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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM7367 датащи(PDF) 306 Page - PMC-Sierra, Inc |
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PM7367 датащи(HTML) 306 Page - PMC-Sierra, Inc |
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306 / 323 page  PM7367 FREEDM-32P32 DATA SHEET PMC-1991499 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE 292 The PCI Bus Request Cycle Diagram (Figure 32) illustrates the case when the initiator is requesting the bus from the bus arbiter. When the FREEDM-32P32 is the initiator, it requests the PCI bus by asserting its REQB output to the central arbiter. The arbiter grants the bus to the FREEDM- 32P32 by asserting the GNTB line. The FREEDM-32P32 will wait till both the FRAMEB and IRDYB lines are idle before starting its access on the PCI bus. The arbiter can remove the GNTB signal at any time, but the FREEDM-32P32 will complete the current transfer before relinquishing the bus. Figure 32 – PCI Bus Request Cycle PCICLK REQB 12 34 56 T GNTB FRAMEB The PCI Initiator Abort Termination Diagram (Figure 33) illustrates the case when the initiator aborts a transaction on the PCI bus. An initiator may terminate a cycle if no target claims it within five clock cycles. A target may not have responded because it was incapable of dealing with the request or a bad address was generated by the initiator. IRDYB must be valid one clock after FRAMEB is deasserted as in a normal cycle. When the FREEDM-32P32 is the initiator and aborts the transaction, it reports the error condition to the PCI Host. |
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