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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8270VR датащи(PDF) 17 Page - Freescale Semiconductor, Inc |
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MPC8270VR датащи(HTML) 17 Page - Freescale Semiconductor, Inc |
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17 / 83 page  MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2 Freescale Semiconductor 17 AC Electrical Characteristics This table lists CPM input characteristics. NOTE: Rise/Fall Time on CPM Input Pins It is recommended that the rise/fall time on CPM input pins should not exceed 5 ns. This should be enforced especially on clock signals. Rise time refers to signal transitions from 10% to 90% of VCC; fall time refers to transitions from 90% to 10% of VCC. NOTE Although the specifications generally reference the rising edge of the clock, the following AC timing diagrams also apply when the falling edge is the active edge. This figure shows the FCC internal clock. Figure 3. FCC Internal Clock Diagram Table 10. AC Characteristics for CPM Inputs1 1 Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN. Timings are measured at the pin. Spec Number Characteristic Value (ns) Setup Hold Setup Hold 66 MHz 83 MHz 100 MHz 66 MHz 83 MHz 100 MHz sp16a sp17a FCC inputs—internal clock (NMSI) 666000 sp16b sp17b FCC inputs—external clock (NMSI) 2.5 2.5 2.5 2 2 2 sp18a sp19a SCC/SMC/SPI/I2C inputs—internal clock (NMSI) 666000 sp18b sp19b SCC/SMC/SPI/I2C inputs—external clock (NMSI) 444222 sp20 sp21 TDM inputs/SI 5 5 5 2.5 2.5 2.5 sp22 sp23 PIO/TIMER/IDMA inputs 8 8 8 0.5 0.5 0.5 BRG_OUT FCC input signals FCC output signals FCC output signals Note: When GFMR.[TCI] = 1 Note: When GFMR[TCI] = 0 sp36a/sp37a sp36a/sp37a sp17a sp16a |
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