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Avnet Electronics Marketing
14 of 33
Rev 1.0 04/17/2006
Released
Literature # ADS-005104
2.4 Clocks
The available clock sources on the Spartan-3 Development board are shown below. The following were brought in on global clock
inputs and are recommended for use as system clocks.
•
Single-ended, 66MHz Oscillator – FPGA pin “AD13”
•
Single-ended, 100MHz Oscillator – FPGA pin “A13”
•
Single-ended socket , 40MHz Oscillator – FPGA pin “AE14”
•
Single-ended SMA input – FPGA pin “AE13”
•
Single-ended header input – FPGA pin “AF14”
•
Differential, Optional Oscillator Pads (U14) – FPGA pins “C14” (P) and “B14” (N)
Freq
GCLK Input
FPGA pin#
Notes
66MHz YES AD13
100MHz YES
A13
40MHz typ.
YES
AE14
Socket
- YES
AE13
SMA
- YES
AF14
Header
125MHz typ.
YES
C14
B14
Not installed by default. 2.5V Diff Osc.
may be purchased separately.
Table 6 – Available GCLK Sources
There are clocks on the board which are included as reference for the Video DAC and Codec. These are 25.175MHz and 24.576MHz,
respectively. These were not brought in on GCLK inputs and are connected to the FPGA via bus switches. JP20 must be present in
order to use these clocks.
•
Single-ended, 25.175MHz Oscillator / Header_IO(24) – FPGA pin “W21”
•
Single-ended, 24.576MHz Oscillator / Header_IO(36) – FPGA pin “AE24”
Freq
GCLK Input
FPGA pin#
Notes
25.175MHz NO
W21 Use
W/VGA. Shared with Header.
24.576MHz
NO
AE24
Use W/Codec. Shared with Header
Table 7 – Available Non-GCLK Osc.
2.5 On Board Displays (2x20 LCD & 128x64 OLED)
2.5.1 2x20 Character LCD
Manufacturer: Optrex
Part #: DMC-20261NYJ-LY-BCE
Backlight En
JP14
2x20 Character Display
A
K
1
14
13
R110
Contrast
A 2x20 Character LCD is included with the Spartan-3 Development board. The displays LED backlight may be enabled using JP14.
Contrast may be adjusted using potentiometer “R110”. The display interface is either four or eight-bits wide, although our demos use
the 8-bit option.
For detailed information, please see:
www.optrex.com/SiteImages/LitCentral/Dmcman_full.pdf