TPIC82000 Datasheet, PDF (24/92 Pages) Texas Instruments – Tire Pressure Monitoring System TX Module

TPIC82000 Series
SLDS189 – MAY 2012
www.ti.com
3.2.6.2 EEPROM Unit Structure and DATA/ECC Implementation
EEPROM is mapped on the ESFR space. It has a 43 words memory unit. Each unit has 7 bits (D6:D0).
The upper three bits (D6:D4) are allocated for Error Correcting Code (ECC) and the lower four bits
(D3:D0) are for data. The ECC contains Hamming codes. Hamming codes can detect up to two
simultaneous bit errors, and correct single-bit errors. The Hamming codes are calculated by the following
equations:
D4 = D2 XOR D1 XOR D0
D5 = D3 XOR D1 XOR D0
D6 = D3 XOR D2 XOR D0
ECC
One Word D6 D5 D4
DATA
D3 D2 D1 D0
Hamming Codes 1 1 1 7
0000 0
000 0
0001 1
100 4
0010 2
011 3
0011 3
010 2
0100 4
101 5
0101 5
001 1
0110 6
110 6
0111 7
001 1
1000 8
110 6
1001 9
010 2
1010 A
101 5
1011 B
100 4
1100 C
011 3
1101 D
111 7
1110 E
000 0
1111 F
24
FUNCTION DESCRIPTION
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