CYRF69103
Document #: 001-07611 Rev *B
Page 5 of 73
Data Transmission Modes and Data Rates
The SoC supports four different data transmission modes:
• In GFSK mode, data is transmitted at 1 Mbps, without any
DSSS.
• In 8DR mode, 8 bits are encoded in each
DATA_CODE_ADR derived code symbol transmitted.
• In DDR mode, 2-bits are encoded in each
DATA_CODE_ADR derived code symbol transmitted. (As
in the CYWUSB6934 DDR mode).
• In SDR mode, 1 bit is encoded in each DATA_CODE_ADR
derived code symbol transmitted. (As in the CYWUSB6934
standard modes.)
Both 64-chip and 32-chip DATA_CODE_ADR codes are
supported. The four data transmission modes apply to the data
after the SOP. In particular the length, data, and CRC16 are all
sent in the same mode. In general, lower data rates reduces
packet error rate in any given environment.
The CYRF69103 IC supports the following data rates:
• 1000-kbps (GFSK)
• 250-kbps (32-chip 8DR)
• 125-kbps (64-chip 8DR)
• 62.5-kbps (32-chip DDR)
• 31.25-kbps (64-chip DDR)
• 15.625-kbps (64-chip SDR)
Lower data rates typically provide longer range and/or a more
robust link.
Link Layer Modes
The CYRF69103 IC device supports the following data packet
framing features:
SOP – Packets begin with a 2-symbol Start of Packet (SOP)
marker. This is required in GFSK and 8DR modes, but is
optional in DDR mode and is not supported in SDR mode; if
framing is disabled then an SOP event is inferred whenever
two
successive
correlations
are
detected.
The
SOP_CODE_ADR code used for the SOP is different from that
used for the “body” of the packet, and if desired may be a
different length. SOP must be configured to be the same
length on both sides of the link.
EOP – There are two options for detecting the end of a packet.
If SOP is enabled, then a packet length field may be enabled.
GFSK and 8DR must enable the length field. This is the first
8 bits after the SOP symbol, and is transmitted at the payload
data rate. If the length field is enabled, an End of Packet (EOP)
condition is inferred after reception of the number of bytes
defined in the length field, plus two bytes for the CRC16 (if
enabled—see below). The alternative to using the length field
is to infer an EOP condition from a configurable number of
successive non-correlations; this option is not available in
GFSK mode and is only recommended when using SDR
mode.
CRC16 – The device may be configured to append a 16-bit
CRC16 to each packet. The CRC16 uses the USB CRC
polynomial with the added programmability of the seed. If
enabled, the receiver will verify the calculated CRC16 for the
payload data against the received value in the CRC16 field.
The starting value for the CRC16 calculation is configurable,
and the CRC16 transmitted may be calculated using either the
loaded seed value or a zero seed; the received data CRC16
will be checked against both the configured and zero CRC16
seeds.
CRC16 detects the following errors:
• Any one bit in error
• Any two bits in error (no matter how far apart, which column,
and so on)
• Any odd number of bits in error (no matter where they are)
• An error burst as wide as the checksum itself
Figure 2 shows an example packet with SOP, CRC16 and
lengths fields enabled.
Figure 2. Example Default Packet Format
Packet Buffers and Radio Configuration Registers
Packet data and configuration registers are accessed through
the SPI interface. All configuration registers are directly
addressed through the address field in the SPI packet (as in
the CYWUSB6934). Configuration registers are provided to
allow configuration of DSSS PN codes, data rate, operating
mode, interrupt masks, interrupt status, and others.
Packet Buffers
All data transmission and reception uses the 16-byte packet
buffers—one for transmission and one for reception.
The transmit buffer allows a complete packet of up to 16 bytes
of payload data to be loaded in one burst SPI transaction, and
then transmitted with no further MCU intervention. Similarly,
the receive buffer allows an entire packet of payload data up
to 16 bytes to be received with no firmware intervention
required until packet reception is complete.
P
SOP 1
SOP 2
Length
CRC 16
Payload Data
Preamble
n x 16us
1st Framing
Symbol*
2nd Framing
Symbol*
Packet
length
1 Byte
Period
*Note:32 or 64us
[+] Feedback
[+] Feedback
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
