GS9020A データシートの表示（PDF） - Gennum -> Semtech

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GS9020A

GENLINX ™II GS9020A Serial Digital Video Input Processor

Gennum -> Semtech 

For composite based standards, the V output signal is

asserted HIGH as described in the following table:

VBLANKS/L=1

NTSC

Composite

from Line 525/ Sample

768 to Line 9/ Sample

767 inclusive

AND

from Line 263/ Sample

313 to Line 272/

Sample 767 inclusive

VBLANKS/L=1

PAL

Composite

from Line 623/ Sample

382 to Line 5/ Sample

947 inclusive

AND

from Line 310/ Sample

948 to Line 317/

Sample 947 inclusive

VBLANKS/L=0

from Line 525/ Sample

768 to Line 19/ Sample

767 inclusive

AND

from Line 263/ Sample

313 to Line 282/

Sample 767 inclusive

VBLANKS/L=0

from Line 623/ Sample

382 to Line 15/ Sample

947 inclusive

AND

from Line 310/ Sample

948 to Line 327/

Sample 947 inclusive

2.3 TRS Errors

PIN

TRS_ERR

LOGIC OPR

HOST BIT

TRS_ERR

2.4 FIFO Reset Pulse

PIN

FIFOE/S

FIFO_RESET

LOGIC OPR

HOST BIT

The GS9020A also provides a FIFO_RESET pulse on the

FIFO_RESET output pin. This pin is always HIGH except

when the TRSID word is exiting the device as shown in

Figure 9. For component standards, a FIFOE/S input pin is

used to determine if the FIFO_RESET pulse occurs during

the EAV or SAV word of the outgoing data.

If FIFOE/S is HIGH, the active low pulse of the FIFO_RESET

output pin occurs during the EAV word. If FIFOE/S is LOW,

the active low output pulse occurs during the SAV word. For

composite signals the FIFOE/S pin has no effect since there

is only one TRS-ID word per line. This feature is useful for

synchronizing line store FIFOs that follow the GS9020A.

3. EDH PROCESSING BLOCK

This section describes the GS9020A’s EDH features and

functionality.

3.1 Error Flags

The flywheel is used to indicate TRS errors. These errors

are detected by comparing the TRS in the incoming data

stream with the expected TRS based on the internal

flywheel. If a mismatch occurs, the TRS_ERR signal is

immediately set HIGH and maintained HIGH until a correct

TRS occurs. The types of TRS errors detected are:

• TRS missing

• TRS in wrong location

• TRS-ID is different from the one generated by the

flywheel

The TRS_ERR signal is available as an output pin and via

the HOSTIF read table. The TRS_ERR signal should only be

considered valid if the flywheel is enabled.

PIN

LOGIC OPR

HOST BIT

INCOMING ERROR FLAGS

OUTGOING ERROR FLAGS

STICKY IN

STICKY OUT

OVERWRITE VALUES

OVERWRITE CONTROL

RO_CTRL

RESERVED WORDS (INCOMING)

RESERVED WORDS (OUTGOING)

All 15 EDH error flags can be read from the HOSTIF read

table. The INCOMING ERROR FLAGS represent the EDH

error flags present in the incoming EDH packet. The

OUTGOING ERROR FLAGS represent the EDH error flags

present in the outgoing EDH packet (after modification by

the GS9020A). Please note that the EDH flags can also be

accessed using the flag port as described later.

The INCOMING and OUTGOING ERROR FLAGS, the

incoming Validity bits (FFV and APV), and the EDH_CHKSM

bit can be made "sticky".

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