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Processor Integrated I/O (IIO) Configuration Registers LN[0:3]EQ Bus: 0 Bus: 0 Bus: 0 3.2.6.2 Device: 1 Device: 2 Device: 3 Function: 0–1 Function: 0–3 Function: 0–3 Offset: 25Ch, 25Eh, 260h, 262h Offset: 25Ch, 25Eh, 260h, 262h Offset: 25Ch, 25Eh, 260h, 262h Bit Attr Reset Value 7 RV 0h Reserved 6:4 RO 7h Upstream Component Receiver Preset Hint Receiver Preset Hint for Upstream Component. The upstream component uses this hint for receiver equalization. The Root Ports are upstream components. The encodings are defined below. 000b = -6 dB 001b = -7 dB 010b = -8 dB 011b = -9 dB 100b = -10 dB 101b = -11 dB 110b = -12 dB 111b = reserved Description 3 RV 0h Reserved 2:0 RW-O 2h Upstream Component Transmitter Preset Transmitter Preset for an Upstream Component. The Root Ports are upstream components. The encodings are defined below. 000b = -6 dB for de-emphasis, 0 dB for preshoot 001b = -3.5 dB for de-emphasis, 0 dB for preshoot 010b = -6 dB for de-emphasis, -3.5 dB for preshoot 011b = -3.5 dB for de-emphasis, -3.5 dB for preshoot 100b = -0 dB for de-emphasis, 0 dB for preshoot 101b = -0 dB for de-emphasis, -3.5 dB for preshoot others = reserved LN[4:7]EQ—Lane 4 through Lane 7 Equalization Control Register This register is unused when the link is configured at x4 in the bifurcation register. LN[4:7]EQ Bus: 0 Bus: 0 Bus: 0 122 Device: 1 Device: 2 Device: 3 Bit Attr Reset Value 15 RV 0h Reserved Function: 0 Function: 0, 2 Function: 0, 2 Offset: 264h, 266h, 268h, 26Ah Offset: 264h, 266h, 268h, 26Ah Offset: 264h, 266h, 268h, 26Ah Description 14:12 RW-O 2h Downstream Component Receiver Preset Hint Receiver Preset Hint for Downstream Component with the following encoding. The Upstream component must pass on this value in the EQ TS2’es. 000b = -6 dB 001b = -7 dB 010b = -8 dB 011b = -9 dB 100b = -10 dB 101b = -11 dB 110b = -12 dB 111b = Reserved For a Downstream Component, this field reflects the latest Receiver Preset value requested from the Upstream Component on Lane 0. The default value is 111b. 11 RV 0h Reserved Datasheet, Volume 2
