MSM7583 Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7583

π/4 Shift QPSK MODEM

Oki Electric Industry 

¡ Semiconductor

MSM7583

RXSEL

Receive data, receive clock, and receive symbol clock select signal.

If this pin is set to "0", the output levels of Channel 1 RXD1, RXC1, and RXSC1 are selected to

be output to RXD0, RXC0, and RXSC0. If this pin is set to "1", the output levels of Channel 2

RXD2, RXC2, and RXSC2 are selected to be output to RXD0, RXC0, and RXSC0.

Note that a hazard may sometime occur in RXDO, RXCO, and RXSCO because RXSEL selects

asynchronously.

RPR1, RPR2

High-speed phase clock control signal input pin for the clock recovery circuit.

When each of the pins is “1”, the clock recovery circuit starts in the high-speed phase clock

mode. When the phase difference is less than a defined value, the circuit shifts to the low-speed

phase clock mode automatically. When each of the pins is “0”, the circuit is always in the low-

speed phase clock mode. RPR1 is for Channel 1, and RPR2 for Channel 2.

AFC1, AFC2

AFC operation range specification signal inputs.

As shown in Fig. 4, the AFC information is reset when both AFC and RPR are set to “1”. AFC

operation starts at a certain period after the AFC information is reset. When RPR is set to “1”,

an average number of times that AFC sets to on is low. When RPR is “0”, it is high. When AFC

is “0”, frequency error is not calculated, but the frequency is corrected using an error that is

held. AFC1 is for Channel 1, and AFC2 for Channel 2.

RCW1, RCW2

Clock recovery circuit operation ON/OFF control signal inputs.

When this pin is “0”, DPLL does not make any phase corrections. RCW1 is for Channel 1, and

RCW2 for Channel 2.

(CASE1)

AFC

RPR

(CASE2)

AFC

RPR

Average number of times

AFC information Average

AFC is high.

is reset.

number of times

AFC is low.

“0”

Average number of times

The clock recovery

AFC is high.

circuit starts with the previous

AFC information.

Figure 4 AFC Control Timing Diagram

AFC information

is maintained.

AFC information

is maintained.

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