DDR2核心技术解析

2021年7月3日 — OCD (off-chip driver)是指輸出級的強度，傳統的GPIO的輸出級強度是用 ... 例如DDR3 34-ohm OCD，就可用並聯7個240 ohm的output driver來實現。至於 ...

2017年10月10日 — DDR2的OCD技术. 1、片外驱动调校（OCD，Off-Chip Driver）. OCD是在DDR2开始加入的新功能，而且这个功能是可选的。OCD的主要作用在于调整I/O接口端的 ...

2010年1月22日 — Hi, I am implementing Off-chip driver calibration in the DDR2 memory controller design on Altera Cyclone III EP3C120 board and am struck in ...

At least 200 clocks after step 8, execute OCD calibration (Off Chip Driver impedance adjustment). ... Off-Chip Driver (OCD) Impedance Adjustment. DDR2 SDRAM ...

OCD is used to adjust the impedance value of the DRAM's internal output driver. This function can adjust the voltage to equalize the pull-up resistance and pull ...

(Off-Chip Driver) 離線驅動調整：OCD 的主要用意在於調整I/O 接口端的電壓，來補償上拉與下拉電阻值。目的是讓DQS 與DQ 數據信號之間的偏差降低到最小。

The present invention is an Off Chip Driver (OCD) having a high, a low and a high impedance (Hi-Z) state. The OCD includes an up-level pre-drive, a down-level ...

OCD in Fig. 8 is composed of multiple binary weighted subdrivers to provide controllable driver strength by selectively enabling the subdrivers. The signals DON ...

由 N Raver 著作 · 1987 · 被引用 40 次 — Open-loop gain limitations are described for a novel type of off-chip driver (OCD). This OCD uses feedback to make the output signal track an internal ramp.