7
LatticeXP2 Advanced
Lattice Semiconductor
Evaluation Board User’s Guide
Table 7. Mixed Voltage I/O Support
V
CCIO
Input sysIO Standards
Output sysIO Standards
1.2V
1.5V
1.8V
2.5V
3.3V
1.2V
1.5V
1.8V
2.5V
3.3V
1.2V
Yes
Yes
Yes
Yes
1.5V
Yes
Yes
Yes
Yes
Yes
1.8V
Yes
Yes
Yes
Yes
Yes
2.5V
Yes
Yes
Yes
Yes
3.3V
Yes
Yes
Yes
Yes
For example, if V
CCIO
is 3.3V then signals from devices powered by 1.2V, 2.5V, or 3.3V can be input and the thresh-
olds will be correct, assuming the user has selected the desired input level using ispLEVER
®
software. Output lev-
els are tied directly to V
CCIO.
Table 8. sysIO Standards Supported per Bank
Description
Top Side, Banks 0-1
Right Side, Banks 2-3
Bottom Side, Banks 4-5
Left Side, Banks 6-7
Types of I/O Buffers
Single-ended
Single-ended and
Differential
Single-ended
Single-ended and
Differential
Output standards
supported
LVTTL
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
LVCMOS12
SSTL18 Class I, II
SSTL25 Class I, II
SSTL33 Class I, II
HSTL15 Class I
HSTL18_I, II
SSTL18D Class I, II
SSTL25D Class I, II
SSTL33D Class I, II
HSTL15D Class I
HSTL18D Class I, II
PCI33
LVDS25E
1
LVPECL
1
BLVDS
1
RSDS
1
LVTTL
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
LVCMOS12
SSTL18 Class I, II
SSTL25 Class I, II
SSTL33 Class I, II
HSTL15 Class I
HSTL18 Class I, II
SSTL18D Class I, II
SSTL25D Class I, II
SSTL33D Class I, II
HSTL15D Class I, II
HSTL18D Class I, II
PCI33
LVDS
LVDS25E
1
LVPECL
1
BLVDS
1
RSDS
1
LVTTL
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
LVCMOS12
SSTL18 Class I
SSTL2 Class I, II
SSTL3 Class I, II
HSTL15 Class I
HSTL18 Class I, II
SSTL18D Class I, II
SSTL25D Class I, II,
SSTL33D Class I, II
HSTL15D Class I
HSTL18D Class I, II
PCI33
LVDS25E
1
LVPECL
1
BLVDS
1
RSDS
1
LVTTL
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
LVCMOS12
SSTL18 Class I
SSTL2 Class I, II
SSTL3 Class I, II
HSTL15 Class I, III
HSTL18 Class I, II, III
SSTL18D Class I,
SSTL25D Class I, II,
SSTL33D_I, II
HSTL15D Class I
HSTL18D Class I, II
PCI33
LVDS
LVDS25E
1
LVPECL
1
BLVDS
1
RSDS
1
Inputs
All Single-ended,
Differential
All Single-ended,
Differential
All Single-ended,
Differential
All Single-ended,
Differential
Clock Inputs
All Single-ended,
Differential
All Single-ended,
Differential
All Single-ended,
Differential
All Single-ended,
Differential
PCI Support
PCI33 no clamp
PCI33 no clamp
PCI33 with clamp
PCI33 no clamp
LVDS Output Buffers
LVDS (3.5mA) Buffers
2
LVDS (3.5mA) Buffers
2
1. These differential standards are implemented by using complementary LVCMOS drivers and external resistors.
2. Available on 50% of the I/Os in the bank.