1322XUSB Freescale Semiconductor, 1322XUSB Datasheet - Page 16

• Manufacturer Part Number: 1322XUSB
• Description: KIT USB 1322X
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of 1322XUSB

• Frequency: 2.4GHz
• Wireless Frequency: 2.4 GHz
• Interface Type: USB
• Security: 128 bit AES
• Operating Voltage: 2 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Silicon Manufacturer: Freescale
• Silicon Core Number: MC13224
• Kit Application Type: Communication & Networking
• Application Sub Type: ZigBee
• Kit Contents: USB Stick, IAR Software
• Rohs Compliant: Yes
• For Use With/related Products: MC1322x
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MACA is responsible for construction of packets for TX including FCS, and for parsing the received
packets. The MACA will also handle ACKs and TxPoll sequences independent of the ARM processor.
During TX the MACA will construct the entire packet. This includes preamble and SFD (start of frame
delimiter). During receive, the modem will recognize preamble and SFD, then the MACA will begin
receiving the packet with the first bit of frame length, and finally, will check the FCS.
3.4.1.1
In order to reduce CPU load, the MACA module has embedded features for controlling parts of the IEEE
802.15.4 PHY and MAC layer requirements. The MACA core features include:
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Sequence Manager sequences / auto sequences
— RX only
— TX only
— Automatic acknowledgment frame reception on transmitted packets
— Automatic acknowledgment frame transmission on received packets
— Auto-RX for continuous reception as coordinator
— Auto sequence for transmitted MAC data.request
— Assist for efficient response to MAC data.request
— Embedded channel assessment in sequence
— Support for sequences with slotted mode access
— Timer triggered and immediately executed actions
— Support for extended RX for reception in random backoff and battery life extension
— Support for promiscuous mode
Programmable auto sequence timing - Each CCA, RX, or TX event is an independent operation.
The radio gets through a power-up or “warm-up” sequence for each operation (including VCO),
and there is also a power-down or “warm-down” time. Sequences are combinations of radio
operations and are highly configurable.
— RX warm-up is 72 µs
MACA Features
Transceiver
Modem
To
Figure 5. MAC Accelerator Simplified Block Diagram
FCS Generator/
Sequencer
RX Packet
TX Packet
MC1322x Technical Data, Rev. 1.3
Checker
Buffer
Buffer
Timers
DMA
Registers
Control
MACA
MCU
Bus
To
Freescale Semiconductor