Altera Stratix V Avalon-MM Interface for PCIe Solutions Manual de usuario Pagina 95

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Byte Offset
Register Dir Description
10011: Loopback.Exit
10100: Hot.Reset
10101: LOs
11001: L2.transmit.Wake
11010: Speed.Recovery
11011: Recovery.Equalization, Phase 0
11100: Recovery.Equalization, Phase 1
11101: Recovery.Equalization, Phase 2
11110: recovery.Equalization, Phase 3
14'h3C68 current_speed_reg[1:0]
O Indicates the current speed of the PCIe link. The
following encodings are defined:
2b’00: Undefined
2b’01: Gen1
2b’10: Gen2
2b’11: Gen3
14'h3C6C lane_act_reg[3:0]
O Lane Active Mode: This signal indicates the number
of lanes that configured during link training. The
following encodings are defined:
4’b0001: 1 lane
4’b0010: 2 lanes
4’b0100: 4 lanes
4’b1000: 8 lanes
Related Information
PCI Express Base Specification 2.1 or 3.0
PCI Local Bus Specification, Rev. 3.0
Programming Model for AvalonMM Root Port
The Application Layer writes the Root Port TLP TX Data registers with TLP formatted data for Configu‐
ration Read and Write Requests, Message TLPs, I/O Read and Write Requests, or single dword Memory
Read and Write Requests. Software should check the Root Port Link Status register (offset 0x92) to
ensure the Data Link Layer Link Active bit is set to 1'b1 before issuing a Configuration request to
downstream ports.
The Application Layer data must be in the appropriate TLP format with the data payload aligned to the
TLP address. Aligning the payload data to the TLP address may result in the payload data being either
aligned or unaligned to the qword. The following figure illustrates three dword TLPs with data that is
aligned and unaligned to the qword.
5-26
Programming Model for AvalonMM Root Port
UG-01097_avmm
2014.12.15
Altera Corporation
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