![background image](http://html1.mh-extra.com/html/national-semiconductor/dp83816avng/dp83816avng_manual_710451043.webp)
42
www.national.com
4.0 Register Set
(Continued)
DP83816
4.2.3 EEPROM Access Register
The EEPROM Access Register provides an interface for software access to the NMC9306 style EEPROM The default
values given assume that the EEDO line has a pullup resistor to VDD.
4.2.4 EEPROM Map
In the above table:
N denotes the value is dependent on the ethernet MAC ID Number.
X denotes the value is dependent on the checksum value.
Tag:
MEAR
Size:
32 bits
Hard Reset:
00000002h
Offset:
0008h
Access:
Read Write
Soft Reset:
00000002h
Bit
Bit Name
Description
31-7
unused
6
MDC
MII Management Clock
Controls the value of the MDC pin. When set, the MDC pin is 1; when clear the MDC pin is 0. R/W
5
MDDIR
MII Management Direction
Controls the direction of the MDIO pin. When set, DP83816 drives the MDIO pin. When clear MDIO bit
reflects the current state of the MDIO pin. R/W
4
MDIO
MII Management Data
Software access to the MDIO pin (see MDDIR above). R/W
3
EESEL
EEPROM Chip Select
Controls the value of the EESEL pin. When set, the EESEL pin is 1; when clear the EESEL pin is 0. R/W
2
EECLK
EEPROM Serial Clock
Controls the value of the EECLK pin. When set, the EECLK pin is 1; when clear the EECLK pin is 0. R/W
1
EEDO
EEPROM Data Out
Returns the current state of the EEDO pin. When set, the EEDO pin is 1; when clear the EEDO pin is 0.
RO
0
EEDI
EEPROM Data In
Controls the value of the EEDI pin. R/W
EEPROM
Address
Configuration/Operation Register Bits
Default Value
(16 bits)
0000h
CFGSID[0:15]
D008h
0001h
CFGSID[16:31]
0400h
0002h
CFGINT[24:31],CFGINT[16:23]
2CD0h
0003h
CFGCS[20],PMCAP[31],PMCAP[21],PMCSR[8],
CFG[13:16],CFG[18:23],CR[2], SOPAS[0]
CF82h
0004h
SOPAS[1:16]
0000h
0005h
SOPAS[17:32]
0000h
0006h
SOPAS[33:47],PMATCH[0]
000Nh
0007h
PMATCH[1:16]
NNNNh
0008h
PMATCH[17:32]
NNNNh
0009h
PMATCH[33:47],WCSR[0]
NNNNh
000Ah
WCSR[1:4],WCSR[9:10],RFCR[20],RFCR[22],
RFCR[27:31],000b (3 bits)
A098h
000Bh
checksum value
XX55
Summary of Contents for DP83816AVNG
Page 106: ...105 www national com DP83816 Notes...