HD3-15531B-9 INTERSIL [Intersil Corporation], HD3-15531B-9 Datasheet - Page 8

• Manufacturer Part Number: HD3-15531B-9
• Description: CMOS Manchester Encoder-Decoder
• Manufacturer: INTERSIL [Intersil Corporation]

Typical Timing Diagrams for a Manchester Encoded UART
BIPOLAR ZERO OUT
ENCODER ENABLE
BIPOLAR ONE OUT
PARITY SELECT
VALID WORD
SYNC CLOCK
TRANSITION
SYNC DATA
TAKE DATA
SYNC DATA
COMMAND
COUNT C
DECODER
UNIPOLAR
DECODER
BIPOLAR
BIPOLAR
SELECT
SELECT
ZERO IN
DATA IN
SELECT
CLOCK
CLOCK
ONE IN
SYNC
SYNC
SYNC SELECT
PARALLEL IN
0
FIGURE 3. HOW TO MAKE OUR MTU LOOK LIKE A MANCHESTER ENCODED UART
A B
74164
CK H
PARALLEL OUT
VALID
SYNC
A B
74164
MSB
CK
FIGURE 4. ENCODER TIMING
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
HD-15531
8
LSB
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
O
H
PARITY
NC
SH/LD
74165
P
P
CK
PARALLEL IN
SI
O
H
SH/LD CK
74165
SI
VALID
DATA SYNC
PARITY SEL.
COUNT C
COUNT C
COUNT C
ZERO OUT
COUNT C
ENCODER
ENCODER
ONE OUT
BIPOLAR
BIPOLAR
OUTPUT
MASTER
SELECT
ENABLE
INHIBIT
RESET
SYNC
V
CC
1
4
3
2