Quartus® Prime Pro Edition User Guide: Platform Designer

ID 683609
Date 9/30/2024
Public
Document Table of Contents

6.8.2.1. Avalon® Packets to Transactions Converter IP Data Packet Formats

A response packet is returned for every write transaction. The IP also returns a response packet if a no transaction (0x7f) is received. An invalid transaction code is regarded as a no transaction. For read transactions, the IP returns the data read.

The Avalon® Packets to Transactions Converter IP expects incoming data streams to be in the formats shown in the table below.

Table 191.  Data Packet Formats

Byte

Field

Description

Transaction Packet Format

0

Transaction code

Type of transaction.

1

Reserved

Reserved for future use.

[3:2]

Size

Transaction size in bytes. For write transactions, the size indicates the size of the data field. For read transactions, the size indicates the total number of bytes to read.

[7:4]

Address

32-bit address for the transaction.

[n:8]

Data

Transaction data; data to be written for write transactions.

Response Packet Format

0

Transaction code

The transaction code with the most significant bit inversed.

1

Reserved

Reserved for future use.

[4:2]

Size

Total number of bytes read/written successfully.