MC92314 Datasheet, PDF (53/100 Pages) Motorola, Inc – DVB-T Single Chip Demodulator Application Note

Freescale Semiconductor, Inc.
DVB-T Demodulator Interfaces
s 00011010 l 00000000 l
11110111 l
slave address is “0001101”
select register “00000000”
p
s 00011010 l 00000000 l
r 00011011 l hlhllhhh 0
LEGEND
s: start condition
write “11110111” into
register “00000000”
lllllllh 0
lllhlhhh 0
p: stop condition
r: restart
lllllllh 0
0: write “0”
read “10100111” from
register “00000000”
n _{read “00000001” from}
tio ^{register “00000001”}
a _{read “00010111” from}
register “00000010”
llllllll 0
llllllll 1
1: write “1”
l: read “0”
h: read “1”
(from master perspective)
form ^{Figure 4-5. Typical I2C Sequence}
In _{4.2.1.5.1 Defining I}²_{C Slave Address}
y ^{All I2C bus members must have different 7-Bit I2C addresses with the LSB defining the direction}
r _{of data transfer (0: master writes into slave; 1: master reads from slave). The selection of unique}
a _{addresses within the system is done by setting certain addressbits of the devices. The bits that}
in ^{can be set individually by the user are explained below.}
lim ^{4.2.1.6 I2C Interface of the MC92314}
Despite the device works with a supply voltage of 3.3 V it can be used without any modification
Pre ^{in an environment with a H-Level voltage of 5 V due to the 5 V tolerant I/O drivers implemented.}
Because 2 devices out of the 3-chip set use their own I²C controllers it was decided to implement
two different I²C addresses in the single chip demodulator to keep the necessary changes on the
control software as small as possible. Therefore the I2C registers of the OFDM block have a
different address than the registers of the FEC part.
The four lower bits of the MC92314 address can be programmed by the board designer
connecting the MBUSID[3..0] pins to VDD or VSS. The higher 3 bits are fixed to different patterns
for the OFDM and the FEC part.
OFDM Block I²C Slave Address
0
1
0 MBUSID3 MBUSID2 MBUSID1 MBUSID0
Single Chip DVB-T Demodulator - Rev. 1.3 (11/30/98)
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MOTOROLA
4-5