由clock gating的结构可知,大部分clock gating check 都可以归类到AND type clock gating check 或 OR type clock gating check.另类的由XOR跟MUX。 AND type clock gating check: 即高电平有效clock gating check, 当enable 信号为"1" 时,门控打开,clock 『流过』gating cell. 当enable 信号为"0" 时,门控...
A method extends a clock-gating technique to provide a sleep signal for controlling switch circuits that reduce active leakage power. Using this extension of the clock-gating technique, fine-grained power-gating is achieved. The method a... M Mamidipaka - US 被引量: 35发表: 2010年 Clock ...
在实际芯片中,时钟网络除了包含inv和buffer,还包含clock gating。 例如,如果时钟信号作为逻辑AND门的一个输入,控制信号用作另一个输入,输出就是门控时钟信号 对于上述基于AND门的clock gating,该工具不会自动检查该门控时钟的setup和hold time。此时,时序不满足要求,可能会产生不完整的时钟信号。 要检查这种门控时钟...
A single clock gate can be used to control multiple timing-exception paths, so the amount of X-bounding circuitry inserted into the IC can be drastically reduced compared to that required by conventional X-bounding methodologies.Priya Khandelwal...
下图所示电路存在timing loops。如果design存在这样的情况,我们必须使用set_disable_timing自己把这个loop断掉,否则工具会自己断,可能会出现工具判断的情况和我们预期不一样的情况。因为工具在分析时序时不支持timing loop! no_clock 检查是否有时序单元的clock pin不在任何时钟网络上。比如某个寄存器的CK是接到某个data...
Hi guys, I am using clock gating in cadence RTL compiler, but there is no ICG cell in the library. So I implemented an ICG cell with verilog code, which is active
I'm trying to close timing on a design which uses a lot of clock gating throughout the design. I believe the mapper does not read in a specified SDC file, but the fitter will use the SDC file during place and route. Are all constraints used by the fitter? ...
constraints merger block440identifies such a node as an actual clock-shaping node. The clock-unateness inferred can be one of positive, negative or both, depending on whether the set of enabled arcs include respectively only positive unate arcs, only negative unate arcs or both. If arcs of una...
如果用户用set_clock_gating_check 设置的clock gating check 跟工具推断出的clock gating check 的类型不一致,工具通常会报警告,并且以用户的设置做check. 用set_clock_gating_check 设置的setup/hold 值要比library 中定义的值优先级高。 用命令set_disable_clock_gating_check 可以disable 掉某些不需要做的clock...
This analysis can drive the introduction of clock gating, an increasingly popular technique for reducing dynamic power dissipation. 关键词: Theoretical or Mathematical, Experimental/ delays integrated circuit design low-power electronics power supply circuits timing circuits/ local power supply voltage power...