Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
9.4
Input/Output (I/O)
9.4.1
Introduction
•
There is no automatic detection for the presence of a
source. All sources should be accessed via a “connect”
command via Remote Control.
•
The monitor out signal is always “frontend out”, no matter
what the source is.
9.4.2
Input detection
The RGB or YPbPr input signals (2fH/3fH) are sent to the ADC
(AD9883A) together with H and V pulses from the DVI input,
and the Y signal from YPbPr called Sync On Green (green is
same line as Y).
The AD converter:
•
Detects via H and V sync, if RGB is present or not.
•
Detects via Sync On Green, if YPbPr is present or not.
•
Detects the selected sync.
•
Selects the sync switch via I2C.
•
Does AD conversion to 848 samples per line, 8 bits in 422
format. This means one bus for Y signal with 8 bits and one
bus for UV with 4 U and 4 V bits. Depending on the system
detected by EBILD, the sample frequency is changed.
Note:
When a 1fH input is detected, the AD converter is set in
tristate.
1fH input flow
Figure 9-6 Flowchart 1fH detection
1.
If a 1fH selection is done (except for AV4), the sound is
muted and the picture is blanked.
2.
The ADC is powered down.
3.
The PICNIC is not in free run.
4.
Both FBX and EBILD are set in 1fH (see lookup table
further on).
5.
Sound is demuted and picture is unblanked.
2fH/3fH input flow
Figure 9-7 Flowchart 2fH/3fH detection
1.
The standard detection starts with a 2fH/3fH selection
(AV4 or AV5).
2.
The ADC is full powered (it was powered down in 1fH).
3.
The sound is muted and the picture is blanked.
4.
On AV4, a 1fH and 2fH/3fH signal can enter. The HIP does
this detection. When 1fH is detected, the FBX is set to 1fH,
the PICNIC is not in free run, the picture is unblanked, and
the sound is demuted. The set is in 1fH state. This state is
continues checked, because the input can change from
1fH to 2fH/3fH.
5.
If the input is 2fH/3fH, the PICNIC is set to free run.
6.
The ADC is set to the last status from this selected input,
because there is a big chance that the same standard is
wanted.
7.
The number of samples per line and lines per field is
collected from the EBILD. The check is done three times. If
the same value is measured within some tolerances (see
lookup table) the standard is valid. The time between two
measurements must be at least one frame or 20 ms.
8.
If the ADC has not the right settings, the PLL does not lock,
and the "STDET" measurements do not give the same
results. The ADC is set to its default value; this value is able
to catch all supported standards. If the ADC is already in
the default value and no standard detection is possible, the
set changes to blue mute.
CL 36532053_080.eps
170703
Put PICNIC: freerun OFF
Put ADC: power down
START
1Fh selection
Demute sound, Unblank picture
1FH
Set FBX, see lookup table
Set EBILD, see lookup table
Mute sound, Blank picture
CL 36532053_079.eps
160703
Put picnic: freerun ON
Mute sound, Blank picture
AV4 on US ?
Put ADC on last status from select. input
get Ebild: sam ples/line, lines/field=STDET1
get Ebild: sam ples/line, lines/field=STDET2
wait >20 m sec
wait >20 m sec
get Ebild: sam ples/line, lines/field=STDET3
STDET1=2=3?
Supp standard ?
sam e standard as last status?
Put ADC: full power
no
yes
yes
no
Put picnic to 1FH
Set ADC to default value
yes
wait 200 msec
1Fh detection in HIP?
yes
yes
no
Unblank, dem ute
Put picnic: freerun OFF
START
Selection
AV5 or AV6 Eur
AV4 or AV5 US
ADC to default value ?
no
yes
no
no
Set ADC, see tookup table
get Ebild: sam ples/line, lines/field=STDET1
get Ebild: sam ples/line, lines/field=STDET2
wait >20 m sec
wait >20 m sec
get Ebild: sam ples/line, lines/field=STDET3
STDET1=2=3?
yes
OSD: Message
no
Supp standard ?
no
yes
wait >20 m sec
Store standard as last status selected input
set Ebild: blue mute
Set FBX, see lookup table
Set EBILD, see lookup table
Unblank, demute
wait: 200 msec
FTL13U_AA_AB_312278513481.book Page 143 Thursday, December 30, 2004 1:50 PM
