GS1532 Data Sheet
21498 - 6
June 2005
36 of 52
The registers available to the host interface for programming EDH calculation
ranges include active picture and full field line start and end positions for both
fields.
Table 3-8
shows the relevant registers, which default to '0' after device reset.
If any or all of these register values are zero, then the EDH CRC calculation ranges
will be determined from the flywheel generated H signal. The first active and full
field pixel will always be the first pixel after the SAV TRS code word. The last active
and full field pixel will always be the last pixel before the start of the EAV TRS code
words.
EDH error flags (EDH, EDA, IDH, IDA and UES) for ancillary data, full field and
active picture will also be inserted. These flags must be programmed into the
EDH_FLAG registers of the device by the application layer (
Table 3-9
).
NOTE 1: It is the responsibility of the user to ensure that the EDH flag registers are
updated once per field.
The prepared EDH packet will be inserted at the appropriate line of the video
stream according to RP165. The start pixel position of the inserted packet will be
based on the SAV position of that line such that the last byte of the EDH packet
(the checksum) will be placed in the sample immediately preceding the start of the
SAV TRS word.
NOTE 2: It is also the responsibility of the user to ensure that there is sufficient
space in the horizontal blanking interval for the EDH packet to be inserted.
Table 3-8: Host Interface Description for EDH Calculation Range Registers
Register Name
Bit
Name
Description
R/W
Default
AP_LINE_START_F0
Address: 012h
15-10
–
Not Used.
–
–
9-0
AP_LINE_START_F0[9:0]
Field 0 Active Picture start line data used to set
EDH calculation range outside of RP 165
values.
R/W
0
AP_LINE_END_F0
Address: 013h
15-10
–
Not Used.
–
–
9-0
AP_LINE_END_F0[9:0]
Field 0 Active Picture end line data used to set
EDH calculation range outside of RP 165
values.
R/W
0
AP_LINE_START_F1
Address: 014h
15-10
–
Not Used.
–
–
9-0
AP_LINE_START_F1[9:0]
Field 1 Active Picture start line data used to set
EDH calculation range outside of RP 165
values.
R/W
0
AP_LINE_END_F1
Address: 015h
15-10
–
Not Used.
–
–
9-0
AP_LINE_END_F1[9:0]
Field 1 Active Picture end line data used to set
EDH calculation range outside of RP 165
values.
R/W
0