Altera ASI MegaCore Function - Manual (Page 16)

January 2014 Altera Corporation Asynchronous Serial Interface (ASI) MegaCore Function User Guide
4. Functional Description
The ASI MegaCore function consists of the following elements:
■ Low voltage differential signalling (LVDS) inputs and outputs (I/Os) for the
receiver and transmitter
■ ASI transmitter
■ ASI receiver
■ Two PLLs for frequency multiplication—one for the transmitter, one for the
receiver
Transmitter
The transmitter comprises the following elements:
■ 8B10B encoder
■ Serializer
Figure 4–1 shows the ASI transmitter.
8B10B Encoder
The 8B10B encoder converts an 8-bit wide word to a 10-bit wide word. The complete
list of codes can be found in the DVB-ASI EN50083-9 standard.
A control code input inserts comma characters (K28.5) when no data is available at the
input of the encoder.
Transceiver
The transceiver can be either a serializer for soft-logic implementations, or GX
transceivers.
Figure 4–1. ASI Transmitter
8B10B
Encoder
LVDS I/O
Serial Data
Serializer
10
8
Parallel
Data
FIFO
Buffer
Over-
sampler
Transceiver
10
GX-based devices only
Soft-logic transceiver implementations only
Transceiver