Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manual do Utilizador descarregar pdf (Página 643)

100

101

VHDL Tutorials

Verifying a Master DUT

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

623

September 2013

AXI3 Basic Slave API Definition

The Slave Test Program Basic API contains:

• Procedures that read and write a byte of data to internal memory do_byte_read() and

do_byte_write(), respectively.

• Procedures to configure the AXI3 protocol channel handshake delays

set_read_address_ready_delay(), set_write_address_ready_delay(),

set_write_data_ready_delay(), set_read_data_valid_delay() and

set_wr_resp_valid_delay().

• Procedures to process read and write transactions, process_read and process write,

respectively. If you need to create other responses, such as EXOKAY, DECERR, or

SLVERR, then you must edit these procedures to provide the required response.

• A slave_mode transaction field to control the behavior of reading and writing to the

internal memory.

• Configuration variables m_max_outstanding_read_trans and

m_max_outstanding_write_trans back-pressure a master from transmitting additional

read and write transactions when the configured value has been reached.

The internal memory for the slave is defined as an array of 8-bits, so that each byte of data is

stored as an address/data pair.

Example 11-16. internal memory

type memory_t is array (0 to 2**16-1) of std_logic_vector(7 downto 0);

shared variable mem : memory_t;

The do_byte_read() procedure, when called, reads a data byte from the internal memory mem,

given an address location addr, as demonstrated in Example 11-17.

You can edit this procedure to modify the way the read data is extracted from the internal

memory.

Example 11-17. do_byte_read()

-- Procedure : do_byte_read

-- Procedure to provide read data byte from memory at particular input

-- address

procedure do_byte_read

(

addr : in std_logic_vector(AXI_MAX_BIT_SIZE-1 downto 0);

data : out std_logic_vector(7 downto 0)

) is

begin

data := mem(to_integer(addr));

end do_byte_read;

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