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DS_FT313H Datasheet(PDF) 52 Page - Future Technology Devices International Ltd. |
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DS_FT313H Datasheet(HTML) 52 Page - Future Technology Devices International Ltd. |
52 / 64 page Copyright © 2012 Future Technology Devices International Limited 52 Document No.: FT_000589 FT313H USB2.0 HS Host Controller Datasheet Version 1.1 Clearance No.: FTDI# 318 6.4.2 DMA timing DMA timing characteristics (Ambient Temperature = -40°C to +85°C) Parameter Description Min Max Unit Tsudreqdack DREQ Set-up Time before DACK Assertion 0 - ns Tddackdreq DACK De-assertion to Next DREQ Assertion Time 18 - ns Thdreqdack DREQ Hold Time after Last Strobe Assertion - 35 ns Trwp RD_N/WR_N Pulse Width 40 - ns Toe Data Valid Time after RD_N Assertion 8 - ns Trdh Read Data Hold Time after RD_N De- asserts 4 9 ns Twdh Write Data Hold Time after WR_N De- assertion 0 - ns Tdadvh Write Data Set-up Time before WR_N De-assertion 6 - ns Tsudackrw DACK Set-up Time before RD_N/WR_N Assertion 0 - ns Trwdack DACK De-assertion after RD_N/WR_N De-assertion 0 - ns Tcyc DMA Read/Write Cycle Time 80 - ns Table 6-13 DMA timing DREQ DACK RD_N/ WR_N DATA[15:0] (read) DATA[15:0] (write) Tsudreqdack Tsudackrw Trwp Tcyc Thdreqdack Tddackdreq Trwdack Toe Trdh Tdadvh Twdh DATA1 DATA2 DATAn Figure 6-7 DMA read and write |
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