參數(shù)資料
型號(hào)： MRF24J40-IMM
廠商： Microchip Technology Inc.
英文描述： IEEE 802.15.4⑩ 2.4 GHz RF Transceiver
中文描述： IEEE 802.15.4標(biāo)準(zhǔn)⑩2.4 GHz射頻收發(fā)器
文件頁數(shù)： 31/66頁
文件大小： 748K
代理商： MRF24J40-IMM
2006 Microchip Technology Inc.
Advance Information
DS39776A-page 29
MRF24J40
7.0
TRANSMITTING AND
RECEIVING PACKETS
7.1
Transmitting Packets
The MAC inside the MRF24J40 will automatically
generate the preamble and Start-of-Frame delimiter
fields when transmitting. Additionally, the MAC can
generate any padding (if needed), and the CRC, if
configured to do so. The host controller must generate
and write all other frame fields into the buffer memory
for transmission. Before transmitting packets, the MAC
registers, which alter the transmission characteristics,
should be initialized as documented in
Section 6.0
“Initialization”
.
7.2
TX FIFO Format
The TX MAC performs three major tasks conforming to
IEEE 802.15.4:
TX FIFO Control
Automatic CSMA-CA and Timing Alignments
Hardware Superframe Handling
For TX FIFO control function, TX MAC controls
4 FIFOs, including beacon, normal and 2 GTS FIFOs.
When each FIFO is triggered, TX MAC performs a
CSMA-CA algorithm, sends a packet to the Transmit
Baseband (TXBB) at the right time, handles the
retransmission if an ACK is required but not received
and generates FCS bytes automatically.
The automatic CSMA-CA algorithm performs timing
alignments, such as LIFS, SIFS and ACK turnaround
time. The user can simply program parameters for the
CSMA-CA algorithm. The TX MAC will perform
automatically according these parameters.
For hardware superframe handling, TX MAC builds up
the timing frame of a superframe. It includes CAP, CFP,
INACTIVE and each time slot. TX MAC sends beacon,
normal and GTS FIFOs at the right time, automatically, at
each transmission. This largely reduces the complexity of
the Beacon Enable mode of IEEE 802.15.4.
FIGURE 7-1:
TRANSMIT PACKET LAYOUT
Address
Header Length
Memory
Description
Packet Length
(m + 3)
Frame Control
Sequence Number
Data[0]
Data[m – 1]
Length of the header. This field is described in more
detail in the security section of this document.
The length of the packet, not including the length or FCS.
The destination and source addressing information,
as well as any application data.
Data[...]
0x000
0x001
0x002-0x003
0x004
0x005
The frame control field describing how this packet should
behave.
The sequence number distinguishing this packet.
FCS[1]
FCS[0]
The CRC value for the packet; written by hardware.
0x005 + (m – 1)
0x006 + m
0x007 + m
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MRF24J40MA 制造商:Microchip Technology Inc 功能描述:WIRELESS TRANCEIVER MODULE, Supply Voltage Min:2.4V, Supply Voltage Max:3.6V, MS
MRF24J40MA-I/RM 功能描述:Zigbee/802.15.4模塊 2.4GHz IEEE 802.15.4 Transceiver Module RoHS:否 制造商:Digi International 頻帶:902 MHz to 928 MHz 視線范圍: 數(shù)據(jù)速率: 靈敏度: 工作電源電壓:2.4 V to 3.6 V 傳輸供電電流:215 mA 接收供電電流:26 mA 輸出功率:250 mW 天線連接器類型:Wire 最大工作溫度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm
MRF24J40MAT-I/RM 功能描述:射頻接收器 2.4GHz IEEE 802.15.4 Transceiver Module RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
MRF24J40MB-I 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4a?￠ 2.4 GHz RF Transceiver
MRF24J40MB-I/RM 功能描述:Zigbee/802.15.4模塊 2.4GHz, 802.15.4 Xcvr w/int PA RoHS:否 制造商:Digi International 頻帶:902 MHz to 928 MHz 視線范圍: 數(shù)據(jù)速率: 靈敏度: 工作電源電壓:2.4 V to 3.6 V 傳輸供電電流:215 mA 接收供電電流:26 mA 輸出功率:250 mW 天線連接器類型:Wire 最大工作溫度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm
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