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Software Developer’s Manual 277
Register Descriptions
13.4.7.1.23 Extended PHY Specific Control Register 2
EPSCON2 (26d; R/W)
NOTE: Not applicable to the 82540EP/EM, 82544GC/EI, 82541xx, or 82547GI/EI.
13.4.7.1.24 Extended PHY Specific Status Register (82544GC/EI Only)
EPSSTAT (27d; R)
13.4.7.1.25 MDI Register 30 Page Select
1
R30PS (29d; WO)
Table 13-47. Extended PHY Specific Control Register 2 Bit Description
Field Bit(s) Description Mode HW Rst SW Rst
Fiber Output
Amplitude
2:0
111b = 1.2, 100b = 0.9, 001b = 0.6
110b = 1.1, 011b = 0.8, 000b = 0.5
101b = 1.0, 010b = 0.7
R/W 100b Retain
Reserved 3 Reserved. Should be set to 1b. R/W 1b 1b
Reserved 4 Reserved. Should be set to 0b. R/W 0b 0b
Fiber Output
Impedance
5
1b= 75 ohm.
0b = 50 ohm.
R/W 0b Update
Fiber Input
Impedance
6
1b = 75 ohm.
0b = 50 ohm.
R/W 0b Update
Reserved 15:7 Reserved. Should be set to 0b. R/W 000h 000h
Table 13-48. Extended PHY Specific Status Bit Description
Field Bit(s) Description Mode HW Rst SW Rst
MODE[3:0] 27.3:0 MODE[3:0]. RO MODE[3:0] Retain
Reserved 27.15:4
Reserved. Should be set to
000000000000b.
RO 0b 0b
1. Not applicable to the 82544GC/EI, 82541xx, or 82547GI/EI.
Table 13-49. MDI Register 30 Page Select Bit Description
Field Bit(s) Description Mode HW Rst SW Rst
Register 30 Page
Select
15:0
Selects the register accessible via the
“window” at MDI register 30.
R/W 0000h 0000h