Data Sheet

Interconnects—Ethernet Controller I210

Figure 3-5. Flash Part Size is Smaller Than BAR Size

3.3.3.2 Management Controller (MC) Interface

The MC can issue NC-SI commands that require read/write access to some Flash and/or shadow RAM

words.

3.3.4 Flash Access Contention

The I210 firmware is constantly running from the Flash. Any read or write access to the Flash made by

software must be preceded by acquiring ownership over the Flash semaphore (refer to Section 4.6.1).

This is also useful to avoid the timeout of the PCIe transaction made to a memory mapped Flash

address while the Flash is currently busy with a long sector erase operation.

0x 000000

0x00 07 FF

0x00 0FFF

0x 00 08 00

Ph ysica l Flash

Word Address

FLASH

Free Pro vision ing

Area Seg ment

Shadow RAM

Ban ks

Secu red Area

for FW image

Ex pan sio n/ Option

ROM Mo d ule

Expansion-ROM

BAR

0x001000

Memory

BAR

4 KB

BAR Address 0x0

12 8KB

I f CSR_ SIZ E = 0b

BAR Address 0x20000

BAR Address 0x0

FLASH_SIZE – 1

FLASH_SIZE

FLASH_SIZE – 1

FL ASH_SIZ

BAR_SIZE

1MB – 8KB – 1