Datasheet
DP83848C
www.national.com 39
Table 11. Register Table
Register Name Addr Tag Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Basic Mode Control Register
00h BMCR Reset Loop-
back
Speed
Selection
Auto-
Neg
Enable
Power
Down
Isolate Restart
Auto-
Neg
Duplex
Mode
Collision
Test
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Basic Mode Status Register
01h BMSR 100Base
-T4
100Base
-TX FDX
100Base
-TX HDX
10Base-
T
FDX
10Base-
T
HDX
Re-
served
Re-
served
Re-
served
Re-
served
MF Pre-
amble
Sup-
press
Auto-
Neg
Com-
plete
Remote
Fault
Auto-
Neg
Ability
Link
Status
Jabber
Detect
Extend-
ed Capa-
bility
PHY Identifier Register 1
02h PHYIDR
1
OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB OUI MSB
PHY Identifier Register 2
03h PHYIDR
2
OUI LSB OUI LSB OUI LSB OUI LSB OUI LSB OUI LSB VNDR_
MDL
VNDR_
MDL
VNDR_
MDL
VNDR_
MDL
VNDR_
MDL
VNDR_
MDL
MDL_
REV
MDL_
REV
MDL_
REV
MDL_
REV
Auto-Negotiation Advertisement Register
04h ANAR Next
Page Ind
Re-
served
Remote
Fault
Re-
served
ASM_DI
R
PAUSE T4 TX_FD TX 10_FD 10 Protocol
Selection
Protocol
Selection
Protocol
Selection
Protocol
Selection
Protocol
Selection
Auto-Negotiation Link Partner Ability Regis-
ter (Base Page)
05h ANLPAR Next
Page Ind
ACK Remote
Fault
Re-
served
ASM_DI
R
PAUSE T4 TX_FD TX 10_FD 10 Protocol
Selection
Protocol
Selection
Protocol
Selection
Protocol
Selection
Protocol
Selection
Auto-Negotiation Link Partner Ability Regis-
ter Next Page
05h AN-
LPARNP
Next
Page Ind
ACK Mes-
sage
Page
ACK2 Toggle Code Code Code Code Code Code Code Code Code Code Code
Auto-Negotiation Expansion Register
06h ANER Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
PDF LP_NP_
ABLE
NP_
ABLE
PAGE_
RX
LP_AN_
ABLE
Auto-Negotiation Next Page TX Register
07h ANNPTR Next
Page Ind
Re-
served
Mes-
sage
Page
ACK2 TOG_TX CODE CODE CODE CODE CODE CODE CODE CODE CODE CODE CODE
RESERVED
08-0fh Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
EXTENDED REGISTERS
PHY Status Register
10h PHYSTS Re-
served
MDI-X
mode
Rx Err
Latch
Polarity
Status
False
Carrier
Sense
Signal
Detect
De-
scram
Lock
Page
Receive
MII Inter-
rupt
Remote
Fault
Jabber
Detect
Auto-
Neg
Com-
plete
Loop-
back Sta-
tus
Duplex
Status
Speed
Status
Link
Status
MII Interrupt Control Register
11h MICR Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
TINT INTEN INT_OE
MII Interrupt Status and Misc. Control Reg-
ister
12h MISR Re-
served
ED_INT LINK_IN
T
SPD_IN
T
DUP_IN
T
ANC_IN
T
FHF_INT RHF_IN
T
Re-
served
UNMSK_
ED
UNMSK_
LINK
UNMSK_
JAB
UNMSK_
RF
UNMSK_
ANC
UNMSK_
FHF
UNMSK_
RHF
RESERVED
13h Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
False Carrier Sense Counter Register
14h FCSCR Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
FCSCNT FCSCNT FCSCNT FCSCNT FCSCNT FCSCNT FCSCNT FCSCNT
Receive Error Counter Register
15h RECR Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
Re-
served
RXER-
CNT
RXER-
CNT
RXER-
CNT
RXER-
CNT
RXER-
CNT
RXER-
CNT
RXER-
CNT
RXER-
CNT
PCS Sub-Layer Configuration and Status
Register
16h PCSR Re-
served
Re-
served
Re-
served
BYP_4B
5B
Re-
served
TQ_EN SD_FOR
CE_PMA
SD_
OPTION
DESC_T
IME
Re-
served
FORCE_
100_OK
Re-
served
Re-
served
NRZI_
BYPASS
SCRAM_
BYPASS
DE
SCRAM_
BYPASS