Datasheet

Processor Integrated I/O (IIO) Configuration Registers
124 Datasheet, Volume 2
3.2.6.3 LN[8:15]EQ—Lane 8 though Lane 15 Equalization Control Register
This register is unused when the link is configured at x4 or x8 in the bifurcation
register.
LN[8:15]EQ
Bus: 0 Device: 2 Function: 0 Offset: 26Ch, 26Eh, 270h, 272h, 274h, 276h, 278h, 278h
Bus: 0 Device: 3 Function: 0 Offset: 26Ch, 26Eh, 270h, 272h, 274h, 276h, 278h, 278h
Bit Attr
Reset
Value
Description
15 RV 0h Reserved
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
10:8 RW-O 2h
Downstream Component Transmitter Preset
Transmitter Preset for Downstream Component with the following encoding. The
Upstream component must pass on this value in the EQ TS2’es.
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
For a Downstream Component, this field reflects the latest Transmitter Preset
requested from the Upstream Component on Lane 0. The default value is 111b.
7RV0hReserved
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
3RV0hReserved