Electronic Components Datasheet Search |
|
MSM7712 Datasheet(PDF) 12 Page - OKI electronic componets |
|
MSM7712 Datasheet(HTML) 12 Page - OKI electronic componets |
12 / 20 page s MSM7712 s ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 12 Oki Semiconductor MODEM Interface The MSM7712 provides FH PLPC framing and the FH modem as defined by the IEEE 802.11 specifica- tion.The radio synthesizer control pins are used for all modem options. A diagnostic port is provided when the internal modem is used. Several options are provided by the internal FH modem selected by the PHY_VER[MSEL] register bits. The following table shows the pin usage for various modem options. 1. All modem signals are synchronized to RCK. Modem Options and Pin Connections [1] Modem Interface FH Mbps (Low Cost) FH 1/2 Mbps (Normal ADC) FH 1/2 Mbps (Delta ADC) MSEL 1 2 3 IFD[] IFD[5:0] to TXIF DAC IFD[4] carries SLICE on RX IFD[5:0] to TXIF DAC and IFD[3:0] from RXADC IFD[5:0] to TXIF DAC (also used for Delta ADC) RXD Baseband RX data from radio Recovered data (Debug out) Input from Delta ADC comparator Modem Interface Signal Descriptions Pin Name Direction Description IFD[5:0] Bidirectional If MSEL=1 (low cost for 1Mbps modem), IFD[5:0] are used to drive a 6-bit DAC at 32 MHz to provide the mod- ulated transmit IF signal at 24 MHz. They are set to the DAC mid-value during receive. It is anticipated that a resistor ladder DAC will be used. If MSEL=2,3, (1/2 Mbps modem), IFD[5:0] are used to drive a 6-bit DAC at 32 MHz to provide the modulated transmit IF signal at 24 MHz. If MSEL=2 (1/2 Mbps modem, normal ADC) a 4-bit ADC (e.g. CA3304 type) provides digitized demodulated data at 16 MHz as input to the baseband controller on pins IFD[3:0] during receive. The ADC outputs must only be enabled during receive (e.g. by connecting RXC1 to the ADC output enable pin). If MSEL=3 (1/2 Mbps modem, delta ADC), a comparator is used to compare the value of the transmit IF DAC output to the receive demodulated signal, performing a tracing delta ADC function. The same 6-bit DAC (but at 16 MHz) is used on IFD[5:0] as during transmit, and the comparator input is connected to the RXD pin RIFD[5:0] Bidirectional With MSEL=2 (1/2 Mbps modem, normal ADC) a 4-bit ADC (e.g. CA 3304 type) provides digitized demodu- lated data at 16 MHz as input to the baseband controller on pins IFD (3:0) during receive. The ADC outputs must only be enabled during receive (e.g. by connecting RXC) to the ADC output enable pin. RXD Input When MSEL=1 (low-cost 1 Mbps modem), the RXD pin is used for baseband data input from a radio which has a built-in analog data slicer. The MSM7712 has a clock recovery circuitry to synchronize to the incoming data. The recovered clock is output on a diagnostic pin for test purposes. When MSEL=3 (1/2 Mbps modem, delta ADC), the delta comparator is input on this pin. The recovered clock from the demodulator is output on a diagnostic pin for test purposes. DIAG[6:0] Output Various signals are provided on these pins as diagnostic aids. The registers PHY_CTL[DIAG] and DEM_CTL0[DTST] select what signals are provided on these pins. |
Similar Part No. - MSM7712 |
|
Similar Description - MSM7712 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |