3.6 GPO Mapping and Controller State Code

The following table describes all the relevant GPO mapping for the GPO pins of the ATA8352 UWB device. Activate them by using register A21. All the other GPO configurations are reserved; use them only for validation and device test functions. The GPIO in the ATA8350 UWB device is renamed GPO in the ATA8352 UWB device.

Table 3-1. GPO Mapping for the GPO Pins
Mux	Description	GPO[4]	GPO[3]	GPO[2]	GPO[1]	GPO[0]
5	AGC LUT pointer	AGC_p[0]	AGC_p[3]	AGC_p[2]	AGC_p[1]	AGC_p[4]
21	Shows PN31 error for the received data	Data bit valid	Sync Word Detected	Received data bit	PN31 Error	Expected Data bit
25	LE and Sync word detection	Data valid	Sync Detected	RXenable	LEvalid	LE stable
27	LE Tracking	LE_idx[4]	LE_idx[3]	LE_idx[2]	LE_idx[1]	LE_idx[0]
31	Controller state	Update data	State[3]	State[2]	State[1]	State[0]
32	Test f_BB on MST_CLK pin	0	pll_sb_locked	0	0	xtal_enb
33	PR failing due to SSID error or bad correlation	SSID correct	Sync Detected	TRXstate[1]	TRXstate[0]	Corr Correct
46	RXFIFO	Nearly full	Sync Detected	IRQ_RXready	IRQ_PRready	Overflow
47	TXFIFO	TX enable	Nearly empty	IRQ_TXready	IRQ_VRready	IRQ_Timeout

The following table lists the controller state codes for debugging on the GPO pins when using GPOMUX = 31 mode.

There are changes in the ATA8352 UWB device compared to the ATA8350 UWB device in the GPO descriptions. For example, 1011/1100, which aligns to the internal reference counter in the RXo Operating mode, is not available in the ATA8350 UWB device.

Table 3-2. GPO Mapping for the GPO Pins
Operating Mode	GPO State Code	Description
POWER DOWN	`0000`	The IC is powered down
IDLE	`0000`	Power supply is ON. The SPI is ready to accept commands
RX	`0101` `0110` `1011/1100`	Full RX mode, searching for preamble (`0101`), sync word locked RX mode receiving data (`0110`), and align to the internal reference counters (`1011`/`1100`)
TX	`1101`	Transmitting mode for data communication
RXo	`0101` `0110` `1000` `1010` `1001` `1011`/`1100`	Full RX mode, searching for preamble (`0101`), sync word locked RX mode receiving data (`0110`) + Align to the internal reference counters (`1000`) Clear RX mode (1010); RXo mode enable (`1001`) Align to the internal reference counters (`1011`/`1100`)
TXo	`1101`	Transmitting mode for data communication and postamble