Altera ASI MegaCore Function Manual do Utilizador descarregar pdf (Página 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

Parallel

Data

FIFO

Buffer

Over-

sampler

Transceiver

GX-based devices only

Soft-logic transceiver implementations only

Transceiver

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