Visible to Intel only — GUID: mcn1398152825648
Ixiasoft
Visible to Intel only — GUID: mcn1398152825648
Ixiasoft
Glossary
Term | Definition |
---|---|
JTAG Timing Specifications | |
RL | Receiver differential input discrete resistor (external to Intel® MAX® 10 devices). |
RSKM (Receiver input skew margin) | HIGH-SPEED I/O block: The total margin left after accounting for the sampling window and TCCS. RSKM = (TUI – SW – TCCS) / 2. |
Sampling window (SW) | HIGH-SPEED I/O Block: The period of time during which the data must be valid to capture it correctly. The setup and hold times determine the ideal strobe position in the sampling window. |
Single-ended voltage referenced I/O standard | The AC input signal values indicate the voltage levels at which the receiver must meet its timing specifications. The DC input signal values indicate the voltage levels at which the final logic state of the receiver is unambiguously defined. After the receiver input crosses the AC value, the receiver changes to the new logic state. The new logic state is then maintained as long as the input stays beyond the DC threshold. This approach is intended to provide predictable receiver timing in the presence of input waveform ringing. |
tC | High-speed receiver/transmitter input and output clock period. |
TCCS (Channel-to- channel-skew) | HIGH-SPEED I/O block: The timing difference between the fastest and slowest output edges, including tCO variation and clock skew. The clock is included in the TCCS measurement. |
tcin | Delay from clock pad to I/O input register. |
tCO | Delay from clock pad to I/O output. |
tcout | Delay from clock pad to I/O output register. |
tDUTY | HIGH-SPEED I/O Block: Duty cycle on high-speed transmitter output clock. |
tFALL | Signal high-to-low transition time (80–20%). |
tH | Input register hold time. |
Timing Unit Interval (TUI) | HIGH-SPEED I/O block: The timing budget allowed for skew, propagation delays, and data sampling window. (TUI = 1/(Receiver Input Clock Frequency Multiplication Factor) = tC/w). |
tINJITTER | Period jitter on PLL clock input. |
tOUTJITTER_DEDCLK | Period jitter on dedicated clock output driven by a PLL. |
tOUTJITTER_IO | Period jitter on general purpose I/O driven by a PLL. |
tpllcin | Delay from PLL inclk pad to I/O input register. |
tpllcout | Delay from PLL inclk pad to I/O output register. |
tRISE | Signal low-to-high transition time (20–80%). |
tSU | Input register setup time. |
VCM(DC) | DC common mode input voltage. |
VDIF(AC) | AC differential input voltage: The minimum AC input differential voltage required for switching. |
VDIF(DC) | DC differential input voltage: The minimum DC input differential voltage required for switching. |
VHYS | Hysteresis for Schmitt trigger input. |
VICM | Input common mode voltage: The common mode of the differential signal at the receiver. |
VID | Input differential Voltage Swing: The difference in voltage between the positive and complementary conductors of a differential transmission at the receiver. |
VIH | Voltage input high: The minimum positive voltage applied to the input which is accepted by the device as a logic high. |
VIH(AC) | High-level AC input voltage. |
VIH(DC) | High-level DC input voltage. |
VIL | Voltage input low: The maximum positive voltage applied to the input which is accepted by the device as a logic low. |
VIL (AC) | Low-level AC input voltage. |
VIL (DC) | Low-level DC input voltage. |
VIN | DC input voltage. |
VOCM | Output common mode voltage: The common mode of the differential signal at the transmitter. |
VOD | Output differential voltage swing: The difference in voltage between the positive and complementary conductors of a differential transmission line at the transmitter. VOD = VOH – VOL. |
VOH | Voltage output high: The maximum positive voltage from an output which the device considers is accepted as the minimum positive high level. |
VOL | Voltage output low: The maximum positive voltage from an output which the device considers is accepted as the maximum positive low level. |
VOS | Output offset voltage: VOS = (VOH + VOL) / 2. |
VOX (AC) | AC differential Output cross point voltage: The voltage at which the differential output signals must cross. |
VREF | Reference voltage for SSTL, HSTL, and HSUL I/O Standards. |
VREF(AC) | AC input reference voltage for SSTL, HSTL, and HSUL I/O Standards. VREF(AC) = VREF(DC) + noise. The peak-to-peak AC noise on VREF should not exceed 2% of VREF(DC). |
VREF(DC) | DC input reference voltage for SSTL, HSTL, and HSUL I/O Standards. |
VSWING (AC) | AC differential input voltage: AC Input differential voltage required for switching. |
VSWING (DC) | DC differential input voltage: DC Input differential voltage required for switching. |
VTT | Termination voltage for SSTL, HSTL, and HSUL I/O Standards. |
VX (AC) | AC differential Input cross point voltage: The voltage at which the differential input signals must cross. |