saa5250 NXP Semiconductors, saa5250 Datasheet - Page 17

• Manufacturer Part Number: saa5250
• Description: Interface For Data Acquisition And Control For Multi-standard Teletext Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 20 Magazine and row address group processing results
Without prefix
All the data following the framing code are stored in the FIFO memory.
Table 21 Prefix processing
Note
1. after page/flag detection
2. A1, A2, A3 are channel numbers
January 1987
D7
A/R
PREFIXES
DIDON
long
DIDON
medium
DIDON
short
NABTS
U.K.
teletext
without
prefix
Interface for data acquisition and control
(for multi-standard teletext systems)
CI = continuity index
F = format
PS = packet structure
D = data
MRAG = magazine and row address group
D6
X
CONSTRUCTION
OF PREFIXES
A1, A2, A3,
CI, F and D
A1, A2 and D
A1, F and D
A1, A2, A3
CI, PS and D
MRAG and D
D5
X
D4
RW4
BYTES STORED IN FIFO
MEMORY DURING SLOW MODE
CI, F and D
D
F and D
CI, PS and D
MRAG and D
all bytes of the data packet following the framing code are written into the
FIFO memory
D3
RW3
17
D2
RW2
D1
RW1
BYTES STORED IN FIFO
MEMORY DURING FAST MODE
CI
D
F
CI
MRAG
(1)
(1)
D0
RW0
(1)
(1)
and D
, PS
, F
(1)
(1)
(1)
and D
(1)
and D
and D
(1)
Product specification
(1)
(1)
SAA5250