HD-15531_02 Datasheet, PDF (8/16 Pages) Intersil Corporation – CMOS Manchester Encoder-Decoder

HD-15531
VALID WORD
TAKE DATA
SYNC DATA
SYNC DATA
SELECT
SYNC
CLOCK
DECODER
CLOCK
SYNC CLOCK
SELECT
BIPOLAR
ZERO IN
BIPOLAR
ONE IN
UNIPOLAR
DATA IN
TRANSITION
SELECT
COMMAND
SYNC
DECODER
PARITY SELECT
COUNT C₀
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
NC 16
17
18
19
20
A B CK H
74164
A B CK
74164
PARALLEL OUT
40
39
38
37
36
35 NC
34
33
32
31
30
29
28
27
26
25
24
23
22
21
O_H SH/LD CK SI O_H SH/LD CK SI
74165
74165
PARALLEL IN
V_CC
COUNT C₁
COUNT C₄
DATA SYNC
COUNT C₃
ENCODER
PARITY SEL.
SYNC
SELECT
ENCODER
ENABLE
BIPOLAR
ONE OUT
INHIBIT
OUTPUT
BIPOLAR
ZERO OUT
COUNT C₂
MASTER
RESET
FIGURE 3. HOW TO MAKE OUR MTU LOOK LIKE A MANCHESTER ENCODED UART
Typical Timing Diagrams for a Manchester Encoded UART
ENCODER ENABLE
SYNC SELECT
PARALLEL IN
BIPOLAR ONE OUT
BIPOLAR ZERO OUT
VALID
SYNC
P
MSB
P
LSB PARITY
FIGURE 4. ENCODER TIMING
VALID
8