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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 63 Page - STMicroelectronics |
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RM0319 датащи(HTML) 63 Page - STMicroelectronics |
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63 / 368 page  RM0319 Multiport DDR controller (MPMC) Doc ID 022640 Rev 3 63/368 AHB memory controller transaction mapping equations For AHB ports, a WORD is defined as 32 bits (4 bytes) and is the maximum size supported for a 32 bit AHB port. Table 18 shows examples of the mapping of various AHB transaction bursts and sizes to the corresponding core transaction lengths for a 32 bit wide AHB port interface. BYTE 0x4 0x------Aa-------- BYTE 0x5 0x----Aa---------- BYTE 0x6 0x--Aa------------ BYTE 0x7 0xAa-------------- HALF WORD 0x0 0x------------BbAa HALF WORD 0x2 0x--------BbAa---- HALF WORD 0x4 0x----BbAa-------- HALF WORD 0x6 0xBbAa------------ WORD 0x0 0x--------DdCcBbAa WORD 0x4 0xDdCcBbAa-------- Table 17. READ/WRITE data alignment - Big Endian Transaction type Address Data alignment - big endian BYTE 0x0 0xAa-------------- BYTE 0x1 0x--Aa------------ BYTE 0x2 0x----Aa---------- BYTE 0x3 0x------Aa-------- BYTE 0x4 0x--------Aa------ BYTE 0x5 0x----------Aa---- BYTE 0x6 0x------------Aa-- BYTE 0x7 0x--------------Aa HALF WORD 0x0 0xAaBb------------ HALF WORD 0x2 0x----AaBb-------- HALF WORD 0x4 0x--------AaBb---- HALF WORD 0x6 0x------------AaBb WORD 0x0 0xAaBbCcDd-------- WORD 0x4 0x--------AaBbCcDd Table 16. READ/WRITE data alignment - Little Endian (continued) Transaction type Address Data alignment - little endian |
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