Altera Mentor Verification IP Altera Edition AMBA AXI4-Li Uživatelský manuál stáhnout pdf (Strana 129)

SystemVerilog Tutorials

Verifying a Master DUT

Mentor Verification IP AE AXI4-Lite User Guide, V10.3

129

April 2014

Advanced Slave API Definition

Note

You are not required to edit the following Advance Slave API unless you require a

different response than the default (OKAY) response.

The remaining section of this tutorial presents a walk-through of the Advanced Slave API in the

slave test program. It consists of four main tasks: process_read(), process_write(),

handle_read(), and handle_write() in the slave test program, as shown in Figure 6-7. There are

additional handle_write_addr_ready(), handle_read_addr_ready() and

handle_write_data_ready() tasks to handle the handshake AWREADY, ARREADY and

WREADY signals, respectively.

The Advanced Slave API is capable of handling pipelined transactions. Pipelining can occur

when a transaction starts before a previous transaction has completed. Therefore, a write

transaction that starts before a previous write transaction has completed can be pipelined.

Figure 6-7 shows the write channel with three concurrent write_trans transactions, whereby the

get_write_addr_phase[2], get_write_data_phase[1], and execute_write_response_phase[0] are

concurrently active on the write address, data, and response channels, respectively.

Similarly, a read transaction that starts before a previous read transaction has completed can be

pipelined. Figure 6-7 shows the read channel with two concurrent read_trans transactions,

whereby the get_read_addr_phase[1] and execute_read_data_phase[0] are concurrently active

on the read address and data channels, respectively.

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Altera Mentor Verification IP Altera Edition AMBA AXI4-Li Uživatelský manuál Strana 129