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Registers
MDMCTRL2 (0x6192) – Modem Configuration
Bit
Name Reset R/W Description
No.
7
SW_BIT_ORDER
0 R/W
0: The sync word is transmitted LSB to MSB (from SYNC_WORD[0] to
SYNC_WORD[31]), and in receive the correlator expects this bit
ordering.
1: The sync word is transmitted MSB to LSB (from SYNC_WORD[31]
to SYNC_WORD[0]), and in receive the correlator expects this bit
ordering.
6
DEM_PREAM_MODE
0 R/W
Use PREAM_SEL[1:0] or 1s complement of PREAM_SEL[1:0] for
frequency offset estimation.
5:4
PREAM_SEL[1:0]
00 R/W 00: Select preamble based on first bit of sync word; last bit of preamble is
inverse of first bit of sync word.
01: Select preamble based on first bit of sync word; last bit of preamble is
same as first bit of sync word.
10: Use preamble 0101 0101
11: Use preamble 1010 1010
3:0
NUM_PREAM_BYTES[3:0]
0000 R/W The number of preamble bytes to be sent in Tx mode prior to the sync
word
0000: 1 leading preamble byte
0001: 2 leading preamble bytes
0010: 3 leading preamble bytes
0011: 4 leading preamble bytes
…
1111: 16 leading preamble bytes
MDMCTRL3 (0x6193) – Modem Configuration
Bit
Name Reset R/W Description
No.
7:6
SYNC_MODE[1:0]
01 R/W 00: Correlation above threshold is sufficient as sync criterion.
01: Correlation value above threshold and data decision on all symbols of
sync word is used as sync criterion.
10: Correlation value above threshold and data decision on all symbols of
sync word is used as sync criterion. Accept one bit error in sync word
11: Reserved
5
RAMP_AMP
1 R/W 1: Enable ramping of DAC output amplitude during startup and finish.
0: Disable ramping of DAC output amplitude.
4:3
RFC_SNIFF_CTRL[1:0]
00 R/W Enable / disable rfc_sniff.
00: Sniffer disabled
01: Output data out of the BSP
10: Output data out of the modulator before the BSP
11: Output data out of the demodulator before the BSP
2 – 0 R0 Reserved. Read as 0.
1:0
RSSI_MODE[1:0]
00 R/W Controls mode of RSSI
00 : Continuous mode
01 : Freeze estimate at sync
10 : Peak detect
11 : Continuous before sync, peak detect after sync
341
SWRU191C–April 2009–Revised January 2012 CC2541 Proprietary Mode Radio
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