Maximum external TMR_CLK frequency for ADSP-21571

I am reading the ADSP-SC570/SC571/SC572/SC573/ADSP-21571/21573 datasheet, rev.B.

I would like to know the maximum  external TMR_CLK frequency.

On page 102, the datasheet states: "for the external TMR_CLK maximum frequency, see the fTMRCLKEXT specification in Table 27.", but I there is no fTMRCLKEXT in Table 27 or elsewhere; well at least I cannot find it.

I hope someone can help me,

kind regards

Francesco