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沒光（Micron）的講法 R% @% I5 ]/ A% U
With a single DIMM placed at the end of the motherboard bus, the system is matched throughout. The driver impedance could be as much as 40Ω, but is generally set a little lower; the motherboard is routed at 40Ω; and the DIMM lead-in, which is about 4 inches, is routed at 40Ω. DRAM-to-DRAM routing is 60Ω, but when the additional capacitance of the DRAM devices is taken into account, this lead-in becomes an effective 40Ω impedance. The termination resistor to VTT is 39Ω. This configuration provides fast slew rates and clean edge transitions due to the minimal number of reflections.3 X3 s# l, [8 B1 y/ t- V( t
# s0 y6 B0 `+ A: |3 M0 Y) N |
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发表于 2016-7-6 13:08
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发表于 2016-7-7 18:00
