Filter
Top Products
PHY Registers — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 319
14.3.8.12 Extended Status Register - ESTATUS (15d; R)
14.3.8.13 Port Configuration Register - PCONF (16d; R/W)
Field Bit(s) Description Mode Default
Reserved 11:0 Reserved. Always read as 0b. RO 0b
1000BASE-T Half Duplex 12 1b = 1000BASE-T half duplex capable.
0b = not 1000BASE-T half duplex capable.
RO 1b
1000BASE-T Full Duplex 13 1b = 1000BASE-T full duplex capable.
0b = Not 1000BASE-T full duplex capable.
RO 1b
1000BASE-X Half
Duplex
14 1b =1000BASE-X half duplex capable.
0b = Not 1000BASE-X half duplex capable.
RO 0b
1000BASE-X Full Duplex 15 1b =1000BASE-X full duplex capable.
0b = Not 1000BASE-X full duplex capable.
RO 0b
Field Bit(s) Description Mode Default
Reserved 0 Always read as 0b. Write to 0b for normal operation. R/W 0b
Alternate NP Feature 1 1b = Enable alternate Auto-Negotiate next page feature.
0b = Disable alternate Auto-Negotiate next page feature.
R/W 0b
Reserved 3:2 Always read as 0b. Write to 0b for normal operation. R/W 0b
Auto MDIX Parallel
Detect Bypass
4 Auto_MDIX Parallel Detect Bypass. Bypasses the fix to IEEE
auto-MDIX algorithm for the case where the PHY is in forced-
speed mode and the link partner is auto-negotiating.
1b = Strict 802.3 Auto-MDIX algorithm.
0b = Auto-MDIX algorithm handles Auto-Negotiation disabled
modes. This is accomplished by lengthening the auto-MDIX
switch timer before attempting to swap pairs on the first time
out.
R/W 0b
PRE_EN 5 Preamble Enable
0b = Set RX_DV high coincident with SFD.
1b = Set RX_DV high and RXD = preamble (after CRS is
asserted).
R/W 1b
Reserved 6 Always read as 0b. Write to 0b for normal operation. R/W 0b
Smart Speed 7 1b = Smart Speed selection enabled.
0b = Smart Speed selection disabled.
Note: The default of this bit is determined by the EEPROM
speed bit (word 21h, bit 5).
R/W 0b
TP Loopback (10BASE-
T)
8 1b = Disable TP loopback during half-duplex operation.
0b = Normal operation.
R/W 1b
Reserved 9 Always read as 0b. Write to 0b for normal operation. R/W 0b
Jabber (10BASE-T) 10 1b = Disable jabber.
0b = Enable jabber.
R/W 0b
Bypass 4B5B (100BASE-
TX)
11 1b = Bypass4B5B encoder and decoder.
0b = Normal operation.
R/W 0b
Bypass Scramble
(100BASE-TX)
12 1b = Bypass scrambler and descrambler.
0b = Normal operation.
R/W 0b