Logic vector agent

The main task of this agent is to generate field of logic vector[ITEM_WIDTH-1:0] 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.

Logic Vector Array sequence item

Sequence item contains only one randomizable item.

• logic [ITEM_WIDTH-1:0] 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.

Logic Vector Array monitor

Logic vector 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 ligc_vector_array_mfb environment for example of ligic 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 logic_vector array. The major difference between the sequences is the boundary of the randomized size of a logic vector 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 logic vector array in transactions.

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