2.4.1. Testbench
Figure 7. Block Diagram of the Design Example Multiport 10/100/1000Mb Ethernet MAC with 1000BASE-X/SGMII PCS with LVDS I/O Simulation Testbench
A successful testbench sends ten packets and receives the same number of packets. The following sample output illustrates the excerpt of the output:
Figure 8. Simulation Test Result of VCS Simulator
Statistics MAC Tx Path
— Frames sent in TX path total: 10
— Tx_good_sent: 10
— Tx_vlan_sent: 0
— Tx_stack_vlan_sent: 0
— Payload_err_sent: 0
Statistics MAC Rx Path — Loopback Test
— Rx_good_rcvd: 10
— Rx_vlan_rcvd: 0
— Rx_stack_vlan_rcvd: 0
— Rx_fifo_overflow_rcvd: 0
— Rx_payload_err_rcvd: 0
— Rx_crc_err_rcvd: 0
-- The total number of good packets received by the traffic monitor: 10
-- The total number of packets received with CRC error: 0
-- Loopback Simulation Ended with no Error
- -------------------------------------------------------------------------- -
End of Simulation — Break
$finish called from file "basic_avl_tb_top_mac_pcs.sv", line 5380.
$finish at simulation time 327000000000
V C S S i m u l a t i o n R e p o r t
Time: 327000000000 fs
CPU Time: 259.890 seconds; Data structure size: 9.3Mb