Memory, Byte Memory and I/O. Refer to the following
figures and tables for PM and DM memory allocations in the
ADSP-2189M.
Program Memory
Data Memory,
Full Memory Mode
is a 16-bit-wide space
used for the storage of data variables and for memory-mapped
control registers. The ADSP-2189M has 48K words on Data
Memory RAM on-chip. Part of this space is used by 32 memory-
mapped registers. Support also exists for up to two 8K external
memory overlay spaces through the external data bus. All inter-
nal accesses complete in one cycle. Accesses to external memory
are timed using the wait-states specified by the DWAIT register
and the wait-state mode bit.
DATA MEMORY
DATA MEMORY
ALWAYS
ACCESSIBLE
AT ADDRESS
0 2000 – 0 3FFF
ACCESSIBLE WHEN
DMOVLAY = 0
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
32 MEMORY–
MAPPED
REGISTERS
INTERNAL
8160
WORDS
8K INTERNAL
DMOVLAY =
0, 4, 5, 6, 7
OR
EXTERNAL 8K
DMOVLAY = 1, 2
ADDRESS
0 3FFF
0 3FE0
0 3FDF
0 2000
0 1FFF
Program Memory,
Full Memory Mode
is a 24-bit-wide space
for storing both instruction op codes and data. The ADSP-2189M
has 32K words of Program Memory RAM on chip and the
capability of accessing up to two 8K external memory overlay
spaces using the external data bus.
Program Memory,
Host Mode
allows access to all internal
memory. External overlay access is limited by a single external
address line (A0). External program execution is not available in
host mode due to a restricted data bus that is 16-bits wide only.
Table III. PMOVLAY Bits
ACCESSIBLE WHEN
DMOVLAY = 4
ACCESSIBLE WHEN
DMOVLAY = 5
INTERNAL
MEMORY
0 0000
ACCESSIBLE WHEN
DMOVLAY = 6
ACCESSIBLE WHEN
DMOVLAY = 7
PMOVLAY
0, 4, 5
1
Memory
Internal
External
Overlay 1
External
Overlay 2
A13
A12:0
2
Not Applicable Not Applicable
0
13 LSBs of Address
Between 0x2000
and 0x3FFF
1
13 LSBs of Address
Between 0x2000
and 0x3FFF
ACCESSIBLE WHEN
DMOVLAY = 1
EXTERNAL
MEMORY
ACCESSIBLE WHEN
DMOVLAY = 2
Figure 5. Data Memory Map
–8–
REV. A
AD [ ANALOG DEVICES ]
