– 11 –

CXD2053AM/AS

6. Processing of EDTV-II ID and ID-1 data from the bus

EDTV-II ID

or ID-1

EDVLD or

VBVLD

Decoder

Data validity judgment

CXD2053AM/AS

Pin direct output

to microcomputer

As shown in the figure above, the data validity judgment and decoding results are obtained independently

during EDTV-II ID or ID-1 decoding. When outputting these results directly to pins, the results are output after

either by simply outputting this data directly to the pins or by taking the logical product (AND) as above.

In addition, performing the processing when the data validity judgment result (EDVLD or VBVLD) is 1 and the

decoding result is 0 allows video to be judged as 4:3 video. Even video which has had the top and bottom of

the screen blacked out due to picture composition intentions can be viewed as the original 4:3 video by giving

this judgment priority over the auto wide function.

7. Setting EDTV-II ID decoding function

bus or bus-free mode.

Setting

Resistance to ghosting

Resistance to weak

electric fields

ED2FSC = 0

EDDEC2 bit3 = 0, bit2 = 1

SCL (15pin) = Low

SDA (16pin) = Low

Medium

Medium

ED2FSC = 0

EDDEC2 bit3 = 1, bit2 = 0

SCL (15pin) = High

SDA (16pin) = Low

Strong

Medium

ED2FSC = 1

EDDEC2 bit3 = 1, bit2 = 0

SCL (15pin) = High

SDA (15pin) = High

Strong

Strong

Table 5. EDTV-II ID decoding function switching

ED2FSC is originally a function which stops the 3.58MHz amplitude check for the Y signal input from the S

terminal, etc. However, it can also be used in combination with the EDDEC2 setting to increase the resistance

to ghosting and weak electric fields as shown in the table above. EDDEC2 is the luminance check level

switching during the 3.58MHz or 2.04MHz confirmation signal interval.

Similarly, although EDDEC1 is the 2.04MHz amplitude check level switching, it should be set to bit 5 = 0 and

bit 4 = 1.

Since EDTV-II ID identification for this IC is simple identification, increasing the resistance to weak electric

fields, etc. results in a tradeoff which increases the possibility of misoperation. Accordingly, the leftmost

settings in the table above should be used as the standard settings, and other settings used only when

necessary.