User guide

Chapter 17: Testbench and Design Example 17–17
Test Driver Module
December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
DMA Read Cycles
The procedure dma_rd_test used for DMA read uses the following three steps:
1. Configures the BFM shared memory with a call to the procedure
dma_set_rd_desc_data which sets three descriptor tables (Table 17–15,
Table 17–16, and Table 17–17).
Table 17–15. Read Descriptor 0
Offset in BFM
Shared Memory
Value Description
DW0 0x910 82
Transfer length in dwords and control bits as described in on
page 17–14
DW1 0x914 3 Endpoint address value
DW2 0x918 0 BFM shared memory data buffer 0 upper address value
DW3 0x91c 0x8DF0 BFM shared memory data buffer 0 lower address value
Data
Buffer 0
0x8DF0
Increment by 1 from
0xAAA0_0001
Data content in the BFM shared memory from address: 0x89F0
Table 17–16. Read Descriptor 1
Offset in BFM
Shared Memory
Value Description
DW0 0x920 1,024
Transfer length in dwords and control bits as described in on
page 17–14
DW1 0x924 0 Endpoint address value
DW2 0x928 10 BFM shared memory data buffer 1 upper address value
DW3 0x92c 0x10900 BFM shared memory data buffer 1 lower address value
Data
Buffer 1
0x10900
Increment by 1 from
0xBBBB_0001
Data content in the BFM shared memory from address:
0x10900
Table 17–17. Read Descriptor 2
Offset in BFM Shared
Memory
Value Description
DW0 0x930 644
Transfer length in dwords and control bits as described in
on page 17–14
DW1 0x934 0 Endpoint address value
DW2 0x938 0 BFM shared memory upper address value
DW3 0x93c 0x20EF0 BFM shared memory lower address value
Data
Buffer 2
0x20EF0
Increment by 1 from
0xCCCC_0001
Data content in the BFM shared memory from address:
0x20EF0