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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8548ECPXATHC датащи(PDF) 46 Page - Freescale Semiconductor, Inc |
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MPC8548ECPXATHC датащи(HTML) 46 Page - Freescale Semiconductor, Inc |
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46 / 151 page  MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9 46 Freescale Semiconductor Local Bus NOTE PLL bypass mode is required when LBIU frequency is at or below 83 MHz. When LBIU operates above 83 MHz, LBIU PLL is recommended to be enabled. Figure 23 through Figure 28 show the local bus signals. Figure 23. Local Bus Signals (PLL Enabled) This table describes the timing parameters of the local bus interface at BVDD = 3.3 V with PLL disabled. Table 42. Local Bus Timing Parameters—PLL Bypassed Parameter Symbol1 Min Max Unit Notes Local bus cycle time tLBK 12 — ns 2 Local bus duty cycle tLBKH/tLBK 43 57 % — Internal launch/capture clock to LCLK delay tLBKHKT 2.3 4.4 ns 8 Input setup to local bus clock (except LGTA/LUPWAIT) tLBIVKH1 6.2 — ns 4, 5 LGTA/LUPWAIT input setup to local bus clock tLBIVKL2 6.1 — ns 4, 5 Input hold from local bus clock (except LGTA/LUPWAIT) tLBIXKH1 –1.8 — ns 4, 5 Output Signals: LA[27:31]/LBCTL/LBCKE/LOE/ LSDA10/LSDWE/LSDRAS/ LSDCAS/LSDDQM[0:3] tLBKHOV1 tLBKHOV2 tLBKHOV3 LSYNC_IN Input Signals: LAD[0:31]/LDP[0:3] Output (Data) Signals: LAD[0:31]/LDP[0:3] Output (Address) Signal: LAD[0:31] LALE tLBIXKH1 tLBIVKH1 tLBIVKH2 tLBIXKH2 tLBKHOX1 tLBKHOZ1 tLBKHOX2 tLBKHOZ2 Input Signal: LGTA tLBOTOT tLBKHOZ2 tLBKHOX2 tLBKHOV4 LUPWAIT |
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