XYCOM 82034CA
XYCOM 82034CA直到近年,SerDes 才拥有好于串行数据总线的功率优势。理想的并行总线消耗的功率是用于对 TX 和 RX 电容以及走线电容进行充电和放电的功率。当考虑 10、20 或 100 厘米的距离时,走线电容(trace capacitance)在 FR4 上可能很重要。
根据第一法则( first principles),我们知道 LVCMOS 链路的功率是 ~C*V^2*f。在数据的情况下,频率是总比特率乘以转换密度的二分之一。转换的总数和功率与一阶所需的通道数无关——通道越多,每条通道的转换越少。对于 1-Gb/s 链路,10 cm 到 1 m 可能需要 8-16 条通道。对于 10-Gb/s 链路,1 m 可能需要非常不切实际的 120 条通道!
XYCOM 82034CA
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