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DE2-70 User Manual
39
SMA
Connector
50-MHz
Oscillator
28-MHz
Oscillator
TV
decoder 1
TV
decoder 2
VGA
DAC
Ethernet
PS/2
AUDIO
CODEC
GPIO_0 GPIO_1
2
2
2
2
4
Cyclone II
FPGA
2
4
SDRAM
1
SDRAM
2
SSRAM
FLASH
SD Card
Figure 5.8. Block diagram of the clock distribution.
Signal Name FPGA Pin No. Description
CLK_28 PIN_E16 28 MHz clock input
CLK_50 PIN_AD15 50 MHz clock input
CLK_50_2 PIN_D16 50 MHz clock input
CLK_50_3 PIN_R28 50 MHz clock input
CLK_50_4 PIN_R3 50 MHz clock input
EXT_CLOCK PIN_R29 External (SMA) clock input
Table 5.5. Pin assignments for the clock inputs.