12
LatticeXP2 Standard
Lattice Semiconductor
Evaluation Board User’s Guide
LCD Connector
Connector J13 is a 2x9 100mil center-center header designed to allow the use of LCD displays. The connector pro-
vides 5V directly from the DC input (J9). It also has adjustable backlight (R15) and contrast (R16) potentiometer
controls. The connector is designed for use with LCD displays such as the Lumex LCM-S02002DSF or LCM-
S02002DSR.
Note: Recent Lumex specifications show a 16-pin interface, which corresponds to pins 2-18 on the
J13 LCD Connector.
Table 11. LCD Connections
RS232 Interface
The evaluation board provides a RS232 connection for interfacing to equipment with RS232 ports. The RS232 con-
nector is a female DB9 connector, and can be found in the northeast corner of the board. Four 1x3 jumpers are
provided on the board to permit reconfiguration of the RX/TX/RTS/CTS connections.
Table 12. RS232 DB9 Pin Assignments
The LatticeXP2 FPGA is connected to the RS232 DB9 connector using a Max 3232 buffer chip. This buffer permits
the LatticeXP2 3.3V I/O pins to be interfaced to the 12V RS232 signaling standard. The LatticeXP2 I/O pins that
connect to the RS232 buffer listed in Table 13.
Table 13. LatticeXP2 to RS232 Pin Assignments
LCD Pin #
LCD Function
LatticeXP2 I/O
6
RS
U22
7
RW
Physical Connection
T21
Silkscreen Text
R22
8
E
T22
9
D0
Physical Connection
R22
Silkscreen Text
R20
10
D1
T20
11
D2
Physical Connection
R20
Silkscreen Text
P21
12
D3
R21
13
D4
Physical Connection
P21
Silkscreen Text
N22
14
D5
P22
15
D6
Physical Connection
N22
Silkscreen Text
—
16
D7
P20
RS232 Signal
Connector
Pin 1-2
Pin 2-3
RX
J18
J16-3
J16-2
TX
J17
J16-2
J16-3
CTS
J19
J16-7
J16-8
RTS
J22
J16-8
J16-7
RS232 Signal
LatticeXP2 I/O
RX
C21
TX
B22
CTS
B21
RTS
C22
