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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC5121E датащи(PDF) 34 Page - Freescale Semiconductor, Inc |
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MPC5121E датащи(HTML) 34 Page - Freescale Semiconductor, Inc |
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34 / 86 page  MPC5121E/MPC5123 Data Sheet, Rev. 4 Electrical and Thermal Characteristics Freescale Semiconductor 34 Figure 9 and Figure 10 shows the DDR SDRAM read timing Figure 9. DDR Read Timing, DQ vs DQS Figure 10. DDR Read Timing, DQSEN Figure 11 provides the AC test load for the DDR bus. Figure 11. DDR AC Test Load 3.3.6 PCI The PCI interface on the MPC5121e/MPC5123 is designed to PCI Version 2.3 and supports 33 and 66 MHz PCI operations. See the PCI Local Bus Specification; the component section specifies the electrical and timing parameters for PCI components with the intent that components connect directly together whether on the planar or an expansion board, without any external buffers or other glue logic. Parameters apply at the package pins, not at expansion board edge connectors. The PCI_CLK is used as output clock, the MPC5121e/MPC5123 is a PCI host device only. Figure 12 shows the clock waveform and required measurement points for 3.3 V signaling environments. Table 21 summarizes the clock specifications. DQS(in) Any DQ(in) tDQSQ tDQSQ MCK DQS (in) tOS tOH Command Address Read tDQSEN (min) tDQSEN Output Z0 =50 Ω RL = 50 Ω VDD_MEM_IO/2 |
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