AM8530H AMD [Advanced Micro Devices], AM8530H Datasheet - Page 62

• Manufacturer Part Number: AM8530H
• Description: Serial Communications Controller
• Manufacturer: AMD [Advanced Micro Devices]

AMD
The serial data stream sent by the transmitter for the six bits/character with parity case is
shown below in Figure 4–9. All the unused bits are ignored by the transmit logic except in
the case of five bits per character.
4–10
20-Bit Transmit
WR7 Sync
Register
D7
1
1
1
1
0
Zero Insert
Generator
Internal Data Bus
(5 Bits)
CRC
D6
1
1
1
0
0
CRC-SDLC
D0
WR6 Sync
Register
D5
Table 4–1. Data Format—Five Bits or Less
1
1
0
0
0
Figure 4–9. Six Bits/Character with Parity
Shift Register
P
Figure 4–8. SCC Transmitter
ASYNC
D4
D4
1
0
0
0
SYNC
SDLC
Data Flow
D5
Data Communication Modes Functional Description
D4
D3
D3
D3
Transmit Data
Transmit MUX
0
0
0
& 2-Bit Delay
Transmit
Clock
Start Bit
D3
D2
D2
D2
D2
0
0
D2
Internal TxD
D1
D1
D1
D1
D1
0
D1
D0
D0
D0
D0
D0
D0
D0
Tx MUX
Encode
NRZI
Final
P
Transmitted
2 bits
3 bits
4 bits
5 bits
Bits
1 bit
To Other Channel
TxD