Data Sheet

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Ethernet Controller I210 —Interconnects

3.4 iNVM

The I210 can operate with no Flash attached (Flash-less mode). The I210 incorporates an on-die

internal NVM (iNVM) memory (size 2 Kb) that enables designers to internally program the I210 with a

subset of the default values that are normally associated with an external Flash. iNVM is similar to One

Time Programmable (OTP) memory except that it allows for a limited number of modifications and

corrections after initial programming. The iNVM has a capacity of 64 words, or 32 two-word CSR

entries. A word, once used, cannot be rewritten. The initial programming will take a number of these,

and each new entry takes additional words until the capacity is reached. For example, programming the

MAC address consumes three auto-load word structures.

The last two words of the iNVM (62-63) are used for manufacturing identification information. Word 61

is written with version information when the iNVM is programmed using Intel tools. The contents of

these words do not affect the operation of the device.

Refer to the note in Section 1.4.3 for the functional limitation that exists when the I210 operates

without an external Flash part.

This section describes the iNVM structure for the I210.

3.4.1 iNVM Contents

The iNVM memory is used there to store and program the default values that are otherwise

programmed via auto-load from the external Flash memory. The list of programmable values includes

the following (amongst others):

• MAC address - words 0x00, 0x01, 0x02

PCIe Init Configuration 3 0x1A 7 Y Y

PCIe Control 1 0x1B 8 Y Y

LEDCTL 1 Default LAN 0x1C 24 Y Y

Device Rev ID 0x1E 14 Y Y

LEDCTL 0 Default LAN 0x1F 25 Y Y

Software Defined Pins Control -

LAN

0x20 32 Y Y Y

Functions Control 0x21 13 Y Y

LAN Power Consumption 0x22 22 Y Y

PCIe Reset Configuration Pointer

and PCIe Reset CSR Auto

Configuration Structures - LAN

0x23 26 Y Y

Init Control 3 LAN 0x24 23 Y Y

CSR Auto Configuration Power-Up

LAN

0x27 3 Y

PCIe Control 2 0x28 9 Y Y

PCIe Control 3 0x29 10 Y Y

Watchdog Configuration 0x2E 34 Y Y Y

1. After asserting CTRL.DEV_RST by software partial load of parameters relevant to the port is done. Assertion of

CTRL_EXT.EE_RST causes load of port parameters similar to CTRL.RST.

2. Loaded only if load subsystem ID bit is set.

Table 3-18. Shadow RAM Auto-Load Sequence

Flash Word Name

Flash Word

Address

Order

Full Load

(Power-up)

Full Load

No MGMT

(PCI RST)

Software

Reset Port

Load