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ADSP-2185LBST-160 Arkusz danych(PDF) 8 Page - Analog Devices |
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ADSP-2185LBST-160 Arkusz danych(HTML) 8 Page - Analog Devices |
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8 / 31 page  REV. A ADSP-2185L –8– Table II. Modes of Operations 1 MODE C 2 MODE B 3 MODE A 4 Booting Method 0 0 0 BDMA feature is used to load the first 32 program memory words from the byte memory space. Program execution is held off until all 32 words have been loaded. Chip is configured in Full Memory Mode. 5 0 1 0 No Automatic boot operations occur. Program execution starts at external memory location 0. Chip is configured in Full Memory Mode. BDMA can still be used, but the processor does not automatically use or wait for these operations. 1 0 0 BDMA feature is used to load the first 32 program memory words from the byte memory space. Program execution is held off until all 32 words have been loaded. Chip is config- ured in Host Mode. (REQUIRES ADDITIONAL HARDWARE.) 1 0 1 IDMA feature is used to load any internal memory as desired. Program execution is held off until internal program memory location 0 is written to. Chip is configured in Host Mode. 5 NOTES 1All mode pins are recognized while RESET is active (low). 2When Mode C = 0, Full Memory enabled. When Mode C = 1, Host Memory Mode enabled. 3When Mode B = 0, Auto Booting enabled. When Mode B = 1, no Auto Booting. 4When Mode A = 0, BDMA enabled. When Mode A = 1, IDMA enabled. 5Considered as standard operating settings. Using these configurations allows for easier design and better memory management. MEMORY ARCHITECTURE The ADSP-2185L 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 alloca- tions in the ADSP-2185L. PROGRAM MEMORY Program Memory (Full Memory Mode) is a 24-bit-wide space for storing both instruction opcodes and data. The ADSP-2185L has 16K 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 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 ACCESSIBLE WHEN PMOVLAY = 2 ACCESSIBLE WHEN PMOVLAY = 1 ALWAYS ACCESSIBLE AT ADDRESS 0x0000 – 0x1FFF ACCESSIBLE WHEN PMOVLAY = 0 PM (MODE B = 0) INTERNAL MEMORY EXTERNAL MEMORY 0x2000– 0x3FFF 0x2000– 0x3FFF2 0x2000– 0x3FFF2 8K INTERNAL PMOVLAY = 0 8K EXTERNAL PROGRAM MEMORY MODE B = 1 ADDRESS 0x3FFF 0x2000 0x1FFF 0x0000 8K INTERNAL PMOVLAY = 0 OR 8K EXTERNAL PMOVLAY = 1 OR 2 0x3FFF 0x2000 0x1FFF 8K INTERNAL 0x0000 PROGRAM MEMORY MODE B = 0 ADDRESS ACCESSIBLE WHEN PMOVLAY = 0 INTERNAL MEMORY EXTERNAL MEMORY 0x2000– 0x3FFF 0x0000– 0x1FFF2 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 Figure 4. Program Memory |
Podobny numer części - ADSP-2185LBST-160 |
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Podobny opis - ADSP-2185LBST-160 |
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