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222 Software Developer’s Manual
Register Descriptions
Note: The PHY registers are accessed indirectly through the MDI/O interface described in Section 8.2.
Category Offset Abbreviation Name R/W Page
Diagnostic 03418h TDFT Transmit Data FIFO Tail R/W 371
Diagnostic 03420h TDFHS Transmit Data FIFO Head Saved Register R/W 371
Diagnostic 03428h TDFTS Transmit Data FIFO Tail Saved Register R/W 372
Diagnostic 03430h TDFPC Transmit Data FIFO Packet Count R/W 372
Diagnostic
10000h-
1FFFCh
PBM Packet Buffer Memory (n) R/W 373
Category
MDI
Register
Abbreviation Name R/W Page
PHY 00d PCTRL PHY Control Register R/W 245
PHY 01d PSTATUS PHY Status Register R 248
PHY 02d PID PHY Identifier (LSB) R 250
PHY 03d EPID Extended PHY Identifier (MSB) R 250
PHY 04d ANA Auto-Negotiation Advertisement Register R/W 251
PHY 05d LPA Link Partner Ability Register (Base Page) R 255
PHY 06d ANE Auto-Negotiation Expansion Register R 258
PHY 07d NPT Next Page Transmit Register R/W 259
PHY 08d LPN Link Partner Next Page Register R 260
PHY 09d GCON 1000BASE-T Control Register R/W 261
PHY 10d GSTATUS 1000BASE-T Status Register R 262
PHY 15d EPSTATUS Extended PHY Status Register R 263
PHY 16d PSCON PHY Specific Control Register R/W 264
PHY 17d PSSTAT PHY Specific Status Register R 267
PHY 18d PINTE PHY Interrupt Enable R/W 270
PHY 19d PINTS PHY Interrupt Status R 272
PHY 20d
EPSCON1
EPSCON (82544GC/
EI)
Extended PHY Specific Control 1 R/W 275
PHY 21d PREC PHY Receive Error Counter R 277
PHY 23d
1
PGSTAT
PHY Global Status
SPEED_TEN_LED and LINK_ACT_LED
2
R 279
PHY 24d
1
PLED
PHY LED Control
SPEED_100_LED and
SPEED_1000_LED
2
R/W 280
PHY 26d EPSCON2
Extended PHY Specific Status (not
applicable to the 82540EP/EM or 82544GC/
EI)
R/W 281
PHY 27d
3
EPSSTAT Extended PHY Specific Status R/W 281
PHY 29d R30PS
Register 30 Page Select (not applicable to
the 82544GC/EI, 82541xx, or 82547GI/EI)
W 281
PHY 30d R30AW
Register 30 Access Window (not applicable
to the 82544GC/EI, 82541xx, or 82547GI/
EI)
R/W 282
PHY 31d PPAGE
Page Select (82541xx and 82547GI/EI
only)
R/W 283
1. Applicable to the 82544GC/EI, 82541xx, and 82547GI/EI only.
2. Applicable to the 82541xx, and 82547GI/EI only.
3. Applicable to the 82544GC/EI only.