Sigma DE2-70 manual Block diagram of the clock distribution

DE2-70 User Manual

GPIO_0 GPIO_1

SMA

Connector

50-MHz	4
Oscillator

28-MHz	TV
Oscillator	decoder 1

TV

decoder 2

2	2
2	2

Cyclone II

FPGA

4

2

SD Card

AUDIO CODEC

PS/2

Ethernet

VGA

DAC

SDRAM

1

SDRAM

2

SSRAM

FLASH

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.

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