MT312CSLASHCG datasheet(43/90 Pages) ZARLINK

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QPSK Demodulator

MT312

B3:

Reserved High = QPSK FR UNLOCK

B2:

High = QPSK calculation complete

B1:

High = QPSK TS MAX

B0:

High = QPSK CS MAX

Reading an Interrupt register resets that register.

The majority of these interrupts are for diagnostic purposes and generally not useful in normal operation,

unless otherwise indicated.

B7:

High = QPSK state change

B6:

High = QPSK frequency end of search rangeimportant indicator.

B5:

High = QPSK BAUD end of rangeimportant indicator.

B4:

High = QPSK AFC success

B3:

High = QPSK AFC fail

B2:

High = QPSK next frequency search

B1:

High = QPSK same frequency search

B0:

High = QPSK LTV limit

Reading an Interrupt register resets that register.

Frequency and symbol rate search is carried out as follows. If the symbol rate is known then MT312 will search

the speciﬁed frequency range for this symbol rate. Once the end of this range has been reached, "QPSK end of

frequency range search" interrupt will be issued and MT312 will resume the search beginning from frequency

zero. A "QPSK end of Symbol rate range(s) search" interrupt will not be issued.

If the symbol rate is not known, then MT312 can be made to search several sub-ranges of symbol rates, by

setting 12 bits of the pair of SYM RATE registers, as described in section 4.4. For illustration purposes, assume

that the symbol rate sub-ranges SYS CLK/2 to SYS CLK/3 and SYS CLK/4 to SYS CLK/6 are to be searched.

Then MT312 will begin the search from the upper sub-range SYS CLK/2 to SYS CLK/3. MT312 will search for

a channel with a symbol rate in this range over the speciﬁed frequency range, for example ± 10 MHz. If no

channel is found then MT312 will issue a "QPSK end of frequency range search" interrupt and will go on to

search the sub-range SYS CLK/4 to SYS CLK/6 over the speciﬁed frequency range. If no channel is found,

then MT312 will issue a "QPSK end of frequency range search" interrupt as well as a "QPSK end of Symbol

rate range(s) search" interrupt. Then MT312 will return to search the speciﬁed frequency range for a symbol

rate in the range SYS CLK/2 to SYS CLK/3. This process continues indeﬁnitely, unless it is interrupted by host

processor software.

NAME

ADR

Def

hex

QPSK INT L

QPSK INT [7:0] Interrupt QPSK (low byte)

MT312C/CG Datasheet(PDF) 43 Page - Zarlink Semiconductor Inc

MT312C/CG Datasheet(HTML) 43 Page - Zarlink Semiconductor Inc

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