TMS320C6671: What is the minimum value of tick period

Part Number:TMS320C6671

Tool/software: TI-RTOS

Hi,

The customer is now evaluating C6671 @1.0GHz DSP with TI-RTOS (SYS/BIOS).

Could you answer their questions below ? 

• What is the minimum value (usec) of tick period ?
  Default value seems to be 1000usec.
  http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/sysbios/6_21_01_16/exports/docs/docs/cdoc/ti/sysbios/knl/Clock.html

• Which document should they refer for the above info. ?

Thanks and regards,

Hideaki