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ADSP-2189MBST-266 Datasheet(PDF) 8 Page - Analog Devices |
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ADSP-2189MBST-266 Datasheet(HTML) 8 Page - Analog Devices |
8 / 32 page REV. 0 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 1 External 0 13 LSBs of Address Overlay 1 Between 0x2000 and 0x3FFF 2 External 1 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 OR 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 OR 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 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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