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doc/fpga_arm_notes.md
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# Table of Contents
- [Notes on ARM & FPGA communications](#notes-on-arm--fpga-communications)
- [Notes on ARM \& FPGA communications](#notes-on-arm--fpga-communications)
- [Table of Contents](#table-of-contents)
- [INTERFACE FROM THE ARM TO THE FPGA](#interface-from-the-arm-to-the-fpga)
- [FPGA](#fpga)
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The microcontroller (ARM) implements the transport layer. First it decodes the samples received from
the FPGA. These samples are stored in a Direct Memory Access (DMA) buffer. The samples are binary
sequences that represent whether the signal was high or low. The software on the ARM tries to decode
these samples. When the Proxmark is in sniffing mode this is done for both the Manchester and Modified
these samples. When the Proxmark3 is in sniffing mode this is done for both the Manchester and Modified
Miller at the same time. Whenever one of the decoding procedures returns a valid message, this message
is stored in another buffer (BigBuf) and both decoding procedures are set to an un-synced state. The
BigBuf is limited to the available memory on the ARM. The current firmware has 2 KB of memory