HD-15530 Datasheet, PDF (5/12 Pages) Intersil Corporation – CMOS Manchester Encoder-Decoder

HD-15530
How to Make Our MTU Look Like a Manchester Encoded UART
VALID WORD
DECODER
ENCODER CLK
BIPOLAR
ZERO IN
BIPOLAR
ONE IN
UNIPOLAR
DATA IN
COMMAND
SYNC
DECODER
RESET
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
V_CC
SYNC
SELECT
ENCODER
ENABLE
BIPOLAR
ONE OUT
INHIBIT
OUTPUT
BIPOLAR
ZERO OUT
MASTER
RESET
A B CK H A B CK
74LS164
74LS164
PARALLEL OUT
FIGURE 3.
O_H SH/LD CK SI O_H SH/LD CK
74165
74165
PARALLEL IN
Typical Timing Diagrams for a Manchester Encoded UART
ENCODER ENABLE
SYNC SELECT
VALID
PARALLEL IN
BIPOLAR ONE OUT
P
BIPOLAR ZERO OUT
SYNC
MSB
P
LSB PARITY
FIGURE 4. ENCODER TIMING
VALID
BIPOLAR ONE IN
SYNC
BIPOLAR ZERO IN
COMMAND SYNC
PARALLEL OUT
VALID
VALID WORD
FROM
PREVIOUS
RECEPTION
MSB
LSB PARITY
P
P
FIGURE 5. DECODER TIMING
5-146
VALID