Silicon Laboratories Si446 Series, Manual

Page: 37 / 112

AN625
Rev. 0.1 37
3.2.17. START_RX
 Summary: Switches to RX state. Command arguments are retained though sleep state, so these only need to
be written when they change.
 Purpose

Switches to RX state when condition is met and switch to specified state when RX packet completes. Command
arguments are retained though sleep state, so they only need to be written when they change. CTS will not return until in
RX mode
 Command Stream
 Reply Stream
 Parameters

CHANNEL[7:0] - Channel number to transmit the packet on. Frequency is determined using integer, fractional, and step
size properties in the FREQ_CONTROL property group. This value will be overwritten with START_TX:CHANNEL

START
0 = Start RX immediately.
1 = Start RX when wake up timer expires.

RX_LEN[15:0] - If this field is nonzero, the packet will be received using only field 1 with no packet handler features (eg.
crc, whitening). If this field is zero, the configuration of the packet handler fields is used.

RXTIMEOUT_STATE[3:0] - If preamble detection times out, RX will transition to RXTIMEOUT_STATE. See
PREAMBLE_CONFIG_STD_2 for details regarding how to configure preamble timeout.
0 = No change
1 = Sleep state.
2 = Spi Active state.
3 = Ready state.
4 = Another enumeration for Ready state.
5 = Tune state for TX.
6 = Tune state for RX.
7 = TX state.
8 = RX state.
START_RX Command 7 6 5 4 3 2 1 0
CMD 0x32
CHANNEL CHANNEL[7:0]
CONDITION 0000000 START
RX_LEN RX_LEN[15:8]
RX_LEN RX_LEN[7:0]
NEXT_STATE1 0000 RXTIMEOUT_STATE[3:0]
NEXT_STATE2 0000 RXVALID_STATE[3:0]
NEXT_STATE3 0000 RXINVALID_STATE[3:0]
START_RX Reply 7 6 5 4 3 2 1 0
CMD_COMPLETE CTS[7:0]