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| 型号： | I5104XY |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 音频合成 |
| 英文描述： | 262.2 SEC, SPEECH SYNTHESIZER WITH RCDG, UUC25 |
| 封装： | DIE-25 |
| 文件页数： | 64/87页 |
| 文件大小： | 616K |
| 代理商： | I5104XY |
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68
8393B-MCU Wireless-02/13
ATmega256/128/64RFR2
On receive the PHR is returned as the first octet during Frame Buffer read access, the
most significant bit always set to 0. For IEEE 802.15.4 compliant operation bit 8 has to
be masked by software. The reception of a valid PHR is signaled by a
TRX24_RX_START interrupt.
On transmit the PHR has to be written first to the Frame Buffer.
9.5.1.1.3 PHY Payload (PHY Service Data Unit, PSDU)
The PSDU has a variable length between 0 and aMaxPHYPacketSize (127, maximum
PSDU size in octets) whereas the last two octets are used for the Frame Check
Sequence (FCS). The length of the PSDU is signaled by the frame length field (PHR)
as described in Table 9-18 below. The PSDU contains the MAC Protocol Layer Data
Unit (MPDU).
Received frames with a frame length field set to 0x00 (invalid PHR) are not by an
interrupt.
Table 9-18 below summarizes the type of payload versus the frame length value.
Table 9-18. Frame Length Field - PHR
Frame Length Value
Payload
0 - 4
Reserved
5
MPDU (Acknowledgement)
6 – 8
Reserved
9 - aMaxPHYPacketSize
MPDU
9.5.1.2 MAC Protocol Layer Data Unit (MPDU)
Figure 9-16 below shows the frame structure of the MAC layer.
Figure 9-16. IEEE 802.15.4 Frame Format - MAC-Layer Frame Structure (MPDU)
9.5.1.2.1 MAC Header (MHR) Fields
The MAC header consists of the Frame Control Field (FCF), a sequence number, and
the addressing fields (which are of variable length and can even be empty in certain
situations).
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