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Attached file's 5.4 section is "5.4 EZ-USB Memory Maps"
Please refer to page number 41.
To see how exactly the functions in EZ-USB.lib are implemented. You can check the source code in the .c files in the folder C:\Cypress\USB\CY3684_EZ-USB_FX2LP_DVK\1.0\Target\Lib\LP.
function can be found implemented in i2c.c.