ADSP-2189M datasheet(8/32 Pages) AD

8 / 32 page

REV. A

ADSP-2189M

–8–

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

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

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

PMOVLAY

Memory

A13

A12:0

0, 4, 5

Internal

Not Applicable Not Applicable

External

13 LSBs of Address

Overlay 1

Between 0x2000

and 0x3FFF

External

13 LSBs of Address

Overlay 2

Between 0x2000

and 0x3FFF

Data 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.

ACCESSIBLE WHEN

DMOVLAY = 2

ACCESSIBLE WHEN

DMOVLAY = 1

0 0000–

0 1FFF

0 0000–

0 1FFF

EXTERNAL

MEMORY

32 MEMORY–

MAPPED

REGISTERS

0 3FFF

0 2000

0 1FFF

INTERNAL

8160

WORDS

0 0000

DATA MEMORY

ADDRESS

INTERNAL

MEMORY

8K INTERNAL

DMOVLAY =

0, 4, 5, 6, 7

EXTERNAL 8K

DMOVLAY = 1, 2

0 3FE0

0 3FDF

DATA MEMORY

ACCESSIBLE WHEN

DMOVLAY = 7

ACCESSIBLE WHEN

DMOVLAY = 6

0 0000–

0 1FFF

0 0000–

0 1FFF

ACCESSIBLE WHEN

DMOVLAY = 5

ALWAYS

ACCESSIBLE

AT ADDRESS

0 2000 – 0 3FFF

ACCESSIBLE WHEN

DMOVLAY = 0

ACCESSIBLE WHEN

DMOVLAY = 4

0 0000–

0 1FFF

0 0000–

0 1FFF

0 0000–

0 1FFF

Figure 5. Data Memory Map

ACCESSIBLE WHEN

PMOVLAY = 2

ACCESSIBLE WHEN

PMOVLAY = 1

ACCESSIBLE WHEN

PMOVLAY = 5

ALWAYS

ACCESSIBLE

AT ADDRESS

0 0000 – 0 1FFF

ACCESSIBLE WHEN

PMOVLAY = 0

ACCESSIBLE WHEN

PMOVLAY = 4

INTERNAL

MEMORY

EXTERNAL

MEMORY

0 2000–

0 3FFF

0 2000–

0 3FFF

0 2000–

0 3FFF

0 2000–

0 3FFF2

0 2000–

0 3FFF2

PM (MODE B = 0)

8K INTERNAL

PMOVLAY = 0

8K EXTERNAL

PROGRAM MEMORY

MODE B = 1

ADDRESS

0 3FFF

0 2000

0 1FFF

0 0000

8K INTERNAL

PMOVLAY = 0, 4, 5

8K EXTERNAL

PMOVLAY = 1, 2

0 3FFF

0 2000

0 1FFF

8K INTERNAL

0 0000

PROGRAM MEMORY

MODE B = 0

ADDRESS

ACCESSIBLE WHEN

PMOVLAY = 1

RESERVED

INTERNAL

MEMORY

EXTERNAL

MEMORY

0 2000–

0 3FFF

0 0000–

0 1FFF2

PM (MODE B = 1)1

RESERVED

1WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0

2SEE TABLE III FOR PMOVLAY BITS

ACCESSIBLE WHEN

PMOVLAY = 0

RESERVED

0 0000–

0 1FFF2

Figure 4. Program Memory

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