Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manual do Utilizador descarregar pdf (Página 46)

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

SystemVerilog API Overview

Operational Transaction Fields

September 2013

Table 2-2. Handshake Signal Delay Transaction Fields

Note

The data channel handshake signal transaction fields (data_valid_delay[] and

data_ready_delay[]) are defined as arrays so that the *VALID to *READY delay can be

configured on a per data phase (beat) basis in a transaction.

AXI4 BFM Handshake Delay

The delay between the *VALID and *READY handshake signals for each of the five protocol

channels is controlled in a BFM test program using execute_*_ready(), get_*_ready(), and

get_*_cycle() tasks. The execute_*_ready() tasks place a value onto the *READY signals and

the get_*_ready() tasks retrieve a value from the *READY signals. The get_*_cycle() tasks wait

for a *VALID signal to be asserted and are used to insert a delay between the *VALID and

*READY signals in the BFM test program.

For example, the master BFM test program code below inserts a specified delay between the

read channel RVALID and RREADY handshake signals using the execute_read_data_ready()

and get_read_data_cycle() tasks.

// Set the RREADY signal to ‘0’ so that it is nonblocking

fork

bfm.execute_read_data_ready(1'b0);

join_none

// Wait until the RVALID signal is asserted and then wait_on the specified

// number of ACLK cycles

bfm.get_read_data_cycle;

repeat(5) bfm.wait_on(AXI4_CLOCK_POSEDGE);

// Set the RREADY signal to ‘1’ so that it blocks for an ACLK cycle

bfm.execute_read_data_ready(1'b1);

Signal Operational Transaction Field Configuration BFM

AWVALID address_valid_delay Master

AWREADY address_ready_delay Slave

WVALID data_valid_delay Master

WREADY data_ready_delay Slave

BVALID write_response_valid_delay Slave

BREADY write_response_ready_delay Master

ARVALID address_valid_delay Master

ARREADY address_ready_delay Slave

RVALID data_valid_delay Slave

RREADY data_ready_delay Master

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 782 783

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