Memory Controller Read-Back for FPGA Instruction Verification
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Solution Overview
Problem
Conventional memory devices face challenges in verifying and debugging instruction data stored in on-chip memory, particularly in programmable logic devices like FPGAs, due to difficulties in reading back and validating instruction contents efficiently, leading to potential corruption and functional issues.
Innovation Solution
A circuit and method that utilize a memory controller with bidirectional buses to write and read instruction data, enabling the read-back of instruction data from memory, allowing for validation and integration with software debugging tools, thereby facilitating accurate data verification and debugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional memory devices use traditional instruction fetch mechanisms, then instructions can be loaded into memory, but the ability to read back and verify instruction contents is limited or non-existent
Solution Approach 1:
The memory controller is designed to handle multiple types of operations through a unified interface. The same controller that manages instruction fetch operations also manages read-back operations for verification and debugging. This multi-functionality allows the system to verify instruction contents without adding separate dedicated hardware for reading back instructions, thus improving reliability while controlling complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism between the memory and the verification system. The memory controller acts as this intermediary, facilitating the read-back of instruction contents to external verification systems or debugging tools. This intermediary approach enables verification capabilities without requiring direct access paths that would significantly increase device complexity.
2Ease of operation
If soft FPGA IP based techniques are used to read memory contents, then instruction data can be accessed, but performance decreases and area overhead increases
Solution Approach 1:
The memory controller is designed to serve the verification and debugging needs of the system itself. By incorporating read-back functionality directly into the memory controller, the system can perform self-verification of instruction contents without relying on external soft FPGA IP cores. This self-service approach eliminates the performance penalties and area overheads associated with using soft IP-based solutions while maintaining ease of software debugging.
3Reliability
If bitstream read back mechanism is used, then instruction data can be read from memory, but it cannot be used with software debugging tools
Solution Approach 1:
The memory controller is designed with universal functionality that supports both hardware-based bitstream read-back mechanisms and software-based debugging operations. The same controller interface and control logic can facilitate read-back operations for validation purposes as well as integration with software debugging tools, thereby achieving both reliability in instruction data validation and adaptability with different debugging methodologies.
Data Source
AI summary
According to one embodiment of the invention, a method of accessing instruction data from a memory comprises steps of specifying a predetermined address of a memory for storing instruction data; writing instruction data to the predetermined address in the memory; reading the instruction data from the predetermined address after the step of writing instruction data; and determining whether the instruction data is valid. According to another embodiment of the invention, a method describes a method of accessing instruction data from a memory by way of first and second data buses. According to a further embodiment, instruction data read back from the memory is multiplexed to a memory controller. A circuit for accessing instruction data written to a memory is also described.