The maximum achievable Slave Serial Programming Interface (SSPI) programming frequency with HW-USBN-2A cable is 1.5 MHz, when the TCK value is either set to 0 or 1.
For other values of TCK (2 to 10), the SSPI programming frequencies are listed below:
TCK | Frequency
0 1.5 MHz
1 1.5 MHz
2 125 kHz
3 93.75 kHz
4 75 kHz
5 62.5 kHz
6 53.58 kHz
7 46.88 kHz
8 41.67 kHz
9 37.5 kHz
10 34 kHz