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ST92195D Datasheet(PDF) 156 Page - STMicroelectronics

Part # ST92195D
Description  48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER
PDF  249 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92195D Datasheet(HTML) 156 Page - STMicroelectronics

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ST92195C/D - TELETEXT SLICER AND ACQUISITION UNIT
TELETEXT SLICER AND ACQUISITION UNIT (Cont’d)
7.7.5.2 Hamming 8/4 Decoding
!bi is bi complemented.
Equation Number
Equation
(⊕ = xor)
A
= b7 ⊕ b5 ⊕ b1 ⊕ b0
B
= b7 ⊕ b3 ⊕ b2 ⊕ b1
C
= b5 ⊕ b4 ⊕ b3 ⊕ b1
D
= b7 ⊕ b6 ⊕ b5 ⊕ b4 ⊕ b3 ⊕ b2 ⊕ b1 ⊕ b0
A
B
C
D
Interpretation
Handling
23
22
21
20
ERR bit
00
00
b1 erroneous
corrected
b7
b5
b3
!b1
0
00
10
b7 erroneous
corrected
! b7
b5
b3
b1
0
01
00
b5 erroneous
corrected
b7
! b5
b3
b1
0
01
10
b0 erroneous
accepted
b7
b5
b3
b1
0
10
00
b3 erroneous
corrected
b7
b5
! b3
b1
0
10
10
b2 erroneous
accepted
b7
b5
b3
b1
0
11
00
b4 erroneous
accepted
b7
b5
b3
b1
0
11
10
b6 erroneous
accepted
b7
b5
b3
b1
0
1
1
1
1
no error
accepted
b7
b5
b3
b1
0
other cases
1
more than 1 error
rejected
1



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