This is the main PCB with the PW338 handling the control of the entire unit,
as well as video processing. HDMI Rx & Tx functions are performed on this
PCB as well as video encoding & decoding.
IC200 is main PW338 micro/video processor. On sheet 4 the microprocessor
interface is shown. The PW338 has no internal boot code, so relies on code
in IC401 (39VF3201 FLASH) to run. IC401 is required to be pre-programmed
with at least boot code. If this part requires replacement, it *must* be
programmed with at least the boot code. If the FLASH is programmed with
the boot code, upon starting up, the PW338 will send out a boot loader
message on the RS232 port0 (sheet 3) at 115.2k baud, 8bits, no parity. If
there is a problem with the DDR memory (IC600 & IC601 sheet 6) there will
be a message sent along with the boot loader message. /AC present (low)
and Poweron_reset (high) from IC402 (LM809M-2.93 – resets the micro if
3V3_PW338 drops below 2.93V) are also required for the PW338 to start.
IC400 (74HC4040 divider) pre-divides the wordclock so the PW338 (EXINT0)
can measure the sampling frequency of incoming digital audio sources. RDS
Int (from L119) is connected to EXINT1 as the RDS data is streamed out of
the ALPS AM/FM module regardless of the readiness of the PW338.
IC403 is a quad UART to provide RS232 communication with the network
(L119), the Sirius satellite radio (L118) & iPod (L118). All signal labels are
with respect to the PW338.
Sheet 7 shows most of the connections to the daughter PCBs as well as the
I2C control busses:
EDID – used for the EDID dual port EEPROM (IC909, sheet 9)
AN – Analogue control bus, L116 Analogue input & L117 Analogue output
HDMI_Config – SiI9135 & SiI9134 x 2 & ADV7310 (sheet 5)
DAB – DAB module (L118) & system EEPROM (IC706 sheet 7)
3 x 74HC595 (IC701, IC703 & IC704) provide additional control output
signals.
The remaining control signals are on sheet 2. This sheet also shows the
interface between the SiI9135 HDMI receiver (IC201) and the PW338. The
audio outpus of IC201 go through L121 (Connection PCB) to L115 (Digital
IO).
Sheet 3 shows the analogue video inputs. There are separate inputs for
composite, S-video & component. The Y signal also is taken to a Sync input
on the PW338.
Sheet 5 is the video output port. The digital video port of the PW338 is
connected to the ADV7310 (IC501), SiI9134 (IC502) & SiI9134 (IC503). The
ADV7310 converts the digital video to analogue video outputs for component,
S-video & composite (depending on the resolution – up to 1080i for
component, 480i/576i only for composite & s-video). The two SiI9134 parts
convert the video data to HDMI serial data. While it is possible to have all
L122AY Main Board