VNN Removal Control (VNNREMCTL) – Offset c70 - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

ID	Date	Version	Classification
834576	10/10/2024	001	Public

VNN Removal Control (VNNREMCTL) – Offset c70

This is the VNN Removal Control registers. Refer description for each individual field below for more details of the register functionality.

Bit Range	Default	Access	Field Name and Description
31	0h	RO	Receiver Eye Margin Error Tracking Mechanism Disable (REMETMD) When this bit is set MAC will not track Error count during Receiver Equalization (EQ Phase 2 - PDMI , EQ Phase 3 - PCIe). Preset/Coeff evaluation will be based on FOM returned by PHY alone. This bit must be configured before training to GEN3 data rate. Register Attribute Static
30:9	0h	RO	Reserved (Rsvd) Reserved
8	0h	RW	Function Disable VNN Removal (FDVNNRE) When assert, controller will assert vnnremoval_en_b to SOC when link is function disable, so that VNN is allow to be remove when platform permitted.
7	0h	RW	Hot Plug VNN Removal Enable (HPVNNRE) When assert, controller will assert vnnremoval_en_b to SOC when clkreq_b deassetion in Detect state, so that VNN is allow to be remove when platform permitted.
6	0h	RW	Detect Not PCIe VNN Removal Enable (DNPVNNRE) When assert, controller will assert vnnremoval_en_b to SOC when link entering Detect Not PCIe when link is unown, so that VNN is allow to be remove when platform permitted.
5	0h	RW	RTD3 VNN Removal Enable (RTD3VNNRE) When assert, controller will assert vnnremoval_en_b to SOC when link entering L23 due to RTD3, so that VNN is allow to be remove when platform permitted.
4	0h	RW	Link Disable VNN Removal Enable (LDVNNRE) When assert, controller will assert vnnremoval_en_b to SOC when link entering Link Disable, so that VNN is allow to be remove when platform permitted.
3:2	0h	RW	Internal States Propagation Latency For VNN Removal Exit (ISPLFVNNRE) This register configure internal delay of IP to allow boundary lock to deassert. This counter will start count after contexts propagation is done and early boundary lock is deassert. 00 8 osc clocks 01 16 osc clocks 10 32 osc clocks 11 64 osc clocks Note: For each x4 instance, only the value from Port 1 is used. This is a per controller register
1:0	1h	RW	Link Reset Suppression Latency For VNN Removal Exit (LRSLFVNNRE) This register configure the Link Reset Suppression latency after pmc had deassert restore_b during VNN Removal, and link clock pll had achieved lock. Link reset will be suppress upon IP Inaccessible exit with restore_b assertion, and the counter will start count when restore_b deassert with link clock had achieved lock. After timer expire, link reset will be deassert. 00 4 osc clocks 01 8 osc clocks 10 16 osc clocks 11 32 osc clocks Note: For each x4 instance, only the value from Port 1 is used. This is a per controller register