SCI SPI producing chip select for every byte?

I'm trying to clock out a series of bytes under a single chip select over spi, but what I get is a chip select per byte.  I'm calling the following::

g_sf_spi_device0.p_api->write(g_sf_spi_device0.p_ctrl, pData, 10, SPI_BIT_WIDTH_8_BITS, TX_WAIT_FOREVER);

In module configuration it shows the DTC transfer size set to 1 byte.  This parameter is locked.  How can I unlock, or set this parameter to allow for an variable (aka. actual value in the write command) length send under one chip select?

Thanks,

Rich