13
LatticeXP2 Standard
Lattice Semiconductor
Evaluation Board User’s Guide
Compact Flash Connector
Connector J14 provides the evaluation board with the ability to interface to 3.3V Type II Compact Flash devices.
The FPGA can be programmed to use the various different Compact Flash protocols.
Mixed Signal Support
The LatticeXP2 Standard Evaluation Board also provides access to some mixed signal interface chips. There are
four primary components dedicated to performing mixed signal functions on the evaluation board. These compo-
nents are:
• 12-bit Analog to Digital Converter
• 12-bit Digital to Analog Converter
• 128-position Digital Potentiometer
• 25K ohm Discrete Potentiometer
The mixed signal devices are all powered from the 3.3V supply. The digital power for these devices comes directly
from the 3.3V plane layer. The analog power is supplied via a smaller independent 3.3V plane. The independent
plane is supplied from the 3.3V digital plane, but it is filtered with a ferrite bead.
Analog to Digital Converter
The board includes a Burr Brown ADS7842 4 Channel Parallel Sampling Analog to Digital converter.
Table 14. Compact Flash Pin Assignments
Connector Pin
LatticeXP2 I/O
Connector Pin
LatticeXP2 I/O
CF0
B12
CF23
D6
CF1
A12
CF24
C6
CF2
A11
CF25
A5
CF3
B11
CF26
C5
CF4
D11
CF27
A4
CF5
C11
CF28
C4
CF6
A10
CF29
A3
CF7
B10
CF30
B3
CF8
E10
CF31
B2
CF9
A9
CF32
B1
CF10
B9
CF33
C3
CF11
D9
CF34
C2
CF12
C9
CF35
C1
CF13
A8
CF36
D4
CF14
B8
CF37
D3
CF15
D8
CF38
D1
CF16
C8
CF39
E1
CF17
A7
CF40
F2
CF18
B7
CF41
F1
CF19
F7
CF42
G2
CF20
C7
CF43
G1
CF21
A6
CF44
H2
CF22
B6
CF45
H1
