Logic Vector Array agent

The main task of this agent is to generate a field of logic vectors that can be sent to the DUT through a lower-level agent. This agent does not contain a driver because it is a higher-level agent. However, it connects all components like the driver, monitor, etc., together. It has its own configuration object which contains one parameter: active (the agent is active when it is set, else it is passive). When the agent is active, a sequencer is created. When it is passive, only a monitor is created.

Logic Vector Array sequence item

A sequence item contains only one randomizable item.

• logic[ITEM_WIDTH-1 : 0] data[] sequence_item randomizable variable

Function	Description
do_copy	Is used for copying of the transaction.
do_compare	Is used for comparing data of two transactions.
convert2string	Is used for printing the whole transaction.
convert2block	Is used for printing the whole transaction which is divided into blocks.

Logic Vector Array monitor

Logic Vector Array monitor is a basic class used to monitor traffic. This is only a simple monitor which creates an analysis port and a sequence item and must be subclassed to a particular lower-level interface.

See, for example, the logic_vector_array_mfb environment of Logic Vector Array to MFB conversion.

Logic Vector Array Sequence

This package contains some interesting predefined sequences. Sequences generate N random transactions. The number of transactions is randomly selected when the sequence is randomized. Transactions contain a randomizable byte array. The major difference between the sequences is the boundary of the randomized size of a byte array. Every sequence has its own setting which sets a boundary for the randomization process. The following table shows a simplified description of these sequences. It describes the properties of byte arrays in transactions.

Sequence	Description
sequence_simple	the size of the byte array is randomly distributed by a uniform distribution,
sequence_simple_const	the size of the byte array is the same for all transactions in the sequence,
sequence_simple_gauss	the size of the byte array is randomly distributed by a normal distribution,
sequence_simple_inc	the size of the byte array is increased for every generated transaction,
sequence_simple_dec	the size of the byte array is decreased for every generated transaction

The last sequence is the sequence_lib, which picks N random sequences from the list above and runs them consecutively on the sequencer

Sequence configuration

The configuration object config_sequence contains a single configuration function.

Function	Type	Description
array_size_set(min, max)	[bytes]	Set minimum and maximum array size

sequence_lib seq;

seq = sequence_lib::type_id::create("seq");
seq.cfg = new();
//set maximum and minimum packet size
seq.cfg.array_size_set(64, 128);