10
LatticeECP2 Standard Evaluation Board
Lattice Semiconductor
User’s Guide
Table 23. 3.3V to V
CCAUX
The LatticeECP2 is divided into 10 banks of I/Os (see Table 24), and each of these banks has a separate and inde-
pendent V
CC.
Each bank supports voltages from 1.2V to 3.3V. However, because some banks, such as banks 4
and 5, which connect to PCI/PCI-X, require a fixed voltage, not all of the banks on this evaluation board are adjust-
able. The jumpers listed in Table 24 allow the user to select the voltage (V
CCIO
) applied to the adjustable banks.
Note that if the LatticeECP2 will be configured from the SPI Serial Flash, bank 8 must be set to 3.3V (because SPI
Serial Flash is 3.3V). Also, if the board is plugged into a PCI/PCI-X connector, bank 6 must be set to 3.3V (because
the PCI clock is routed to bank 6 on this board).
Table 24. Bank Voltage Selection
The following tables detail the various I/O standards supported by the LatticeECP2 sysIO™ structures. More infor-
mation can be found in Lattice technical note TN1102,
LatticeECP2 sysIO Usage Guide,
available on the Lattice
web site at www.latticesemi.com.
Table 25. Mixed Voltage I/O Support
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
thresholds will be correct, assuming the user has also selected the desired input level using ispLEVER
®
software.
Output levels are tied directly to V
CCIO.
Location
Position
Function
Default
J29
1 to 2
Connects 3.3V to VCCAUX
X
Bank
Function
Jumper
Settings
0
I/O
—
3.3V Only
1
I/O
—
3.3V Only
2
I/O
J37
1 - 2 = 3.3V
3 - 4 = ADJ
5 - 6 = 1.2V
3
I/O
—
3.3V Only
4
I/O
—
3.3V Only
5
I/O
—
3.3V Only
6
I/O
J18
1 - 2 = 3.3V
3 - 4 = ADJ
5 - 6 = 1.2V
7
I/O
J17
1 - 2 = 3.3V
3 - 4 = ADJ
5 - 6 = 1.2V
8
sysCONFIG
J39
1 - 2 = 3.3V
3 - 4 = ADJ
5 - 6 = 1.2V
V
CCJ
ispJTAG™
—
3.3V Only
J17, 18, 37, and 39 must have no more than one jumper installed.
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