Part IV. Behavioural Description Using VHDL
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1 Part IV Behavioural Description Using 4 Behavioural Description 5 Array attributes Type Signal attributes
2 Behavioural Style Behavioural style describes a design in terms of its behaviour, and not in terms of a netlist of components. We describe behaviour through if-then-else type of constructs, loops, sequential and concurrent assignment statements. Statements like if-then-else are inherently sequential. These must therefore occur only inside sequential bodies like processes. A concurrent assignment statement may be considered as a shorthand for a very simple process.
3 Specifying a waveform A waveform is described by a comma separated list of values and optionally, delays. For example, we may assign a waveform by a statement like indata <= 0, 1 AFTER 20 NS, 0 AFTER 50 NS; The values at different times are treated as transport delays and are all inserted in the time ordered queue without wiping out earlier values. (This is the only context where delays are transport by default). Single value assignments use inertial delay by default.
4 Concurrent Assignment A concurrent assignment can be made conditionally by using when clauses. name < = [delay-mechanism] waveform when Boolean-expression else waveform when Boolean-expression; The assignment is made from the first waveform where the Boolean expression evaluates to TRUE.
5 Concurrent Assignment The assignment can also be made on a selective basis, based on the value of some expression: with expression select name < = [delay-mechanism] waveform when choices, waveform when choices; If the expression evaluates to one of the specified choices, the corresponding assignment is made.
6 Assignment to an aggregate Assignments can be made to a collection of signals simultaneously. For example let vec be defined as bit vector(2 downto 0) vec <= ( 000 ) : string vec <= ( 0, 0, 1 ) : positional vec <= (1=> 1, others => 0 ) : named, partial vec <= ( 1, others => 0 ) : positional, partial vec <= (2 0 => 1, others => 0 ) : partial vec <= (others => 1 )
7 Sequential constructs need to be placed inside a process. A process uses the syntax: [ process-label: ] process [(sensitivity-list)] [is] [declarations] begin [sequential statements] end process [process-label]; Sequential statements include if constructs, case statements, looping constructs, assertions, wait statements etc.
8 Process with Sensitivity list Every process is like an endless loop. Therefore, it requires an explicit or implicit suspend statement. If a sensitivity list is given with the process statement, the process automatically suspends when it reaches its end. It restarts from the beginning when any of the signals in its sensitivity list has an event. This process has a static sensitivity and an implicit suspend statement.
9 Wait statements A process without a sensitivity list requires explicit suspend statements. These are provided by wait statements. These can be of the form: wait for waiting-time; wait on signal-list; wait until waiting-condition; wait for 0 some-time-unit; wait; wait for 0 ns causes the process to suspend till the next delta. The last form (bare wait statement) suspends the process for ever.
10 Dynamic sensitivity without a sensitivity list and multiple wait statements have a dynamic sensitivity. This is because these processes are sensitive to different events at different times. One cannot mix static and and dynamic sensitivity Thus, a process with a sensitivity list cannot use wait statements. This is because once the process is suspended, it is possible to have an event on a signal in the sensitivity list simultaneously with the condition for resumption after wait being fulfilled. This would leave the process undecided on where to resume from.
11 IF statements if statements are similar to their counterparts in programming languages. The syntax is: [ if-label: ] if Boolean-expression then sequential statements [ elsif Boolean-expression then sequential statements ] [ elsif... ] [ else sequential statements ] end if [ if-label ];
12 CASE statements A case statement acts like a multiplexer. The syntax is: [ case-label:] case expression is when choices = > sequential-statements [ when... ] end case [ case-label ];
13 CASE Choices Choices can be specified in CASE statements as vertical bar separated lists of expressions, discrete ranges or the keyword others. For example: case opcode is load store add subtract = >...
14 Loop Statements There are several different forms of the loop statement. The simplest is the endless loop: [ loop-label: ] loop [ loop-label: ] loop sequential statements end loop [ loop-label ]; This constitutes an endless loop. It is assumed that it will have an exit statement or a wait statement inside to suspend operation.
15 Exiting a Loop The exit statement has the syntax: [ label: ] exit [ loop-label ] [ when Boolean expression ] The loop label allows one to exit several levels of nested loops. We can also skip to the end of a loop by using the next statement. This works like continue in C.
16 NEXT Statement [ label: ] next [ loop-label ] [ when Boolean expression ] The next statement skips the statements of the loop and immediately starts the next iteration of the specified loop. The loop label allows one to skip through several levels of nested loops.
17 WHILE Loops also has a while loop. [ loop-label: ] while Boolean-expression loop sequential statements end loop [ loop-label ]; The loop continues as long as the Boolean expression is TRUE.
18 For Loops also provides a for loop. [ loop-label: ] for identifier in discrete-range loop sequential statements end loop [ loop-label ]; The discrete range can be of the form expression to downto expression The identifier is initialized to the left limit of the range and takes on successive values in the discrete range till it exceeds the right limit.
19 Assertions and Reports The assert statement takes the form [ label: ] assert Boolean expression [ report expression ] [ severity expression ]; If the Boolean expression is TRUE, no action is taken. If it is FALSE, an assertion violation is said to have occurred. The simulators then outputs the report expression. Subsequent operation depends on the severity clause.
20 Severity Clause in Assertions Assert statements are used for debugging and documentation. The severity clause decides what happens when an assertion failure occurs. Severity is an enumerated type which is predefined to take any of the values: note, warning, error, failure Depending on the severity value, simulation continues or is aborted.
21 Severity values Note is simply to generate an output when an assertion violation occurs. Warning is useful when the validity of the simulation may be in doubt, but we would like to issue a warning and continue anyway. Error is used when an unexpected value is encountered. Failure is the most severe violation and is used when some inconsistency is detected.
22 Assertions defaults [ label: ] assert Boolean expression [ report expression ] [ severity expression ]; If the optional report clause is missing in the assert statement, the default report message is Assertion Violation. If the severity clause is omitted, the default value is error. Most simulators allow the user to set a severity threshold, beyond which the simulation is aborted on an assertion violation. It is common to continue on note and warning and to abort on error and failure. In -93, the report clause can be used by itself as a statement to output useful messages.
23 Array attributes Type Signal attributes provides built in functions which return usefult attributes of the objects that they operate on. Attribute functions may provide attributes of Arrays Types Signals Entities are invoked as name attrib name. The single quote is read as tick
24 Array attributes Type Signal attributes Array Array attributes interrogate the property of arrays. Consider the declaration: TYPE regfile IS ARRAY(0 To 3, 7 Downto 0) OF BIT; Then we can use the following attributes: LEFT : regfile LEFT(2) = 7 RIGHT: regfile RIGHT(1) = 3 HIGH: regfile HIGH(2) = 7 LOW: regfile LOW(1) = 0 RANGE: regfile RANGE(1)= 0 TO 3 REVERSE RANGE: regfile REVERSE RANGE(1) = 3 DOWNTO 0 LENGTH: regfile LENGTH(1) = 4 ASCENDING: regfile ASCENDING(1) = TRUE
25 Array attributes Type Signal attributes Type Type attributes apply only to scalar types. Consider the declarations: TYPE nineval IS( U, X, 0, 1, Z, L, H, W, - ) SUBTYPE fourval IS nineval RANGE X to Z Then, fourval BASE = nineval LEFT, RIGHT, HIGH and LOW are defined for TYPES also. When applied to a TYPE, these return the corresponding values as defined for the type. For example, nineval LEFT = U, fourval LEFT = X POSITIVE LOW = 1
26 Array attributes Type Signal attributes Signal Name Example Return type Value type DELAYED s DELAYED Signal same as s STABLE s STABLE(5ns) Signal Boolean EVENT s EVENT Value Boolean QUIET s QUIET(3ns) Signal Boolean TRANSACTION s TRANSACTION Signal BIT DRIVING s DRIVING Value Boolean DRIVING VALUE s DRIVING VALUE Value same as s
27 Array attributes Type Signal attributes Case of RS Latch R S Q Entity RS Latch is Port(R,S: IN BIT; Q, Qbar: OUT BIT); End Entity RS Latch; Architecture trouble of RS Latch is Begin Q Q <= R NOR Qbar; Qbar <= S NOR Q; End Architecture trouble; This will run into trouble as Q and Qbar are declared to be outputs and cannot be used on the RHS expression of an assignment.
28 Array attributes Type Signal attributes RS Latch R Q S Q We have several choices: Declare Q and Qbar to be inout. This is not safe as this will allow outside circuitry to drive Q and Qbar nodes. Use structural description and connect nor outputs to internal signals s1 and s2. Later assign s1 and s2 to Q, Qbar. Introduces artificial delay in driving of Q and Qbar. Better choice is to use the driving value attribute.
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