These bits set the protocol for reading data from the device.
000b = _1 : Legacy, SPI compatible protocols (SPI-xy-S-SDR); SPI compatible protocols with bus width options and SDR (SPI-xy-D-SDR and SPI-xy-Q-SDR) protocols.
001b = _2 : SPI compatible protocols with bus width options and DDR (SPI-x1-S-DDR, SPI-x1-D-DDR, SPI-x1-Q-DDR) protocols.
010b = _3 : Clock re-timer (CRT) protocols with SDR (CRT-S-SDR, CRT-D-SDR, CRT-Q-SDR).
011b = _4 : CRT protocols with DDR (CRT-S-DDR, CRT-D-DDR, CRT-Q-DDR).
100b = _5 : Parallel byte protocol. Writing 1xx enables parallel byte protocol.
101b = _6 : Parallel byte protocol. Writing 1xx enables parallel byte protocol.
110b = _7 : Parallel byte protocol. Writing 1xx enables parallel byte protocol.
111b = _8 : Parallel byte protocol. Writing 1xx enables parallel byte protocol.
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