Visible to Intel only — GUID: smy1599800688002
Ixiasoft
Visible to Intel only — GUID: smy1599800688002
Ixiasoft
5.5.6.4.4. Timing Closure: Non Edge-Aligned Input Data
If the input data is not edge-aligned, use the following equation to calculate the new Input Strobe Setup Delay Constraint and Input Strobe Hold Delay Constraint values:
New Input Strobe Setup Delay Constraint Value = Clock to data skew - Input Strobe Phase Shift (nanosecond)
New Input Strobe Hold Delay Constraint Value = Clock to data skew + Input Strobe Phase Shift (nanosecond)
For example, if the memory speed is 800 MHz and the clock to data skew value is 0.1 with input data phase shift of 90°:
New Input Strobe Setup Delay Constraint value = 0.1-1.25*(90/360) = -0.2125ns.
New Input Strobe Hold Delay Constraint value = 0.1 + 1.25*(90/360) = 0.4125ns