Z8623012SSG Datasheet, PDF (27/61 Pages) Zilog, Inc. – ADVANCED PROGRAM BLOCKING AND NTSC LINE 21 XDS DECODER

REGISTERS SUMMARY
CONTROL REGISTERS
TABLE 15. XDS SECONDARY FILTER SETTINGS
Secondary Filter
Filter Value (s0:s2)
All
0h
Time Information
1h
In Band Only
2h
Content Advisory
3h
VCR Information
4h
Reserved
5h
Reserved
6h
Reserved
7h
Notes:
1. Setting this register to 00h turns XDS data recovery off. Setting bits D₀
through D₄ enables XDS data recovery for the Classes selected as qualified by
the Secondary Filter (bits D₅–D₇). If Bits D₀–D₄ are all set to 1, all Classes of
XDS data are output (even Reserved and Undefined).
2. The Time Information Only selection includes the Time of Day (TOD) and Local
Time Zone (LTZ) packets.
3. VCR Information selects TOD, LTZ, Net ID, Local Call Letters, Impulse Capture,
Tape Delay, Composite 2, and Out-of-Band Channel Number packets for recovery.
6.1.5 Interrupt Request Register
TABLE 16. INTERRUPT REQUEST REGISTER (ADDRESS = 06h)
Bit
7
6
5
4
3
2
1
0
res res dXDS res dLOK EOF DLE res
R/W
R/W R/W R/W R/W R/W R
R
—
D₀-Res. Reserved.
D₁-DLE. Active High, indicating that the data line has ended. This bit sets two
lines after the data line, and clears about 20 lines before the end of the field.
D₂–EOF. Active High, indicating that the video signal is currently at the end of a
field. This bit sets during line 262 in Field 1 and line 524 in Field 2. This bit clears
about 2 lines before the end of the field.
D₃–dLOK. Active High, indicating that the state of the LOCK signal has changed.
The SSR must be read to determine the current state.
D₄-Res. Reserved.
D₅–dXDS. Active High, indicating that a change in XDS activity has occurred.
The Line 21 Activity Register must be read to determine if XDS data is active.
D₆-D₇-Res. Reserved.
NOTE: Except as noted for the case of D1 and D2 above, the master device must write a 1
to the appropriate bit in the Interrupt Request Register to clear the Interrupt. Writing a 1 to
PS000401-TVC0699
Z86230—PRELIMINARY
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