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AM79C970AVCW 数据表(PDF) 39 Page - Advanced Micro Devices |
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AM79C970AVCW 数据表(HTML) 39 Page - Advanced Micro Devices |
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39 / 219 page  P R E L I M I N A R Y AMD 39 Am79C970A Disconnect When Locked When the PCnet-PCI II controller is locked by one master and another master tries to access the control- ler, the device will disconnect the access. When the PCnet-PCI II controller is in the locked state and it sees LOCK asserted together with FRAME, it knows that another master tried to access it. The PCnet-PCI II con- troller will respond to the access by asserting STOP to- gether with DEVSEL while driving TRDY high, thereby disconnecting the cycle. STOP will stay asserted until the other master removes FRAME. 19436A-12 FRAME CLK AD IRDY TRDY C/ BE DEVSEL STOP 1 23456 CMD PAR PAR PAR BE DATA ADDR LOCK Figure 9. Disconnect Of Slave Cycle When Locked |
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