U2739M-B Datasheet, PDF (16/69 Pages) ATMEL Corporation – DAB One-Chip Channel- and Source Decoder

U2739M-B
6.3 Tuner Interface
6.3.1 Tuner Interface Signal Description
QFP144 QFP100
27
19
28
20
Pin Name
W_AGC
SLI
Signal Description
Window AGC
0 during COFDM symbols
1 during the NULL symbol
Synchronization lock indicator
0 receiver synchronization not locked
1 receiver synchronization locked
Pad Type
PRO04T
PRO04T
Dir. 5 V Tol.
out
out
6.3.2 Tuner Interface Description
In order to implement a flexible AGC concept of a DAB
receiver the signals W_AGC and SLI can be used to
control the tuner IC U2731B. The influence of W_AGC
and SLI to the RF AGC voltage generation block is
described in the U2731B preliminary datasheet.
The WAGC signal must be controlled by the MC by using
the set WAGC configuration MC command. The WAGC
signal does not follow the moving FFT window. The
rising and falling edge can be adjusted by the MC. The
MC can use the differential dT, which correspond to the
FFT window shift, from the read synchronization status
command to adjust the WAGC rising and falling edge.
6.4 MC Interface
6.4.1 MC Interface Signal Description
QFP144 QFP100
Pin Name
72
50 MCM_TRIGGER
73
51 MC_MODE
74
52 MC_CLK
75
53 MC_DAT
Signal Description
MCM trigger signal
Microcontroller mode signal
0 I2C bus protocol
1 L3 bus protocol
Microcontroller clock signal
Microcontroller data signal
Pad Type
PRO04T
PDIZ
Dir. 5 V Tol.
out
in
x
PDIZ
in
x
PRB04TZ inout
x
6.4.2 MC Interface Description
The MC interface is used for data transmission between
the U2739M-B (slave) and an external microcontroller
(master). It can be configured for L3- or I2C protocol
depending on the status of the MC_MODE line during
reset (/RS = LOW):
MC_MODE = HIGH
V L3 bus selected
MC_MODE = LOW
V I2C bus selected
The MCM_TRIGGER line indicates the status of the
internal interface controller.
The external MCU is able to communicate with the
U2739M-B during LOW phases of MCM_TRIGGER
only !
Further the MCM trigger signal indicates the synchro-
nization status. If the MCM trigger has period of 8 ms,
then the U2739M-B is not locked. In the synchronized
(‘locked’) state the MCM trigger period correspond to the
CIF frame, which is provided every 24 ms. The complete
FIC is processed at the beginning of the transmission
frame.
16 (69)
Rev. A1, 22-May-01