Outbound AXI-to-PCIe Address Translation Registers

The PCIe Controller uses these registers (ob_addr0 and ob_addr1) to perform outbound AXI to PCIe address translation for memory and I/O TLPs. For the configuration TLPs, the bus number, device number, and the function number can be programmed in the outbound AXI to PCIe address translation registers if the pass bits are programmed to pass fewer than specific bits.

Table 1. ob_addr1 Outbound AXI-to-PCIe Address Translation Registers
Bits Memory and I/O TLPs Vendor Defined Messages Normal Messages Default value
31:0 Upper [63:32] bits of the PCIe address. Vendor-defined message header [127:96] Reserved for normal messages 32'd0
Table 2. ob_addr0 Outbound AXI-to-PCIe Address Translation Registers
Bits Memory and I/O TLPs Vendor Defined Messages Normal Messages Default value
31:28 Lower [31:28] bits of the PCIe address. Vendor-defined message header [95:92] Reserved for normal messages 4'd0
27:20 Lower [27:20] bits of the PCIe address. Vendor-defined message header [91:84] Reserved for normal messages 8'd0
19:15 Lower [19:15] bits of the PCIe address. Vendor-defined message header [83:79] Reserved for normal messages 5'd0
14:12 Lower [14:12] bits of the PCIe address. Vendor-defined message header [78:76] Reserved for normal messages 3'd0
11:8 Lower [11:8] bits of the PCIe address. Vendor-defined message header [75:72] Reserved for normal messages 4'd0
7:6 Reserved. Reserved Reserved 2'd0
5:0 Number of address bits passed from AXI to PCIe. The PCIe Controller passes the programmed value + 1 bits from AXI to PCIe. The minimum value to be programmed into this field is 7 because the translation logic replaces the PCIe address's lower 8 bits with zeros. Reserved Reserved 6'd0

Some of the AXI slave outbound sddress (MASTER_AXI_AWADDR) bits convey the MSG_ROUTING and MSG_CODE fields of the message TLPs.

Table 3. MSG_ROUTING and MSG_CODE Fields
MASTER_ AXI_ AWADDR bits Vendor-Defined Message Normal Message
16
0: MSG with data
1: MSG without data
0: MSG with data
1: MSG without data
15
0: MSG_CODE = 0x7E
1: MSG_CODE = 0x7F
 MSG_CODE[7]
14:12 MSG_ROUTING MSG_CODE[6:4]
11:8 Reserved MSG_CODE[3:0]
7:5 Reserved MSG_ROUTING