Z8622912SSC Zilog, Z8622912SSC Datasheet - Page 34

• Manufacturer Part Number: Z8622912SSC
• Description: IC CCD W/2ND I2C ADD 18-SOIC
• Manufacturer: Zilog
• Type: Video Decoderr

Specifications of Z8622912SSC

• Applications: Set-Top Boxes, TV
• Voltage - Supply, Digital: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 18-SOIC (7.5mm Width)
• Processor Series: Z8622x
• Core: Z80
• Data Bus Width: 8 bit
• Program Memory Size: 3.7 B
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 18
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply, Analog: -
• Lead Free Status / Rohs Status: No RoHS Version Available

+ 0 6 ' 4 0 # . 4 ' ) + 5 6 ' 4 5
Filtered XDS Data Format
Filtered XDS data is output from the Z86229 in the order
it is received on Line 21. The XDS filter function is essen-
tially creating a new, smaller stream of XDS data packets.
This new data stream looks exactly as though the Class and
Type specified in the XDS Filter Register (05h) are
data
from the Z86229 is in full compliance with EIA–608 spec-
ifications for XDS data streams (headers and control codes
intact). See the Note paragraph in the next column for a spe-
cial exception to this rule.
XDS data and header information (including START,
CONTINUE, and END commands) are passed through the
filter for the XDS class and type specified in the XDS Filter
Register. All other Line 21 data is filtered out. This data is
neither output nor used to generate a data available flag
(DAV) in the Serial Status Register.
To properly read filtered XDS data from the Z86229, the
master device must first write the XDS Filter Register (05h)
with its required XDS Class and Type information. For ex-
ample in Z86229, in order to extract ONLY the Line 21 Pro-
gram Rating information, the master must write the value
61h to the XDS Filter Register. The master should then poll
the state of the DAV bit in the SSR until DAV = 1.
As soon as DAV=1, the master may initiate a 3-byte read
in the normal manner (XDS data bytes always arrive in
pairs, so it is safe to assume that RD2=1 when DAV=1 in
the SSB). A 3-byte read always yields two data bytes, which
in this case is the first two bytes of the Current Class, Pro-
gram Rating Type XDS data stream encountered on Line21
field 2. The master device must then interpret those two
encoded on Line 21 of field 2. The filtered data output
% Q P V K P W G F
the only
bytes according to the EIA–608 specifications for Current
Class, Program Rating Type data. Refer to EIA–608 for data
formats.
The XDS filters on the Z86229 greatly reduce the amount
of field 2 data passed on to the master device for further pro-
cessing and interpretation; however, the master device must
still interpret the filtered data stream in accordance with
EIA–608. The filtered data stream from the Z86229 is in
full compliance with the EIA–608 specification. In other
words, the filtered data stream contains all the XDS com-
mand and data packets, in standard EIA–608 format, but
only for the selected XDS Class and Type(s).
Note:
The Z86229 XDS filter for Program Rating information
behaves differently than all other Z86229 predefined
XDS filters. This change has been made to minimize the
amount of data passed through the Program Rating XDS
filter, thereby minimizing the interpretation and commu-
nications load on the master device. When the XDS Filter
Register is set to 61h (Class=01h (Current), Type=05h
(Program Rating) is the only data from the Line 21 field 2
that passes through the filter.
1. Program Rating Packet: [xxh,xxh]. The Current Class
Program Rating data byte pair as defined in EIA–608.
The program’s rating is encoded per EIA–608 in the xxh
byte pair.
2. The END Packet [0Fh,CHKSUM]. A two-byte packet
that includes a CHKSUM computed per EIA–608. The
checksum calculation includes the START packet
[01h,05h], even though this value was not passed through
the filter.
ZiLOG