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| 型號： | SAA7206 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | DVB compliant descrambler |
| 中文描述： | 兼容DVB解擾器 |
| 文件頁數(shù)： | 17/52頁 |
| 文件大小： | 193K |
| 代理商： | SAA7206 |
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1996 Oct 09
17
Philips Semiconductors
Product specification
DVB compliant descrambler
SAA7206H
Fig.10 Descrambler, register organization
(see Table 10).
(1) See Table 7.
(2) See Table 8.
handbook, halfpage
MGG322
if 0, registers are addressed,
if >0, buffers are addressed
register unit number, range 0 to 3
individual register addresses,
range depending on the unit
number
0 x H H H H
(1)
(2)
Table 7
Buffer contents
Table 8
Unit contents
BUFFER NUMBER
BUFFER CONTENTS
1
2
3
CW bank
CA data buffers for filters 0 to 15
CA data buffers for filters
16 and 17
REGISTER UNIT
NUMBER
UNIT CONTENTS
0
1
2
3
interrupt request handling control
parser input control
PID filter bank control
CA filtering control
Table 9
Specification of the number of CA_data_bytes which can be used for address filtering in the three types of
filters in the CA filter module (all bits in the filter can be masked individually)
FILTER NUMBER
NUMBER OF FILTERS
FILTER LENGTH (BYTES)
PID MASKABLE
Filters 0 to 15
Filters 16 and 17
(DVB compliant)
16
2
7
17
no
yes
The filter consists of 18 section detectors. Each section
detector selects and retrieves section data for
CA_messages on the basis of:
PID; which is maskable only for filters 16 and 17
Table_id; which is maskable for all filters
For filters 0 to 15; the first 7 bytes in the section payload,
which are maskable for all filters (see Fig.4)
For filters 16 and 17; the first 17 bytes in the section
payload, which are maskable
For all filters (see Fig.4).
The CA data detected by a certain filter is stored in the
256 byte buffer, only if its buffer is empty. As soon as an
entire section of CA data is stored, an interrupt is
generated (see Table 10, address 0x0000).
The 18 section detectors can be separately enabled, to
avoid unnecessary interrupts. The ‘filter fired’ registers
enable the microcontroller to track which filter caused a
buffer to be loaded (see Table 10, addresses 0x0300 and
0x0301).
The maximum section length of a conditional access
message is 256 bytes. If the section length of a message
is higher, data acquisition into the buffer is stopped after
256 bytes and an interrupt signal (plus filter fired signal) is
generated as normal. In this (erroneous) situation the
‘section_to_long’ bit of the filter is also set, which can be
read by the microcontroller (see Table 10).
The CA filters allow retrieval of multiple consecutive CA
messages, even if these messages have identical
selection criteria. For this purpose the 18 filters are
grouped in 9 filter pairs (0 and 1, 2 and 3 to 16 and 17).
Each of the CA filters in a pair can be programmed
equivalently. To prevent two filters from firing at the same
time the ‘equal conditions’ bits of the appropriate filter pair
can be programmed to logic 1. As a result, the filter with
the even (equals lowest) index number (for instance
filter_8 of filter pair 8 and 9) fires at the first occurrence of
a matching section. If, at the time of the second occurrence
of a matching section, the buffer of the filter with the even
index number is still occupied, the other filter (with odd
index number) of a filter pair fires, thus storing the section
data in its buffer.
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