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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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DS31256 数据表(PDF) 156 Page - Maxim Integrated Products |
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DS31256 数据表(HTML) 156 Page - Maxim Integrated Products |
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156 / 183 page  DS31256 256-Channel, High-Throughput HDLC Controller 156 of 183 Figure 11-6. 16-Bit Write Cycle Intel Mode (LIM = 0) Arbitration Enabled (LARBE = 1) Bus Transaction Time = 4 LCLK (LRDY = 0100) An attempted access by the host causes the local bus to request the bus. If bus access has not been granted ( LBGACK deasserted), the timing shown at the top of the page occurs, with LHOLD being asserted. Once LHLDA is detected, the local bus grabs the bus for 32 to 1,048,576 clocks and then releases it. If the bus has already been granted ( LBGACK asserted), the timing shown at the bottom of the page applies. LCLK LHOLD LHLDA LBGACK 32 to 1,048,576 LCLKs LA[19:0] LD[7:0] LD[15:8] LRD LWR Address Valid LBHE Data Valid Data Valid Tri-State Tri-State Tri-State Tri-State Tri-State Tri-State LCLK 1234 Note: LA, LD, LBHE, LWR, and LRD are tri-stated. |
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