The Configuration Extend interface allows the core to transfer configuration information with the user application when externally implemented configuration registers are implemented. The following table defines the ports in the Configuration Extend interface of the core.
Configuration Extend Read Received
The core asserts this output when it has received a configuration read request from the link. When neither user-implemented legacy or extended configuration space is enabled, receipt of a configuration read results in a one-cycle assertion of this signal, together with valid cfg_ext_register_number and cfg_ext_function_number.
When user-implemented legacy, extended configuration space, or both are
enabled, for the
Extended Configuration space:
0x480 - 0x4FF
Configuration Extend Write Received
The core generates a one-cycle pulse on this output when it has received a configuration write request from the link.
Configuration Extend Register Number
The 10-bit address of the configuration register being read or written. The data is valid when cfg_ext_read_received or cfg_ext_write_received is High.
Configuration Extend Function Number
The 8-bit function number corresponding to the configuration read or write request. The data is valid when cfg_ext_read_received or cfg_ext_write_received is High.
Configuration Extend Write Data
Data being written into a configuration register. This output is valid when cfg_ext_write_received is High.
Configuration Extend Write Byte Enable Byte enables for a configuration write transaction.
Configuration Extend Read Data
You can provide data from an externally implemented configuration register to the core through this bus. The core samples this data on the next positive edge of the clock after it sets cfg_ext_read_received High, if you have set cfg_ext_read_data_valid.
Configuration Extend Read Data Valid
The user application asserts this input to the core to supply data from an externally implemented configuration register. The core samples this input data on the next positive edge of the clock after it sets cfg_ext_read_received High.