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ST20-GP1 数据表(PDF) 55 Page - STMicroelectronics |
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ST20-GP1 数据表(HTML) 55 Page - STMicroelectronics |
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55 / 116 page ![]() ST20-GP1 55/116 ® Key: L = low for whole access H = high for whole access A = active on write accesses I = inactive for whole access The EMI buffers subsequent transactions which may occur, without intervening dead cycles except Bus width Valid bytes <3:0> Number of accesses required MemAddr1 notMemWB1 notMemWB0 123412341234 8 0001 1 L - - - L - - - A - - - 8 0010 1 L - - - H - - - A - - - 8 0011 2 L L - - L H - - A A - - 8 0100 1 H - - - L - - - A - - - 8 0101 2 L H - - L L - - A A - - 8 0110 2 L H - - H L - - A A - - 8 0111 3 L L H - L H L - A A A - 8 1000 1 H - - - H - - - A - - - 8 1001 2 L H - - L H - - A A - - 8 1010 2 L H - - H H - - A A - - 8 1011 3 L L H - L H H - A A A - 8 1100 2 H H - - L H - - A A - - 8 1101 3 L H H - L L H - A A A - 8 1110 3 L H H - H L H - A A A - 8 1111 4 L L H H L H L H A A A A 16 0001 1 L - - - I - - - A - - - 16 0010 1 L - - - A - - - I - - - 16 0011 1 L - - - A - - - A - - - 16 0100 1 H - - - I - - - A - - - 16 0101 2 L H - - I I - - A A - - 16 0110 2 L H - - A I - - I A - - 16 0111 2 L H - - A I - - A A - - 16 1000 1 H - - - A - - - I - - - 16 1001 2 L H - - I A - - A I - - 16 1010 2 L H - - A A - - I I - - 16 1011 2 L H - - A A - - A I - - 16 1100 1 H - - - A - - - A - - - 16 1101 2 L H - - I A - - A A - - 16 1110 2 L H - - A A - - I A - - 16 1111 2 L H - - A A - - A A - - Table 9.3 Transaction composition for valid bytes on internal memory bus |
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