ADSP-2187L Analog Devices, ADSP-2187L Datasheet - Page 9

• Manufacturer Part Number: ADSP-2187L
• Description: DSP Microcomputer
• Manufacturer: Analog Devices

REV. 0
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.
PMOVLAY Memory
0, 4, 5
1
2
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-2187L has 32K words on Data
Memory RAM on chip, consisting of 16,352 user-accessible lo-
cations and 32 memory-mapped registers. Support also exists
for up to two 8K external memory overlay spaces through the
external data bus. All internal accesses complete in one cycle.
Accesses to external memory are timed using the wait states
specified by the DWAIT register.
Internal
External
Overlay 1
External
Overlay 2
Table III. PMOVLAY Bits
INTERNAL
MEMORY
A13
Not Applicable
0
1
PROGRAM MEMORY
ACCESSIBLE WHEN
PMOVLAY = 0, 4, 5
0 0000 – 0 1FFF
PMOVLAY = 1, 2
EXTERNAL
MEMORY
PM (MODE B = 0)
8K EXTERNAL
8K INTERNAL
8K INTERNAL
ACCESSIBLE
AT ADDRESS
PMOVLAY = 0
MODE B = 0
ACCESSIBLE WHEN
PMOVLAY = 4
ALWAYS
OR
ACCESSIBLE WHEN
PMOVLAY = 5
ACCESSIBLE WHEN
PMOVLAY = 1
A12:0
Not Applicable
13 LSBs of Address
Between 0x2000
and 0x3FFF
13 LSBs of Address
Between 0x2000
and 0x3FFF
ACCESSIBLE WHEN
PMOVLAY = 2
ADDRESS
0 2000–
0 3FFF
0 3FFF
0 2000
0 1FFF
0 0000
Figure 4. Program Memory
0 2000–
0 3FFF
0 2000–
0 3FFF
0 2000–
0 3FFF
0 2000–
0 3FFF
2
–9–
INTERNAL
MEMORY
2
Data Memory (Host Mode) allows access to all internal memory.
External overlay access is limited by a single external address line
(A0). The DMOVLAY bits are defined in Table IV.
DMOVLAY Memory A13
0, 4, 5
1
2
INTERNAL
MEMORY
PM (MODE B = 1)
ACCESSIBLE WHEN
PROGRAM MEMORY
1
2
EXTERNAL
MEMORY
WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0
SEE TABLE III FOR PMOVLAY BITS
PMOVLAY = 0
8K EXTERNAL
8K INTERNAL
PMOVLAY = 0
RESERVED
MODE B = 1
ACCESSIBLE WHEN
EXTERNAL
MEMORY
0 2000 – 0 3FFF
DATA MEMORY
AT ADDRESS
RESERVED
ACCESSIBLE
DMOVLAY = 0
ALWAYS
ACCESSIBLE WHEN
DMOVLAY = 4
RESERVED
ACCESSIBLE WHEN
PMOVLAY = 1
ACCESSIBLE WHEN
DMOVLAY = 5
1
Internal
External
Overlay 1
External
Overlay 2
Figure 5. Data Memory Map
ACCESSIBLE WHEN
DMOVLAY = 1
ADDRESS
0 2000–
0 3FFF
Table IV. DMOVLAY Bits
RESERVED
0 3FFF
0 1FFF
0 0000
0 2000
ACCESSIBLE WHEN
DMOVLAY = 2
0 2000–
0 1FFF
0 0000–
0 1FFF
Not Applicable
0
1
0 0000–
0 1FFF
0 0000–
0 1FFF
0 0000–
0 1FFF
2
0 0000–
0 1FFF
ADSP-2187L
DMOVLAY = 0, 4, 5
DATA MEMORY
DMOVLAY = 1, 2
EXTERNAL 8K
32 MEMORY
REGISTERS
8K INTERNAL
A12:0
Not Applicable
13 LSBs of Address
Between 0x2000
and 0x3FFF
13 LSBs of Address
Between 0x2000
and 0x3FFF
INTERNAL
MAPPED
WORDS
8160
OR
ADDRESS
0 3FFF
0 3FE0
0 3FDF
0 1FFF
0 2000
0 0000