IGLOOe Low Power Flash FPGAs
Revision 13
2-23
Summary of I/O Timing Characteristics – Default I/O Software
Settings
Table 2-23 Summary of AC Measuring Points
Standard
Input Reference
Voltage (VREF_TYP)
Board Termination
Voltage (VTT_REF)
Measuring Trip
Point (Vtrip)
3.3 V LVTTL / 3.3 V LVCMOS
–
1.4 V
3.3 V LVCMOS Wide Range
–
1.4 V
2.5 V LVCMOS
–
1.2 V
1.8 V LVCMOS
–
0.90 V
1.5 V LVCMOS
–
0.75 V
1.2 V LVCMOS*
–
0.6 V
1.2 V LVCMOS – Wide Range*
–
0.6 V
3.3 V PCI
–
0.285 * VCCI (RR)
–
0.615 * VCCI (FF))
3.3 V PCI-X
–
0.285 * VCCI (RR)
–
0.615 * VCCI (FF)
3.3 V GTL
0.8 V
1.2 V
VREF
2.5 V GTL
0.8 V
1.2 V
VREF
3.3 V GTL+
1.0 V
1.5 V
VREF
2.5 V GTL+
1.0 V
1.5 V
VREF
HSTL (I)
0.75 V
VREF
HSTL (II)
0.75 V
VREF
SSTL2 (I)
1.25 V
VREF
SSTL2 (II)
1.25 V
VREF
SSTL3 (I)
1.5 V
1.485 V
VREF
SSTL3 (II)
1.5 V
1.485 V
VREF
LVDS
–
Cross point
LVPECL
–
Cross point
Note: *Applicable to V2 devices ONLY operating in the 1.2 V core range.