msm7583 Oki Semiconductor, msm7583 Datasheet - Page 9

• Manufacturer Part Number: msm7583
• Description: Shift Qpsk Modem
• Manufacturer: Oki Semiconductor

¡ Semiconductor
RXSEL
RPR1, RPR2
AFC1, AFC2
RCW1, RCW2
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.
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.
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.
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)
(CASE2)
AFC
RPR
AFC
RPR
AFC information
is reset.
The clock recovery
circuit starts with the previous
AFC information.
Figure 4 AFC Control Timing Diagram
Average
number of times
AFC is low.
Average number of times
AFC is high.
Average number of times
AFC is high.
“0”
AFC information
is maintained.
AFC information
is maintained.
MSM7583
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