PROASIC3E Datasheet, PDF (30/37 Pages) Actel Corporation – I/O Structures in IGLOOe and ProASIC3E Devices

I/O Structures in IGLOOe and ProASIC3E Devices
I/O Software Support
In Actel's Libero IDE software, default settings have been defined for the various I/O standards
supported. Changes can be made to the default settings via the use of attributes; however, not all
I/O attributes are applicable for all I/O standards. Table 16 lists the valid I/O attributes that can be
manipulated by the user for each I/O standard.
Single-ended I/O standards in low-power flash devices support up to five different drive
strengths.
Table 16 • IGLOOe and ProASIC3E I/O Attributes vs. I/O Standard Applications
I/O Standard
LVTTL/LVCMOS 3.3 V
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
LVCMOS 2.5 V
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
LVCMOS 2.5/5.0 V
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
LVCMOS 1.8 V
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
LVCMOS 1.5 V
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
PCI (3.3 V)
✓
✓
✓
✓
✓
PCI-X (3.3 V)
✓
✓
✓
✓
✓
✓
GTL+ (3.3 V)
✓
✓
✓
✓
✓
✓
GTL+ (2.5 V)
✓
✓
✓
✓
✓
✓
GTL (3.3 V)
✓
✓
✓
✓
✓
✓
GTL (2.5 V)
✓
✓
✓
✓
✓
✓
HSTL Class I
✓
✓
✓
✓
✓
✓
HSTL Class II
✓
✓
✓
✓
✓
✓
SSTL2 Class I and II
✓
✓
✓
✓
✓
✓
SSTL3 Class I and II
✓
✓
✓
✓
✓
✓
LVDS, B-LVDS, M-LVDS
✓
✓
✓
✓
✓
LVPECL
✓
✓
✓
✓
Table 17 on page 31 lists the default values for the above selectable I/O attributes as well as those
that are preset for each I/O standard.
Refer to Table 16 for SLEW and OUT_DRIVE settings. Table 18 on page 32 lists the voltages for the
supported I/O standards.
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