ADSP-2183KCA-210 データシートの表示（PDF） - Analog Devices

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ADSP-2183KCA-210

DSP Microcomputer

Analog Devices 

ADSP-2183

Memory Architecture

The ADSP-2183 provides a variety of memory and peripheral

interface options. The key functional groups are Program

Memory, Data Memory, Byte Memory and I/O.

Program Memory is a 24-bit-wide space for storing both

instruction opcodes and data. The ADSP-2183 has 16K words

of Program Memory RAM on chip and the capability of access-

ing up to two 8K external memory overlay spaces using the

external data bus. Both an instruction opcode and a data value

can be read from on-chip program memory in a single cycle.

Data Memory is a 16-bit-wide space used for the storage of

data variables and for memory-mapped control registers. The

ADSP-2183 has 16K words on Data Memory RAM on chip,

consisting of 16,352 user-accessible locations and 32 memory-

mapped registers. Support also exists for up to two 8K external

memory overlay spaces through the external data bus.

Byte Memory provides access to an 8-bit-wide memory space

through the Byte DMA (BDMA) port. The Byte Memory inter-

face provides access to 4 MBytes of memory by utilizing eight

data lines as additional address lines. This gives the BDMA Port

an effective 22-bit address range. On power-up, the DSP can

automatically load bootstrap code from byte memory.

I/O Space allows access to 2048 locations of 16-bit-wide data.

It is intended to be used to communicate with parallel periph-

eral devices such as data converters and external registers or

latches.

Program Memory

The ADSP-2183 contains a 16K × 24 on-chip program RAM.

The on-chip program memory is designed to allow up to two

accesses each cycle so that all operations can complete in a

single cycle. In addition, the ADSP-2183 allows the use of 8K

external memory overlays.

The program memory space organization is controlled by the

MMAP pin and the PMOVLAY register. Normally, the ADSP-

2183 is configured with MMAP = 0 and program memory orga-

nized as shown in Figure 4.

PROGRAM MEMORY

8K INTERNAL

(PMOVLAY = 0,

MMAP = 0)

OR

EXTERNAL 8K

(PMOVLAY = 1 or 2,

MMAP = 0)

ADDRESS

0x3FFF

0x2000

0x1FFF

8K INTERNAL

0x0000

Figure 4. Program Memory (MMAP = 0)

There are 16K words of memory accessible internally when the

PMOVLAY register is set to 0. When PMOVLAY is set to

something other than 0, external accesses occur at addresses

0x2000 through 0x3FFF. The external address is generated as

shown in Table II.

Table II.

PMOVLAY Memory A13

A12:0

0

Internal Not Applicable Not Applicable

1

External 0

Overlay 1

13 LSBs of Address

Between 0x2000

and 0x3FFF

2

External 1

Overlay 2

13 LSBs of Address

Between 0x2000

and 0x3FFF

This organization provides for two external 8K overlay segments

using only the normal 14 address bits. This allows for simple

program overlays using one of the two external segments in

place of the on-chip memory. Care must be taken in using this

overlay space because the processor core (i.e., the sequencer)

does not take the PMOVLAY register value into account. For

example, if a loop operation were occurring on one of the exter-

nal overlays, and the program changes to another external over-

lay or internal memory, an incorrect loop operation could occur.

In addition, care must be taken in interrupt service routines as

the overlay registers are not automatically saved and restored on

the processor mode stack.

For ADSP-2100 Family compatibility, MMAP = 1 is allowed.

In this mode, booting is disabled and overlay memory is dis-

abled (PMOVLAY must be 0). Figure 5 shows the memory map

in this configuration.

PROGRAM MEMORY

INTERNAL 8K

(PMOVLAY = 0,

MMAP = 1)

ADDRESS

0x3FFF

0x2000

0x1FFF

8K EXTERNAL

0x0000

Figure 5. Program Memory (MMAP = 1)

Data Memory

The ADSP-2183 has 16,352 16-bit words of internal data

memory. In addition, the ADSP-2183 allows the use of 8K

external memory overlays. Figure 6 shows the organization of

the data memory.

DATA MEMORY

32 MEMORY–

MAPPED REGISTERS

INTERNAL

8160 WORDS

8K INTERNAL

(DMOVLAY = 0)

OR

EXTERNAL 8K

(DMOVLAY = 1, 2)

ADDRESS

0x3FFF

0x3FEO

0x3FDF

0x2000

0x1FFF

0x0000

Figure 6. Data Memory

REV. C

–7–

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