This channel is only present in programmable rate configurations.
Pinout
The configuration channel pinout is shown in the following table.
| Port Name | Port Width | Direction | Description |
|---|---|---|---|
| s_axis_config_tdata | Variable 1 | In | Carries the configuration information: RATE |
| s_axis_config_tvalid | 1 | In | Asserted by the external master to signal that it is able to provide data. |
| s_axis_config_tready | 1 | Out | Asserted by the CIC Compiler to signal that it is able to accept data. |
|
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TDATA Fields
The configuration channel (s_axis_config) is an AXI4 channel that
carries the fields shown in the following table in its TDATA vector.
| Field Name | Width | Padded | Description |
|---|---|---|---|
| RATE | log2(maximum rate + 1) | Yes | The interpolation or decimation rate of the core. |
The RATE field needs to be extended to the next 8-bit boundary if it does not already finish on an 8-bit boundary. The CIC Compiler core ignores the value of the padding bits, so they can be driven to any value. Connecting them to constant values can help reduce device resource usage.
TDATA Format
The configuration channel has one field which is packed into the
s_axis_config_tdata vector as shown in the
following figure (starting from the LSB):
Figure 1. Configuration Channel TDATA (s_axis_config_tdata)
Format
