GS9021 datasheet(18/26 Pages) GENNUM

18 / 26 page

521 - 65 - 05

Fig. 3 Data Latency through the GS9021

TABLE 2: GS9021 Case Table

MODE

CASE

NUMBER

R/T

CRC_MODE

EDH

PACKET

RESULTS

COMMENTS / SUGGESTIONS

TX MODE

No EDH comparison is performed.

A new EDH packet is inserted into

the data stream with all the EDH

flags cleared unless overwritten by

the dedicated flag port or the host

interface. The EDH packet will

include CRC values calculated

from the data stream.

Use this MODE if you wish to

insert EDH if it is not present. If

EDH is present, clear all flags and

update CRC.

YES

CRC MODE

Same results as Case #1

Use this MODE on the output EDH

chip when mapping flags from an

input EDH chip around a

processing core (which would

alter the picture data) to an output

EDH chip so that EDH errors are

not generated. You can also use

this mode when you simply want

to update the CRC values after

processing, if the processing

does not corrupt the EDH packet.

In both cases, the EDH flags are

preserved.

YES

No EDH comparison is performed

(i.e. no attempt is made to detect

errors). The CRC is updated and

all flags preserved or unaltered

unless overwritten by the

dedicated flag port or host

interface.

RX MODE

New EDH packet inserted into

data stream with all error flags

cleared and all UES flags set high

unless overwritten by the

dedicated flag port or the host

interface.

Use this MODE when you wish to

detect errors in the data stream,

or on an input EDH chip when

mapping flags around a

processing core (that would alter

the picture data) to an output EDH

chip so that EDH errors are not

generated due to the data

processing.

YES

EDH comparison performed and

error flags set and mapped

appropriately unless overwritten

by the dedicated flag port or the

host interface. The CRC is

updated and the EDH packet is re-

inserted.

Use this MODE when you want to

insert EDH if it is not present or

update CRC values and preserve

the flags in an existing EDH

packet.

NOTE

1. “X” in the table above means ‘don’t care’ (but not left floating).

DIN [9:0]

PCLK IN

DOUT [9:0]

tLAT

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