Data Sheet

Ethernet Controller I210 —Flash Map
200
6.2.22 Functions Control (Word 0x21)
Bit Name
Default HW
Mode
Description
15:12 Reserved 0x0 Reserved.
11 NC-SI ARB Enable 0b
NC-SI Hardware Arbitration Enable
0b = NCSI_ARB_IN and NCSI_ARB_OUT pads are not used. NCSI_ARB_IN is
pulled up internally to provide stable input.
1b = NCSI_ARB_IN and NCSI_ARB_OUT pads are used.
10 BAR32 1b
Bit (loaded to the BARCTRL register) preserves the legacy 32-bit BAR mode when
BAR32 is set. When cleared to 0b, 64-bit BAR addressing mode is selected.
Note: If PREFBAR is set, the BAR32 bit should always be 0b (64-bit BAR
addressing mode).
Refer to Section 9.3.11.
9PREFBAR 0b
0b = BARs are marked as non prefetchable.
1b = BARs are marked as prefetchable.
Refer to Section 9.3.11.
Notes:
1. The I210 implements non-prefetchable space in memory BAR, since it has
read side affects. This bit is loaded from the PREFBAR bit in the Flash.
2. If PREFBAR bit is set then the BAR32 bit should be 0b.
8drop_os2bmc1b
0b = Do not drop OS2BMC packets when the management buffer is not available.
1b = Drop OS2BMC packets when the management buffer is not available.
Note: Clearing this bit avoids the loss of OS2BMC traffic but might cause head of
line blocking on traffic to network.
7:3 Reserved 0b Reserved.
2drop_bmc2os1b
0b = Do not drop BMC2OS packets when no Rx descriptors are available.
1b = Drop BMC2OS packets when no Rx descriptors are available.
1:0 Reserved 0x0 Reserved.