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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 179K |
| 代理商： | MSM7730 |
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– s MSM7730 s
5
Oki Semiconductor
Radio Interface
The radio interface supports simple, flexible control of the radio and its synthesizer. The control signal
timing is programmable by the processor. Figure 3 shows the connection to a typical radio architecture.
The MSM7730 uses the RXC1 and TXC[1:0] pins to control radio timing. The delay between these signals
is programmable to support different radio designs.
The MSM7730 provides a 24-bit serial programming interface that supports the Seimens PMB2306T and
Philips UMA1020N synthesizers. The synthesizer interface is controlled through the use of an on-chip
synthesizer register.
The MSM7730 provides a hardware controlled serial DAC interface that is not accessible through any
MSM7730 registers. Because the synthesizer and EEPROM share the same clock and data lines, software
is responsible for ensuring that the PHY module is disabled when either of these modules is accessed.
At the start of each transmit packet, one of the four power levels is selected from the on-chip power con-
trol register according to the transmit power level requested by the control word of that packet. During a
receive operation, the serial DAC is used together with an external comparator for RSSI thresholds and
successive approximation measurement. The RSSIA threshold is loaded whenever the receiver is first
powered on. Once the RSSIA threshold is exceeded, the demodulator is accessed and the RSSIB, RSSIC,
and RSSID thresholds are loaded sequentially during each antenna scan. Once antenna scanning has
completed, a successive approximation is started.
Figure 3. Typical FH Radio Interface
RADPWR
RXC1
SLICE
RXD
RSSITH
DACEN
LKDET
SYNCLK
SYNDAT
SYNLEN
IFD[5:0]
TXC1
TXC2
ANT
Diversity
Switching
T/R
Switch
Disc
-
+
D
CSN
DAC
1LO
2LO
DAC
LNA
PA
Radio
MSM7730
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