參數(shù)資料
型號(hào)： MSM7730
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 2M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝： 20 X 20 MM, 0.50 PITCH, PLASTIC, LQFP-144
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 179K
代理商： MSM7730
s MSM7730 s –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
8
Oki Semiconductor
The MSM7730 supports two modes:
1-Mbps 2-ary FSK
2-Mbps 4-ary FSK
The demodulator offers three possible interfaces to a limiter/discriminator radio.
Analog data slicer (1Mbps only)
Post discriminator 4-bit ADC (offset binary)
Post discriminator 1-bit ADC (provisional)
The radio requirements for the demodulator are:
1 Mb: 20 dB S/N from discriminator 10-5 BER (802.11 specifies sensitivity of 10-5 for 80 dBm)
2 Mb: 30 dB S/N from discriminator 10-5 BER (802.11specifies sensitivity of 10-5 for 75 dBm)
Discriminator linearity of ±5% required for specified 2-Mbps operation
4-bit discriminator-to-ADC ranging, to cover approximately ±360 KHz
Carrier acquisition for analog slicer option within 4 s, yielding a duty cycle better than 60:40 for a
square wave (demodulation provides signal for carrier lock switch once preamble is detected
RSSI threshold decision within 4 s of antenna switching
3-state ADC output during transmit (bus is shared with TxDAC)
PHY Interface
The PHY section of the MSM7730 allows the MAC layers from two different stations to be interconnected
via a 2.4-GHz radio signal. Figure 6 shows a block diagram of the PHY interface.
The PHY provides a slow Frequency Hopping Spread Spectrum (FHSS) radio link at either 1 or 2 Mbps.
FH is performed over a subset of 1-MHz wide channels with a frequency band of 2.400 to 2.497 GHz. The
MSM7730 is not directly in control of the hopping sequence, but rather provides for reprogramming of
the radio channel so that this function can be managed under software control.
The mapping of data between the MAC and the radio link is called the Physical Layer Convergence Pro-
tocol (PLCP). This mapping involves the addition and removal of preamble and header information, as
well as the whitening and dewhitening of packet data. Figure 7 shows a block diagram of the PLCP.
MAC
RADIO
Radio
Control
Demodulator
Modulator
Figure 6. MSM7730 Physical Layer Block Diagram
Modem
Interface
Physical
Layer
Convergence
PHY Interface
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