.
In the default mode, the eZSelect Z86130/Z86230 is designed to decode program rating and Extended Data
Services (XDS) data in the Vertical Blanking Interval (VBI) of Line 21. However, the Z86130/Z86230 can also
recover all the data packets in both fields of Line 21 by issuing the {3A} and {3B} commands, which are
described in the following table. The data recovered from Line 21 is fully compliant with EIA-608A and EIA-
744A, including V-Chip data packets, Closed Caption data, and XDS data.
.
After setting the Z86130/Z86230 to the Normal Decode mode and enabling Line 21 data recovery, the data
pairs are loaded into the serial output registers of the Z86130/Z86230 immediately upon receiving the valid
data packets in Line 21. The DAV (D6) and RD2 (D5) bits of the serial status register (SSR) go High (“1”),
indicating the availability of the two output bytes. Following a successful indication by the SSR, the external
TV processor or main microcontroller can directly read two bytes of data. The external TV processor can read
these data bytes without sending a READ SELECT command. For more details, see the following example.
#
This example assumes that the external main microcontroller is an I
communicates with the Z86130/Z86230 I
// After Power-On Reset (POR)
// During Initialization
UP000502-0601
9 4 + 6 ' % Q O O C P F ( W P E V K Q P
{3A}
{3B}
+ 0 '
+ 0 '
0
&
'
&
: # / 2 . ' 1 (
{28h, 3Bh}
{28h, FBh}
# 6 #
# 6 #
ZiLOG Worldwide Headquarters • 910 E. Hamilton Avenue • Campbell, CA 95008
4
' % 1 8 ' 4 ;
.
.
Telephone: 408.558.8500 • Fax: 408.558.8300 • Internet:
4
Recovers Line 21 data from both Field 1 and Field 2.
Sets the part to the Normal Decode mode. The Normal Decode mode decodes any data
that is fully compliant with EIA-608A and EIA-744A in both fields of Line 21.
' % 1 8 ' 4 ;
*
Note: By sending the {3B} command, the Z86130/Z86230 acts as a general Line 21 decoder.
To use all the V-Chip decoding features described in the specifications, the external TV pro-
cessor must send the RESET {FB} command, which resets the part to the V-Chip Decode
mode. This is the default mode.
1 9 6 1
%
1 / / # 0 & 5
4
' % 1 8 ' 4
// 28h is the Z86130/Z86230 I2C write address.
// The main microcontroller sends the FBh
// command to reset the Z86130/Z86230.
// The 3Bh command sets the Z86130/Z86230 to the
// Normal Decode mode. The Z86130/Z86230 becomes
// a general Line 21 decoder.
2
C slave device using the two-wire I
.
+ 0 '
&
P
FOR THE E
Z86230 P
NTSC Line 21 Decoder
RODUCT
# 6 #
2
RODUCT
C master. The master microcontroller
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C protocol.
S
I
NFORMATION
Z86130
PECIFICATIONS
AND