RFW-D100 Vishay, RFW-D100 Datasheet - Page 32

• Manufacturer Part Number: RFW-D100
• Manufacturer: Vishay

Specifications of RFW-D100

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Package Type: LQFP
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / Rohs Status: Supplier Unconfirmed

RFW-D100
Vishay RFWaves
APPENDIX B - RFWAVES PACKET STRUCTURE
This section describes the recommended packet structure when using RFWaves hardware. The packet structure is
closely tied with the RFW-D100.
Using 8 bits for DST ID means that each network will
have at most 256 participants.
The location of the DST ID field is recommended to be
constant in the packet header, since it enables the
RFW-D100 to filter packets according to their DST ID.
Few of the address are preserved in the RFW-D100 for
multicast.
www.vishay.com
32
• PREAMBLE- The purpose of the PREAMBLE is to
• NETWORK- The RFWaves network field is
• DST ID (8 bits) - determines the destination of the
PREAMBLE –
2 octets
synchronize the receiver with the transmitter. The
transmitted preamble is set to 16 bits. The
correlation in the receiver RFW-D100 is actually
done only on 8 ⇔16 bits. The first 0 to 8 transmitted
bits are ignored in the receiver. Nevertheless, it is
important to transmit all the 16 bits of preamble
since it initializes the receiver.
recommended to be 16 ⇔ 32 bits. This determines
the total number of RFWaves networks that can
coexist without an address collision (6.5e4 ⇔ 4e9
networks). The RFW-D100 implements 8-bit
network id filter, in order to filter packets sent by
other networks. This should reduce the overhead
on the MCU.
packet.
NETWORK –
4-2 octets
DST ID –
1 octet
For more information please contact: [e-mail]
SRC ID –
1 octet
SEQUENCE –
1 octet
This field should be set to a fixed position, since it is
read
programmed to read a certain location).
This field is optional, since in some networks the
packet size is fixed (the RFW-D100 can be
programmed to receive only fixed sized packets).
CRC (16 bits) – 16 is used for error detection. This
function is implemented in the RFW-D100, which
means there is no processing overhead on the MCU.
The usage of the 16-CRC is optional. The RFW-D100
also supports 8-CRC (8 bits) for applications that are
more sensitive to the overhead. The CRC can also be
entirely removed.
• SRC ID (8 bits) – determines who sent the packet.
• SEQUENCE (8 bits)- determines the sequence
• SIZE (8 bits) – determines the size of the packet in
• PAYLOAD – data for higher layers protocols and/or
SIZE – 1 octet
(optional)
number of this packet. The sequence number is
used to identify this specific packet in order to
implement a reliable protocol (using ACKs and
retransmissions).
bytes units, excluding the preamble. The maximum
size of a packet is 255 bytes.
applications. The size of this field is the value of
SIZE field minus all the overhead of the protocol
(NETWORK, DST ID, SRC ID, SEQUENCE, SIZE,
and CRC) excluding the PREAMBLE.
by
the
PAYLOAD – determined
by SIZE (0-255 octets)
RFW-D100
(the
Document Number 84675
CRC –
2 octets (optional)
Rev. 1.1, 22-Jan-07
RFW-D100
is