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FT313HP-R 数据表(PDF) 56 Page - Future Technology Devices International Ltd. |
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FT313HP-R 数据表(HTML) 56 Page - Future Technology Devices International Ltd. |
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56 / 67 page  Copyright © 2013 Future Technology Devices International Limited 56 Document No.: FT_000589 FT313H USB2.0 HS Host Controller Datasheet Version 1.2 Clearance No.: FTDI# 318 If the microcontroller has no AD<0> pin for 16-bit wide devices, the unused AD<0> signal with must be terminated with an external 10k ohm pull-down resistor. If DMA transfers are not used the DACK and DREQ signals may be left floating or the DACK signal may be terminated with external 10k ohm pull-down resistor. 7.1.6 8-Bit General Multiplex asynchronous bus interface FT313H OE_N/RE_N/RD_N CS_E/CS_N WE_N/WR_N AD<7:0> A<7:0> INT DACK DREQ Microcontroller CS_N RE_N WE_N AD<7:0> INT DACK DREQ ADV_N/ALE ALE 8-Bit General Multiplex uses AD<7:0> signals as address and data bus. The unused high data bus AD<15:8> and A<7:0> address bus must be terminated with external 10k ohm pull-down resistors. If DMA transfers are not used the DACK and DREQ signals may be left floating or the DACK signal may be terminated with external 10k ohm pull-down resistor. |
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