DRAM的一些电压参数VDD VDDQ VPP剖析
VDD:北桥芯片供电电压或者存储芯片的输入缓冲和核心逻辑的供电电压。
VDDQ:存储芯片的输出缓冲供电电压。
VPP:DDR4中VPP电压的作用是为字位线提供电压,需要外供,DDR4 SDRAM 不用内建 电荷泵Charge pump,为了省功耗;
DDR3本身也需要的,在DDR3 SDRAM内部有电压泵,不需要外供。
VCore: The core supply voltage of an 'important' chip like your CPU or GPU, usually not the Northbridge. Most frequently used to indicate CPU voltage.
VDD: The supply voltage to your Northbridge chip or the supply voltage for the input buffers and core logic of your memory chips (mostly on graphic cards).
VDDQ: The supply voltage to the output buffers of a memory chip.
VTT: Tracking Termination Voltage. Compared to VREF to determine Hi/Lo
VMem: Supply voltage to a memory chip.
VDDR, VDimm: Supply voltage to the memory on your motherboard.
VRef: Reference voltage for the input lines of a chip that determines the voltage level at which the threshold between a logical 1 and a logical 0 occurs. Usually 1/2 VDDQ.
VGPU: The supply voltage to your graphic card's processor.
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