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NET2890 数据表(PDF) 72 Page - List of Unclassifed Manufacturers |
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NET2890 数据表(HTML) 72 Page - List of Unclassifed Manufacturers |
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72 / 73 page ![]() Specification NET2890 USB Interface Controller ____________________________________________________________________________________ NetChip Technology, Inc., 1999 335 Pioneer Way, Mountain View, California 94041 TEL (650) 526-1490 FAX (650) 526-1494 http://www.netchip.com Rev 2.0, Draft 9, July 16, 1999 72 7.4.7 DMA Read from FIFO NAME DESCRIPTION MIN MAX UNIT T1 DRQ false from read enable true 42 64 ns T2 Read enable false to DRQ true 60 ns T9 Read enable width 25 ns T4 Data access time from read enable 23 ns T5 Data hold time from end of read enable 0 10 ns T6 Width of EOT# pulse (see note) 25 ns * Read enable is the occurrence of both IOR# and DACK#. Note: EOT#, IOR#, and DACK# must all be true for at least T6 for proper recognition of the EOT# pulse. T1 T2 T1 T9 T9 T4 T5 T4 T5 T6 D0 D1 0ns 50ns 100ns 150ns 200ns DRQ IOR#/DACK# D[7:0] EOT# |
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