Performance - 3.1 English - PG319

Semi-Ternary CAM Search v3.1 LogiCORE IP Product Guide (PG319)

Document ID
PG319
Release Date
2024-11-27
Version
3.1 English

Maximum Frequencies

The Semi-Ternary CAM Search IP is designed to run at up to 500 MHz (low voltage)/600 MHz (mid voltage) for -2 speed grade devices.

Latency

The STCAM lookup latency depends on the size of the STCAM, the TDM factor and memory type. The lookup latency is constant for fixed rate STCAM and some examples are shown in the following table.

Table 1. Lookup Latency
Entries TDM Factor = 1 TDM Factor = 4 TDM Factor = 16 TDM Factor = 32
256 26 16 11 10
1K 31 17 11 10
4K 32 17 11 10
16K 39 18 11 10
Note: Latency values are measured in lookup interface frequency cycles:

KEY_WIDTH = 32, RESPONSE_WIDTH = 16, NUM_MASKS = 32, LOOKUP_RATE = LOOKUP_INTERFACE_FREQ = 15M.

The lookup latency is not constant for variable rate STCAM. The latency value shown in the GUI represents the minimum lookup latency.