Data Sheet

Ethernet Controller I210 — Programming Interface
576
8.27.3.32 1000BASE-T Pair Skew Register - Page 5, Register 20
9:8
jt_led_s[4]
Polarity
R/W 0x0 Retain
00b = On - drive jt_led_s[4] low, Off - drive jt_led_s[4] high.
01b = On - drive jt_led_s[4] high, Off - drive jt_led_s[4] low.
10b = On - drive jt_led_s[4] low, Off - tristate jt_led_s[4].
11b = On - drive jt_led_s[4] high, Off - tristate jt_led_s[4].
7:4
jt_led_s[5]
Control
R/W 0x7 Retain
If 19_3.3:2 is set to 11b then 19_3.7:4 has no effect.
0000b = On - receive, off - no receive.
0001b = On - link, blink - activity, off - no link.
0010b = On - link, blink - receive, off - no link.
0011b = On - activity, off - no activity.
0100b = Blink - activity, off -no activity.
0101b = On - transmit, off - no transmit.
0110b = On - full duplex, off - half duplex.
0111b = On - full duplex, blink - collision off - half duplex.
1000b = Force off.
1001b = Force on.
1010b = Force hi-Z.
1011b = Force blink.
11xxb = Reserved.
3:0
jt_led_s[4]
Control
R/W 0x3 Retain
0000b = On - receive, off - no receive.
0001b = On - link, blink - activity, off - no link.
0010b = On - link, blink - receive, off - no link.
0011b = On - activity, off - no activity.
0100b = Blink - activity, off -no activity.
0101b = On - transmit, off - no transmit.
0110b = On - full duplex, off - half duplex.
0111b = On - full duplex, blink - collision, off - half duplex.
1000b = Force off.
1001b = Force on.
1010b = Force hi-Z.
1011b = Force blink.
1100b = MODE 1 (dual LED mode).
1101b = MODE 2 (dual LED mode).
1110b = MODE 3 (dual LED mode).
1111b = MODE 4 (dual LED mode).
Bits Field Mode HW Rst SW Rst Description
15:12
Pair 7,8
(MDI[3]±)
RO 0x0 0x0
Skew = bit value x 8 ns. Value is correct to within ± 8 ns. The
contents of 20_5.15:0 are valid only if register 21_5.6 = 1b.
11:8
Pair 4,5
(MDI[2]±)
RO 0x0 0x0 Skew = bit value x 8 ns. Value is correct to within ± 8ns.
7:4
Pair 3,6
(MDI[1]±)
RO 0x0 0x0 Skew = bit value x 8 ns. Value is correct to within ± 8ns.
3:0
Pair 1,2
(MDI[0]±)
RO 0x0 0x0 Skew = bit value x 8 ns. Value is correct to within ± 8ns.