Inputs Combinatorial tH(clock hold timb) ock Th Data Delay D Micro tH data H clk Clock Delay stH=Clock Delay + Micro tH- Data Delay
tH=Clock Delay + Micro tH - Data Delay tH (clock hold time)
tco(clock to output delay Micro tco C clk Data Delay Clock nela stco=Clock Delay+Micro Tco+Data Delay
tCO (Clock to output delay) tCO=Clock Delay+Micro Tco+Data Delay
时钟偏斜( clock skew):图示 Regl Reg2 3 ns delay〔 skew clk1 clk2 15 2 Setup Requirement 15 ns Hold Requirement=3 ns
时钟偏斜（clock skew）:图示
时钟偏斜( clock skew) e The difference in the arrival time of a clock signal at two different registers, o which can be caused by path length differences between two clock paths o or by using gated or rippled clocks Clock skew is the most common cause of internal hold violations, as shown in figure 1
时钟偏斜（clock skew） ❖ The difference in the arrival time of a clock signal at two different registers, ❖ which can be caused by path length differences between two clock paths, ❖ or by using gated or rippled clocks. ❖ Clock skew is the most common cause of internal hold violations, as shown in figure 1
引脚间延时tPD(pnto- pin delay) .o The time required for a signal from an input pin to propagate through combinational logic and appear at an external output pin 冷 In the Quartus‖ software, you can specify the required tPD for the entire project and/or for any cRinput pin, oUtput pin, cR bidirectional pin .o You can also assign a point-to-point tPD assignment to specify the required delay between R an input pin and a register, cR a register and a register, Ra register and an output pin
引脚间延时tPD (pin-to-pin delay) ❖ The time required for a signal from an input pin to propagate through combinational logic and appear at an external output pin. ❖ In the Quartus® II software, you can specify the required tPD for the entire project and/or for any input pin, output pin, bidirectional pin. ❖ You can also assign a point-to-point tPD assignment to specify the required delay between an input pin and a register, a register and a register, a register and an output pin