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Please refer to FX2LP Technical Reference Manual: https://www.cypress.com/file/126446/download
Details of all the registers are available under Chapter 15. Registers.
Also, you can refer to other chapters like Slave FIFO and General Programmable Interface for detailed explanation of their implementation.
Most of the helpful documents on FX2LP is listed in this KBA: Help Content for the CY3684 FX2LP DVK - KBA87890