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GL811USB Datasheet(PDF) 23 Page - List of Unclassifed Manufacturers |
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GL811USB Datasheet(HTML) 23 Page - List of Unclassifed Manufacturers |
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23 / 36 page ![]() GL811USB – USB 2.0 to ATA / ATAPI Bridge Controller ©2000-2002 Genesys Logic Inc.—All rights reserved. Page 22 6.4.3 Ultra DMA data transfer 6.4.3.1 Ultra DMA data burst timing requirements Mode 0 (in ns) Mode 1 (in ns) Mode 2 (in ns) Mode 3 (in ns) Mode 4 (in ns) Name min max min max min max min max Min max Comment t2CYCTYP 240 160 120 90 60 Typical sustained average two cycle time tCYC 112 73 54 39 25 Cycle time allowing for asymmetry and clock variations t2CYC 230 154 115 86 57 Two cycle time allowing for clock variations tDS 15 10 7 7 5 Data setup time at recipient tDH 5 5 5 5 5 Data hold time at recipient tDVS 70 48 30 20 6 Data valid setup time at sender tDVH 6 6 6 6 6 Data valid hold time at sender tFS 0 230 0 200 0 170 0 130 0 120 First STORBE time tLI 0 150 0 150 0 150 0 100 0 100 Limited interlock time tMLI 20 20 20 20 20 Interlock time with minimum tUI 0 0 0 0 0 Unlimited interlock time tAZ 10 10 10 10 10 Maximum time allowed for output drivers to release tZAH 20 20 20 20 20 Minimum delay time required for output tZAD 0 0 0 0 0 Drivers to assert or negate tENV 20 70 20 70 20 70 20 55 20 55 Envelope time tSR 50 30 20 NA NA STROBE to DMARDY_ time tRFS 75 70 60 60 60 Ready to final STROBE time tRP 160 125 100 100 100 Minimum time to assert STOP or negate DMARQ tIORDYZ 20 20 20 20 20 Maximum time before releasing IORDY tZIORDY 0 0 0 0 0 Minimum time before driving STROBE tACK 20 20 20 20 20 Setup and hold times for DMACK_ tSS 50 50 50 50 50 Time from STROBE edge to negation of DMARQ or assertion of STOP |
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