DE5-NET
User
Manual
79
June 20, 2018
Function Block Diagram
shows the function block diagram of the demonstration. The four QDRII+ SRAM
controllers are configured as a 72Mb controller. The QDRII+ SRAM IP generates a 550MHz clock
as memory clock and a half-rate system clock, 275MHz, for the controllers.
Figure 6-1 Function Block Diagram of the QDRII+ SRAM x4 Demonstration
In this demonstration, four QDRII+ SRAM controllers are sharing the FPGA resources (OCT, PLL,
and DLL), and the QDRII+ SRAM (B) is configured as the master to share the resource to the other
three slave QDRII+ SRAM (A/C/D).QDRII+ SRAM (A/C) share OCT, PLL, DLL from QDRII+
SRAM (B). QDII+ SRAM (D) shares OCT from QDRII+ SRAM (B) and it has its own PLL and
DLL resources. The Avalon bus read/write test
(RW_test)
modules
read and write the entire
memory space of each QDRII+ SRAM through the Avalon interface of each controller. In this
project, the RW_test module will first write the entire memory and then compare the read back data