DP83821 datasheet(45/86 Pages) NSC

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4.0 Register Set (Continued)

4.2.4 EEPROM Map

Registers for SOPAS[47:0] and PMATCH[47:0] can be accessed directly via the combination of the RFCR (offset 0048h)

and RFDR (offset 004Ch) registers as well as loaded from the EEPROM as noted here.

The lower 8 bits of the checksum value should be 55h. For the upper 8 bits, add the top 8 data bits to the lower 8 data

bits for each address. Sum the resultant 8 bit values for all addresses and then add 55h. Take the 2’s complement of the

final sum. This 2’s complement number should be the upper 8 bits of the checksum value in the last address.

As an example, consider an EEPROM with two addresses. EEPROM address 0000h contains the data 1234h. EEPROM

address 0001h contains the data 5678h.

12h + 34h = 46h

56h + 78h = CEh

46h + CEh + 55h = 69h

The 2’s complement of 69h is 97h so the checksum value entered into EEPROM address 0002h would be 9755h.

EEPROM

Address

Configuration/Operation Register Bits

Default Value

(16 bits)

0000h

CFGSID[31:16]

0000h

0001h

CFGSID[15:0]

0000h

0002h

CFGINT[31:16]

340Bh

0003h

4’h0,

3’h0, CFGCS[20],

2’h0, PMCAP[31], PMCAP[21],

3’h0, PMCSR[8]

0020h

0004h

6’h00, GPIOR[9:0]

0000h

0005h

6’h00, CFG[24:21], CFG[16:15], 3’h0, CFG[1]

0000h

0006h

CR[2], WCSR[10:9], WCSR[4:0],

1’h0, RFCR[31:27], RFCR[22], RFCR[19]

0000h

0007h

SOPAS[47:32]

0000h

0008h

SOPAS[31:16]

0000h

0009h

SOPAS[15:0]

0000h

000Ah

PMATCH[47:32]

0000h

000Bh

PMATCH[31:16]

0000h

000Ch

PMATCH[15:0]

0000h

000Dh

checksum value

N/A

DP83821 Datasheet(PDF) 45 Page - National Semiconductor (TI)

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