2.12 External user memory
The MPS2 and MPS2+ FPGA Prototyping Boards provide external user ZBT SSRAM and PSRAM
memory.
The external user memory connects to the FPGA and consists of the following:
• Two 2MB 32-bit fast single-cycle ZBT SSRAM memories:
— Connect to two independent 32-bit memory interfaces on the FPGA.
• One 4MB 32-bit fast single-cycle ZBT SSRAM memory:
— Consists of two 2MB 32-bit memories which the board configures as one 64-bit memory. They
connect to one 64-bit memory interface on the FPGA.
• Two 16-bit 8MB PSRAM memory:
— Supplement the ZBT SSRAM.
Note
The 16MB PSRAM connects to the same 16-bit interface on the FPGA as the Ethernet MAC/PHY.
The MCC can pre-load the external user memory using the images.txt file before releasing reset,
enabling the MPS2 and MPS2+ to use the external memory as boot RAM.
The following diagram shows the external ZBT SSRAM user memory interface.
2 Hardware Description
2.12 External user memory
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