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参数资料
| 型号： | DR-TRC103-915-EV |
| 厂商： | RFM |
| 文件页数： | 59/65页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 915MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器，SRR |
| 频率： | 902MHz ~ 928MHz |
| 适用于相关产品： | TRC103-915 |
| 已供物品： | 2 个板，天线，电池 |
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MCFG05 bits 7..6 set the length of the FIFO as shown in Table 78. The length of the FIFO must be equal to or
greater than the packet payload length set in PKTCFG1C , as discussed below.
MCFG05 bits 7..6
00
01
10
11
FIFO Length
16 bytes
32 bytes
48 bytes
64 bytes
Table 78
The integer value of MCFG05 bits 5..0 + 1 sets the FIFO interrupt threshold. When receiving in Packet data
mode, FIFO_Int_Rx is triggered when the number of bytes in the FIFO is equal to or greater than the threshold.
FIFO_Int_Tx is triggered when the number of bytes in the FIFO is equal to or less than the threshold value. Two
additional interrupts, nFIFOEMPY and FIFOFULL provide signaling that a packet transmission is complete or a
full packet has been received respectively.
Packet data mode formats are discussed in Section 3.9. Packet data mode options are configured in registers
PKTCFG1C through PKTCFG1F. Setting PKTCFG1C bit 7 to 1 selects Manchester encoding/decoding. Man-
chester encoding provides excellent DC-balance and other characteristics that support robust communications,
but effectively doubles the number of bits needed to transmit the packet payload. Scrambling provides adequate
DC-balance in many applications without doubling the number of bits in the payload. It is not necessary to enable
both Manchester encoding and scrambling. PKTCFG1C bits 6..0 configure the payload size (not including the
preamble and start pattern) in fixed format and maximum allowed length byte value in variable length and extend-
ed variable length formats. In a variable length format, a received packet with a length byte value greater than the
maximum allowed is discarded. PKTCFG1D bits 7..0 hold the node address byte used to identify a specific radio
in a network.
PKTCFG1E bit 7 configures the basic packet format. Setting this bit to 0 selects the fixed-length format, and set-
ting this bit to 1 selects the variable length format. PKTCFG1E bits 6..5 set the preamble length:
PKTCFG1E bits 6..5
00
01
10
11
Preamble Length
1 byte
2 bytes
3 bytes
4 bytes
Table 79
For most applications a preamble length of three or four bytes is recommended. PKTCFG1E bit 4 controls DC-
balanced scrambling. Setting this bit to 1 enables scrambling. PKTCFG1E bit 3 controls CRC calculations. Setting
his bit to 1 enables CRC calculations. PKTCFG1E bits 2..1 configure node address filtering:
PKTCFG1E bits 2..1
00
01
10
11
Node Address Filtering
no filtering
only node address accepted
node address and 0x00 accepted
node address, 0x00 and 0xFF accepted
Table 80
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? 2009-2010 by RF Monolithics, Inc.
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Page 59 of 65
TRC103 - 11/29/12
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