Buses control for RZT1

Hello,

     I use R7S910035,e2stdio and AP4 to configure Buses for SRAM, 32bit data length. CS0. when i write data to sram,I can see from the oscilloscope that it takes 1 second to send the second time, which is too slow. I want a microsecond level sending time. How can I set it?? When I read data, I can read continuously at the microsecond level.