4.3.4. Hard IP Reconfiguration Interface
This interface is an Avalon® -MM slave interface with a 32‑bit address and an 8‑bit data bus. You can use this interface to dynamically modify the value of configuration registers. Note that after a warm reset or cold reset, changes made to the configuration registers of the Hard IP via this interface are lost as these registers revert back to their default values.
In Root Port mode, the application logic uses this interface to access its PCIe configuration space to perform link control functions (such as Hot Reset, link disable, or link retrain).
In TLP Bypass mode, the Hard IP forwards the received Type0/1 Configuration request TLPs to the application logic, which must respond with Completion TLPs with a status of Successful Completion (SC), Unsupported Request (UR), Configuration Request Retry Status (CRS), or Completer Abort (CA). If a received Configuration request TLP needs to update a PCIe configuration space register, the application logic needs to use the Hard IP Reconfiguration interface to access that PCIe configuration space register.
|pX_hip_reconfig_readdata_o[7:0] where X = 0, 1, 2, 3||Output||Avalon® -MM read data outputs||EP/RP/BP||slow_clk|
|pX_hip_reconfig_readdatavalid_o where X = 0, 1, 2, 3||Output||Avalon® -MM read data valid. When asserted, this signal indicates that the data on hip_reconfig_readdata_o[7:0] is valid.||EP/RP/BP||slow_clk|
|pX_hip_reconfig_write_i where X = 0, 1, 2, 3||Input||Avalon® -MM write enable||EP/RP/BP||slow_clk|
|pX_hip_reconfig_read_i where X = 0, 1, 2, 3||Input|| Avalon® -MM read enable.
Note: This interface is not pipelined. User application must wait for the return of the data from the current read (on hip_reconfig_readdata_o[7:0]) before starting another read operation.
|pX_hip_reconfig_address_i[31:0] where X = 0, 1, 2, 3 Figure 35||Input||
Avalon® -MM reconfiguration address.
Following is the mapping for the pX_hip_reconfig_address_i[31:0] bus:
|pX_hip_reconfig_writedata_i[7:0] where X = 0, 1, 2, 3||Input||Avalon® -MM write data inputs||EP/RP/BP||slow_clk|
|pX_hip_reconfig_waitrequest_o where X = 0, 1, 2, 3||Output||When asserted, this signal indicates the IP core is not ready to respond to a request.||EP/RP/BP||slow_clk|
As an example, Hard IP Reconfiguration Interface when performing a read operation shows the behavior of the Hard IP Reconfiguration Interface when performing a read operation to the Current Link Speed and Negotiated Link Width fields of the Link Status Register, when the R-Tile Avalon Streaming IP for PCIe is configured in Gen5 x16 mode with a single physical function enabled. For additional details on configuration space registers, refer to Configuration Space Registers.
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