Hi, I would like to connect to Arria II Gx a DDR3 device via SSTL-15 class 1 interface. I've opened up the spec of Arria II Gx (see
I did a test on an existing board with LVDS input. I switched the IO-standard to differential SSTL-2 class I and supplied a variable VREF voltage. The circuit behaves as if CLK_P input is compared with VREF while CLK_N is ignored. Switching to single-ended SSTL-2 results in identic...
15. The I/O interface of claim 1, wherein the input circuit includes a differential amplifier coupled to the pad for receiving differential input data signals. Description: FIELD OF THE INVENTION The present invention relates generally to interfaces for integrated circuits and, more particularly, to...
i am using cyclone ii fpga to interface to ddr ram. by the handbook of cyclone ii, it's top and bottom banks support sstl_2 class i and ii io standards. so what's the internal differences(just at the output buffer) in fpga between ...
I switched the IO-standard to differential SSTL-2 class I and supplied a variable VREF voltage. The circuit behaves as if CLK_P input is compared with VREF while CLK_N is ignored. Switching to single-ended SSTL-2 results in identical behaviour, also identical VREF margins. Seems li...
SSTL-15 Class I, II1.4251.51.5750.220VCCIO/2 – 0.15—VCCIO/2 + 0.152(VIH(AC)– VREF)2(VIL(AC)– VREF) SSTL-1351.2831.351.450.1820VCCIO/2 – 0.15VCCIO/2VCCIO/2 + 0.152(VIH(AC)– VREF)2(VIL(AC)– VREF) SSTL-1251.191.251.310.1820VCCIO/2 – 0.15VCCIO/2VCCIO/2 + 0.152(VIH(AC...
HSTL-18 Class I, II 1.71 1.8 1.89 0.85 0.9 0.95 0.85 0.9 0.95 HSTL-15 Class I, II 1.425 1.5 1.575 0.71 0.75 0.79 0.71 0.75 0.79 HSTL-12 Class I, II 1.14 1.2 1.26 0.48 × VCCIO 16 0.5 × VCCIO 16 0.52 × VCCIO 16 — 0.5 × VCCIO — 0.47 × VCCIO 17 0.5 × VC...