After a reset (internally pulled up, power up generates the first reset) and before the first time ON_OFF.
Pin Description Reset State
1 CTS/SPI_CL/GPIO6 Pad Enabled, Low, Weak Pull-down Enabled
2 RX/MOSI/SDA Pad Enabled, High
3 TX/MISO/SCL Pad Enabled, High
4 RTS/SPI_CS/GPIO7 Pad Enabled, High, Weak Pull-up Enabled
5 Reset Pad Enabled, High, Pull-up Enabled
6 Wakeup Pad Enabled, Low
7 On_OFF Pad Enabled, Low
8 Flash Enable Pad Enabled, Low
9 GPIO3 Pad Enabled, High
When the ON_OFF is pulsed for the first time the levels of GPIO6 and GPIO7 are read to configure the host interface.
The reset is looked at by SiRF/CSR as an “External emergency override of internal POR”, so it is recommend to control the GPS through the use of the ON_OFF pin