Byte Array agent

The main task of this agent is to generate field of bytes which can be sent to DUT through the lower level agent. This agents does not contains a driver because it is higher level agent. Agent is used for connecting of all components (driver, monitor,…). Agent has his own configuration object which contains one parameter active (when is up then agent is active in other way is passive). When agent is active then sequencer is created. When is passive then only monitor is created.

Byte Array sequence item

Sequence item contains only one randomizable item.

• byte unsigned data[] sequence_item randomizable variable

• do_copy is used for copying of the transaction.

• do_compare is used for comparing data of two transactions.

• convert2string is used for printing whole transaction.

Byte Array monitor

Byte Array monitor is base class used for monitoring of traffic. This is only simple monitor which creates analysis port and sequence item and must be subclassed to particular lower level interface.

See the byte_array_mfb environment for example of Byte Array to MFB conversion.

Byte 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 setting which set a boundary for randomization. The following table shows a simplified description of those sequences. The description describes properties of byte array in transactions.

Sequence	Description
sequence_simple	size of byte array is randomly distributed by uniform distribution
sequence_simple_const	size of byte array is same for all transactions in sequence
sequence_simple_gauss	size of byte array is randomly distributed by normal distribution
sequence_simple_inc	size of byte array is increasing in every generated transactions
sequence_simple_dec	size of byte array is decreasing in every generated transactions

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

Sequence configuration

Configuration object config_sequence contain one 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);