1) 输出上拉校准,即校准输出电压VOH PU-Cal (Pull-up Calibration VOH Point) 2) 输入下拉驱动强度及接收终止电阻的校准 PDDS (Pull Down Drive Strength and Rx Termination) 3) DQ-ODT (DQ ODT Value) 4) CA-ODT (CA ODT Value) 2.3.2 ZQ校准的效果: 用外部的参考电阻对内部CMOS电阻阻值进行校准。
ZQCAL的4个作用: 1) 输出上拉校准,即校准输出电压VOH PU-Cal (Pull-up Calibration VOH Point) 2) 输入下拉驱动强度及接收终止电阻的校准 PDDS (Pull Down Drive Strength and Rx Termination) 3) DQ-ODT (DQ ODT Value) 4) CA-ODT (CA ODT Value) 2.3.2 ZQ 校准的效果: 用外部的参考电阻对内部CM...
• PU-Cal (Pull-up Calibration VOH Point) • PDDS (Pull Down Drive Strength and Rx Termination) • DQ-ODT (DQ ODT Value) • CA-ODT (CA ODT Value) ZQ校准是为了解决因为外界环境而引起的阻抗不匹配问题,通过调整内部电阻阻值实现,调节过程发生在device内部,controller只负责触发。有两个MPC[1...
1.1V High Speed LVCMOS 七:ZQ Calibration: 校准原因:输出驱动阻抗受制程,温度跟电压的影响,而校准能够提高信号的质量。 手段:硬件通过ZQ脚外接240欧姆1%电阻到VDDQ,而软件通过MPC指令可以初始化ZQ校准。 主要有以下几个: PU-Cal (Pull-up Calibration VOH Point) PDDS (Pull Down Drive Strength and Rx Termi...
PU-Cal (Pull-up Calibration VOH Point) PDDS (Pull Down Drive Strength and Rx Termination) DQ-ODT (DQ ODT Value) CA-ODT (CA ODT Value) 下拉电阻校准 上拉电阻校准 DQ-ODT (DQ ODT Value) 简单的来说就是DQ总线的片内终端匹配电阻,特别注意的是,这里的DQ是指DQ,DQS,DMI信号。
308 Figure 192: Pull-Up Calibration ... 309 CCM005-554574167-10682 z32m_embedded_lpddr4_lpddr4x.pdf – Rev. E 8/2020 EN 11 Micron Technology, Inc. reserves the right to change products or specifications without notice. © 2019 Micron Technology, Inc. All rights reserved. Micron Confidentia...
when I try run calibration. My PMIC is PCA9450B and I am not sure, but I guess for LPDDR4 this PMIC doesn't need any "pmic_set" instructions to work properly with this memory type. Or maybe I am wrong and should add something more to the PMIC config section ?Now...
--Set up the MMU and enable I and D cache--- This is the Cortex-A53 core- Check if I cache is enabled- Enabling I cache since it was disabled- Push base address of TTB to TTBR0_EL3- Config TCR_EL3- Config MAIR_EL3- Enable MMU- Data Cache ha...
1、LPDDR3、LPDDR4x 之间的比较 Items LPDDR3 LPDDR4x Feature CLK scheme Differential (CLK/CLKB)...
Pull-down Pull-up Characteristics w/ ZQ CalibrationAs is w/o ZQ CalibrationAs is w/ VOH ...