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STLC4420A датащи(PDF) 37 Page - STMicroelectronics |
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STLC4420A датащи(HTML) 37 Page - STMicroelectronics |
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37 / 40 page ![]() STLC4420A Registers description 37/40 5.14 DMA read length register This 16 bit register is programmed with the maximum byte count of the next DMA Read transfer. Only the low-order 16 bits are used. The value programmed can be any number of bytes from 1 to 65535. A value of '0' disables the byte count logic, causing any transfers to continue until terminated by clearing the Enable bit. The format of the register is defined in Table 19. 5.15 DMA read base address register The DMA read base address is written to point to the first location for the DMA Data register read in the Devices AHB space. The address will be incremented after every Host access to the Data register. There is no restriction on the Base Address. Byte, Half-word, Word and QuadWord addresses are supported. The format of the register is defined in Table 20. Table 19. DMA read length register Bit number Name Description 31:16 Reserved 15:0 Data Length Maximum byte count Table 20. DMA read length register Bit number Name Description 31:0 DMA Read Base Address for 1st DMA read |
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