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MPFS250T 数据表(PDF) 44 Page - Microchip Technology |
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MPFS250T 数据表(HTML) 44 Page - Microchip Technology |
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44 / 128 page  Table 55 • Timers Units Max Min Symbol Parameters MHz 250 FTIMERCLK Timer input clock fre- quency 6.1.15 Fabric Interface The following tables describe the fabric interface. Table 56 • Maximum Clock Frequency Units Max Min Symbol Parameter MHz 250 FFABRICAXICLK AXI MHz 250 FFABRICAHBCLK APB 6.2 I/O Standards Specifications This section describes I/O delay measurement methodology, buffer speed, switching characteristics, digital latency, gearing training calibration, and maximum physical interface (PHY) rate for memory interface IP. 6.2.1 Input Delay Measurement Methodology Maximum PHY Rate for Memory Interface IP The following table provides information about the methodology for input delay measurement. Table 57 • Input Delay Measurement Methodology Unit VREF 1, 5 VMEAS 3, 4 VICM 2 VID 2 VH 1 VL 1 Description Standard V VDDI/2 VDDI 0 PCIE 3.3 V PCI V VDDI/2 VDDI 0 LVTTL 3.3 V LVTTL V VDDI/2 VDDI 0 LVCMOS 3.3 V LVCMOS33 V VDDI/2 VDDI 0 LVCMOS 2.5 V LVCMOS25 V VDDI/2 VDDI 0 LVCMOS 1.8 V LVCMOS18 V VDDI/2 VDDI 0 LVCMOS 1.5 V LVCMOS15 V VDDI/2 VDDI 0 LVCMOS 1.2 V LVCMOS12 V 1.25 VREF VREF + 0.5 VREF – 0.5 SSTL 2.5 V Class I SSTL25I V 1.25 VREF VREF + 0.5 VREF – 0.5 SSTL 2.5 V Class II SSTL25II 40 Microsemi Proprietary and Confidential. DS0147 Revision 1.0 AC Switching Characteristics |
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