Polarity of DCLK signal in EPCS16?

I am using cyclone iii ep3c25 fpga in which I have designed an sopc system which has altera spi ip. I want to access EPCS16 flash using this SPI. For that, what polarity should i kept for the sclk signal of spi? From datasheet of EPCS16 I got that the phase of DCLK is 1. but i couldn't find the polarity of dclk.