DE4 User Manual
135
www.terasic.com
June 20, 2018
Figure 5
–24 Display progress and result information for the DDR2 demonstration
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The External Clock Generator provides designers using the 3 programmable clock geneators via
Texas Instruments chips (CDCM61001RHBT x 2, CDCM61004RHBT) the ability to specify the
clock frequency individually, in addition addressing the input reference clock for the Stratix IV GX
transceivers. The programmable clock is controlled by a control bus connected to the MAX II
EPM2210 device. This can reduce the Stratix IV GX I/O usage while enabling greater functionality
on the FPGA device. The MAX II EPM2210 device is capable of storing the last entered clock
settings at which in the event the board restarts, the last known clock settings are fully restored. In
this demonstration, we illustrate how to utilize the clock generators IP to define the clock output
using the serial bus. The programmable clock output generates clock frequencies of 62.5, 75, 100,
125, 150, 156.25, 187.5, 200, 250, 312.5, and 625MHz for these clock signals:
SATA_REFCLK/PLL_CLKIN (CDC61004RHBT)
HSMA_REFCLK (CDCM61101/01)
HSMB_REFCLK (CDCM61101/02)
Clock signals SATA_REFCLK and PLL_CLKIN are derived from the same programmable clock
Summary of Contents for ALTERA DE4
Page 1: ...DE4 User Manual 1 www terasic com June 20 2018 ...
Page 54: ...DE4 User Manual 54 www terasic com June 20 2018 ...
Page 83: ...DE4 User Manual 83 www terasic com June 20 2018 Figure 3 8 Access DDR2 SO DIMM memory ...
Page 92: ...DE4 User Manual 92 www terasic com June 20 2018 Figure 3 17 Fan Control of the DE4 ...
Page 150: ...DE4 User Manual 150 www terasic com June 20 2018 Figure 5 35 SOPC builder ...