| Port Name | I/O | Clock | Description |
|---|---|---|---|
| s_axis_lkup_tdata [S_LKUP_WIDTH-1:0] | I | key_clk | The Lookup Request key. tdata is padded with zeros to a byte multiple length. |
| s_axis_lkup_tready | O | key_clk | tready indicates that the core is ready to accept lookup requests. The ratio of LOOKUP_INTERFACE_FREQ and LOOKUP_RATE determines how frequently new lookups can be started. If LOOKUP_INTERFACE_FREQ equals LOOKUP_RATE than lookups can be started every clock cycle without gaps. |
| s_axis_lkup_tvalid | I | key_clk | Indicates that the lookup request key is valid. A lookup is initiated when both tready and tvalid are high for one clock cycle. |
| m_axis_lkup_tdata [M_LKUP_WIDTH-1:0] |
O | key_clk | The response value associated with the matching entry. |
| m_axis_lkup_tready | O | key_clk | tready for M_AXIS_DATA channel. Tie high if the downstream slave is always able to accept data from M_AXIS_DATA. |
| m_axis_lkup_tvalid | I | key_clk | tvalid for M_AXIS_DATA channel |
Figure 1. s_axis_lkup_data
S_LKUP_KEY_POS = 0
S_LKUP_WIDTH = 8 x floor((KEY_WIDTH + 7) / 8)
Figure 2. m_axis_lkup_data
M_LKUP_RESP_POS = 0
M_LKUP_FLAG_POS = 8 x floor((RESPONSE_WIDTH + 7) / 8)
M_LKUP_KEY_POS = 8 x (1 + floor(RESPONSE_WIDTH + 7) / 8)
M_LKUP_WIDTH = 8 x (floor(KEY_WIDTH + 7) / 8) + 2 + floor(RESPONSE_WIDTH + 7) / 8))
Figure 3. Lookup Interface Timing Diagram
