Visible to Intel only — GUID: mcn1465805900670
Ixiasoft
Visible to Intel only — GUID: mcn1465805900670
Ixiasoft
AS Configuration Timing
Symbol | Description | Minimum | Typical | Maximum | Unit | |
---|---|---|---|---|---|---|
Tclk 163 | AS_CLK clock period | — | 8 | — | ns | |
Tdutycycle | AS_CLK duty cycle | 45 | 50 | 55 | % | |
Tdcsfrs | AS_nCSO[3:0] asserted to first AS_CLK edge | 11.65 | — | — | ns | |
Tdcslst | Last AS_CLK edge to AS_nCSO[3:0] deasserted | 9.23 | — | — | ns | |
Tdo 164 | AS_DATA[3:0] output delay | –1.5 | — | 1.31 | ns | |
Text_delay 165 166 167 | Total external propagation delay on AS signals | 0 | — | 18 | ns | |
Tdcsb2b | Minimum delay of slave select deassertion between two back-to-back transfers | 62 | — | — | ns |
Load capacitance for DCLK = 10 pF and AS_DATA = 18 pF. Intel recommends obtaining the Tdo for a given link (including receiver, transmission lines, connectors, termination resistors, and other components) through IBIS or HSPICE simulation.
Use the following equations to do static timing analysis for flash setup/hold timing.
- To analyze flash setup time, Tsu = AS_CLK/2 – Tdo(max) + Tbd_clk – Tbd_data(max)
- To analyze flash hold time, Tho = AS_CLK/2 + Tdo(min) – Tbd_clk + Tbd_data(min)
Text_delay = Tbd_clk + Tco + Tbd_data + Tadd
Tbd_clk: Propagation delay for AS_CLK between FPGA and flash device.
Tco: Output hold time and clock low to output valid of flash device. This delay must be used to ensure Text_delay is within the minimum and maximum specification values.
Tbd_data: Propagation delay for AS_DATA bus between FPGA and flash device.
Tadd: Propagation delay for active/passive components on AS_DATA interfaces.