PRELIMINARY DATA SHEET
MAS 3507D
2.8. Start-up Configuration
Table 2–8: Start-up configuration1)
Basic operation of the MAS 3507D is possible without
controller interaction. Configuration and the most
important status information are available by the PIO
interface. The start-up configuration is selected
according to the levels of several PIO pins. The levels
should be set via high impedance resistors (for exam-
ple 10 kΩ) to VSS or VDD and will be copied into the
StartupConfig register directly after power up / reset.
After start-up, the PIO will be reconfigured as output.
PIO
Pin
“0”
“1”
PI8
divide CLKO by 1,
2, or 4 (according
to MPEG 1, 2, or
2.5)
CLKO fixed at
24.576 or
22.5792 MHz
PI4
SDI input mode
PIO-DMA input
mode
To enable greater flexibility, it is possible to configure
the MAS 3507D without using the PIO pins or to recon-
figure the IC after start-up. The procedure for this is to
send two I2C commands to the MAS 3507D:
PI3
PI2
PI1
PI0
Enable layer 3
Disable layer 3
Disable layer 2
SDO output: 16 bit
Enable layer 2
– Writing the StartupConfig register (see Section 3.6.
on page 26)
SDO output: 32 bit
– Execute a ‘run $0fcd’ command (see
Section 3.3.1.).
input: Multimedia
mode (PLL off)
input: Broadcast
mode (PLL on)
The configuration will be active up to a reset. Then, the
new configuration will be loaded again via PIO.
1) Start-up setting can be changed by I2C commands
after reset.
2.8.1. Parallel Input Output Interface (PIO)
During start-up, the PIO will read the start-up configu-
ration. This is to define the environment for the
MAS 3507D. The following pins must be connected via
resistors to VSS or VDD:
Micronas
15
MICRONAS [ MICRONAS ]
