Zigbee Data Packager
Project Team : -
Marwa Mekki & Seray Bundu
What is Zigbee?
Wireless Personal Area Network
(WPAN) that is a ”superset” of IEEE 802.15.4 specification
IEEE specifies the PHYsical and Media Access Control (MAC) layers
Zigbee defines:- network, security and
application layers atop the PHY and
Zigbee application spheres
Technology that ranges from
sensor networks
industrial monitoring and control
home automation
medical and automotive solutions etc.
With low data levels that can be transmitted
from ranges 10 – 70m are possible.
Zigbee & ieee 802.15.4 overview
The standard specifies (for use by the PHY &
MAC layers) the freqs:
868, 915 MHz & 2.4 GHz for communication
PHY layer includes
Receiver energy detection (ED)
Link quality indication (LQI) and
Clear channel assessment (CCA)
MAC layer handles
Network association and disassociation
Zigbee & ieee 802.15.4 overview
The technology handles
Inter-operability
Conformance testing specifications
Device discovery
Network configuration and
Supports the star, mesh(peer-to-peer) and cluster-tree (hybrid tree/mesh).
The data will be transfered as packets with
maximum size of 128 bytes, enabling a maximum
payload of 104 bytes.
Zigbee & ieee 802.15.4 overview
Frame types used in data transmission are:
Data frame
MAC
Sublayer
PHY
layer
Frame Control
(2)
Sequence Number
(1)
Add fields (4 to 20)
Data payload
(104)
FCS (2)
MHR MSDU MFR
Preamble Seq.
(4)
Start of frame Delim.
(1)
Frame length
(1)
MPDU
SHR PHR PSDU
PPDU
Zigbee & ieee 802.15.4 overview
MAC command frame
MAC sublayer
PHY layer
Frame Control
(2)
Seq.
# (1) Add fields (4 to 20)
Comm type
(1)
Comm payload
(103)
FCS (2)
MHR MSDU MFR
Preamble
seq. (4) Start of frame delim (1)
Frame length
(1)
MPDU
SHR PHR PSDU
PPDU
Zigbee & ieee 802.15.4 overview
Beacon frame
MAC sublayer
PHY layer
Frame Control
(2)
Seq.
# (1) Add fields (4 to 10)
Superframe Specification
(2)
GTS fields (23)
Pending Add fields
(57)
Beacon payload
(32)
FCS (2)
MHR MSDU MFR
Preamble
seq. (4) Start of frame delim (1)
Frame length
(1)
PSDU
SHR PHR MPDU
PPDU
Zigbee & ieee 802.15.4 overview
Acknowledge frame
MAC sublayer
PHY layer
Frame Control
(2)
Seq
# (1) FCS (2)
MHR MFR
Preamble sequence
(4)
Start of frame delim (1)
Frame length
(1)
MPDU
SHR PHR PSDU
PPDU
Module Design
Interfaces
Clk Reset
W_E Request Addr Ack Data
Module µP
Base –
band
module
Module Design
For the 4 data types written to the RAM by the µP,
D a T a T y p
S I z e of
a d d
S I z e of P a y
Si z e of G T S
fi el
Si z e of p e n d a d d
P re a m bl e s e q u e n
” ” ” St
ar t of
fr a m e d el i m
Fr a m e C o n t r
” Fr a m e
L e n g th
D a ta
s e q u e n c
C o m m a n d T y p
S u p er
fr a m e S p e
” G
T S
fi el
d s
P e n di n g
a d d
fi el
A d dr
e s s In fo
P a y L o a d
R e g I S T E r
Module Design
Register
Clk
En_Reg qout Data
Reset
Ram
Reg µP
Add G
Control
CRC 3 2
Register
Module Design
Address decoder
Clk
En En_Reg Addr
Ram
Reg µP
Add G
Control
CRC 3 2
Add
Dec
Module Design
Controller
clk en_mux ack en_crc
Request sel, add
reset en_add_gen, init_add_gen start reset_crc
frame reset reg, add_gen
Ram
Reg µP
Add G
Control
CRC 3 2
Controller
Module Design
Address generator
clk reset add en
init gen_ack frame_type gen_out
Ram
Reg µP
Add G
Control
CRC 3 2
Data Type
Size of Address Info
Size of payload
Size of GTS fileds
Size of Pending Add
Module Design
Multiplexer
8-bit addr/data
8-bit o/p 8-bit addr/data
Control switch
Ram
Reg µP
Add G
Control
CRC 3 2
Module Design
CRC
G(x) = x16 + x12 + x5 + 1 and parallel LFSR
clk
en o/p high Initialize o/p low data_in
CRC
computer
Module Design
Data flow
μP RAM
Reg Add
Dec
MUX 1
Add Gen
Controller
MUX 2
