adsp-2188m Analog Devices, Inc., adsp-2188m Datasheet - Page 12

• Manufacturer Part Number: adsp-2188m
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

IACK Configuration
Mode D = 0 and in host mode: IACK is an active, driven signal
and cannot be “wire OR’d.”
Mode D = 1 and in host mode: IACK is an open drain and
requires an external pull-down, but multiple IACK pins can be
“wire OR’d” together.
MEMORY ARCHITECTURE
The ADSP-2188M 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-2188M.
PMOVLAY
0, 4, 5, 6, 7
1
2
ADSP-2188M
INTERNAL
ALWAYS
ACCESSIBLE
AT ADDRESS
0x0000 – 0x1FFF
ACCESSIBLE WHEN
PMOVLAY = 0
MEMORY
PM MODE B = 0
ACCESSIBLE WHEN
PMOVLAY = 4
PMOVLAY = 0, 4, 5, 6, 7
ACCESSIBLE WHEN
PMOVLAY = 5
PROGRAM MEMORY
PMOVLAY = 1, 2
8K EXTERNAL
8K INTERNAL
MODE B = 0
ACCESSIBLE WHEN
PMOVLAY = 6
INTERNAL
OR
8K
EXTERNAL
Memory
Internal
External Overlay 1
External Overlay 2
ACCESSIBLE WHEN
PMOVLAY = 7
MEMORY
0x2000 – 0x3FFF
ACCESSIBLE WHEN
PMOVLAY = 1
0x2000 – 0x3FFF
ADDRESS
ACCESSIBLE WHEN
PMOVLAY = 2
0 x 3FFF
0 x 1FFF
0x2000 – 0x3FFF
0 x 2000
0 x 0000
0x2000 – 0x3FFF
0x2000 – 0x3FFF
0 x 2000 – 0 x 3FFF
0 x 2000 – 0 x 3FFF
Table III. PMOVLAY Bits
A13
Not Applicable
0
1
2
NOTES
1
2
PM (MODE B = 1)
WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0
SEE TABLE III FOR PMOVLAY BITS
2
INTERNAL
ACCESSIBLE WHEN
PMOVLAY = 0
MEMORY
RESERVED
Program Memory
Program Memory (Full Memory Mode) is a 24-bit-wide
space for storing both instruction opcodes and data. The ADSP-
2188M has 48K words of Program Memory RAM on chip, and
the capability of accessing up to two 8K external memory over-
lay 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.
PROGRAM MEMORY
RESERVED
8K INTERNAL
PMOVLAY = 0
MODE B = 1
INTERNAL
1
RESERVED
8K
RESERVED
A12:0
Not Applicable
13 LSBs of Address Between 0x2000 and 0x3FFF
13 LSBs of Address Between 0x2000 and 0x3FFF
EXTERNAL
MEMORY
RESERVED
0x2000 – 0x3FFF
ACCESSIBLE WHEN
PMOVLAY = 0
ADDRESS
0 x 3FFF
0 x 1FFF
0 x 2000
0 x 0000
RESERVED
0 x 0000 – 0 x 1FFF
0 x 0000 – 0 x 1FFF
2
2