DE5-NET
User
Manual
81
June 20, 2018
down, all the LEDs will be turned off. All LEDs should turn back on to indicate test passes
upon the release of BUTTON0.
If any LED is not lit up after releasing BUTTON0, it indicates the corresponding QDRII+
SRAM test has failed. 161H161H
lists the matchup for the four LEDs.
Press BUTTON0 again to regenerate the test control signals for a repeat test.
Table 6-1 LED Indicators
NAME
Description
LED0
QDRII+ SRAM(A) test result
LED1
QDRII+ SRAM(B) test result
LED2
QDRII+ SRAM(C) test result
LED3
QDRII+ SRAM(D) test result
6
6
.
.
2
2
D
D
D
D
R
R
3
3
S
S
D
D
R
R
A
A
M
M
T
T
e
e
s
s
t
t
This demonstration presents a memory test function on the two sodimm of DDR3-SDRAM on the
FPGA board. The memory size of each DDR3 SDRAM sodimm used in this test is 2 GB.
Function Block Diagram
shows the function block diagram of this demonstration. There are two DDR3 SDRAM
controllers. One is the master controller which shares resources with a slave controller. The shared
resources include delay-locked loops (DLLs), phase-locked loops (PLLs), and on-chip termination
(OCT). The controller uses 50 MHz as a reference clock, generates one 800.0 MHz clock as
memory clock, and generates one quarter-rate system clock 200.0 MHz for the controller itself.