Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manual do Utilizador descarregar pdf (Página 511)

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101

VHDL AXI3 and AXI4 Monitor BFMs

VHDL Monitor API

Mentor VIP AE AXI3/4 User Guide, V10.2b

491

September 2013

AXI4 Assertion Configuration

By default, all built-in assertions are enabled in the monitor BFM. To globally disable them in

the monitor BFM, use the set_config() command as the following example illustrates:

set_config(AXI4_CONFIG_ENABLE_ALL_ASSERTIONS,0,bfm_index,

axi4_tr_if_0(bfm_index));

Alternatively, you a disable individual built-in assertions by using a sequence of get_config()

and set_config() commands on the respective assertion. For example, to disable assertion

checking for the AWLOCK signal changing between the AWVALID and AWREADY handshake

signals, use the following sequence of commands:

-- Define a local bit vector to hold the value of the assertion bit vector

variable config_assert_bitvector : std_logic_vector(AXI4_MAX_BIT_SIZE-1

downto 0);

-- Get the current value of the assertion bit vector

get_config(AXI4_CONFIG_ENABLE_ASSERTION, config_assert_bitvector,

bfm_index, axi4_tr_if_0(bfm_index));

-- Assign the AXI4_LOCK_CHANGED_BEFORE_AWREADY assertion bit to 0

config_assert_bitvector(AXI4_LOCK_CHANGED_BEFORE_AWREADY) := ‘0’;

-- Set the new value of the assertion bit vector

set_config(AXI4_CONFIG_ENABLE_ASSERTION, config_assert_bitvector,

bfm_index, axi4_tr_if_0(bfm_index));

Note

Do not confuse the AXI4_CONFIG_ENABLE_ASSERTION bit vector with the

AXI4_CONFIG_ENABLE_ALL_ASSERTIONS global enable/disable.

To re-enable the AXI4_LOCK_CHANGED_BEFORE_AWREADY assertion, following the

above code sequence, assign the assertion in the AXI4_CONFIG_ENABLE_ASSERTION bit

vector to 1.

For a complete listing of assertions, refer to “AXI4 Assertions” on page 678.

VHDL Monitor API

This section describes the VHDL Monitor API.

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