SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 50

• Manufacturer Part Number: SAA5531
• Description: Enhanced TV microcontrollers with On-Screen Display OSD
• Manufacturer: Philips Semiconductors

Philips Semiconductors
18.1.6.5
The Hamming error flags are set if the on-board 8/4
Hamming checker detects that there has been an
uncorrectable (2-bit) error in the associated byte. It is
possible for the page to still be acquired if some of the
page address information contains uncorrectable errors if
that part of the page request was a ‘Don’t Care’. There is
no error flag for the magazine number as an uncorrectable
error in this information prevents the page being acquired.
The interrupt sequence (C9) bit is automatically dealt with
by the acquisition section so that rolling headers do not
contain a discontinuity in the page number sequence.
Table 15 The data in row 25 of the basic page memory
2000 Feb 23
10 to 23
Enhanced TV microcontrollers with
On-Screen Display (OSD)
COL
0
1
2
3
4
5
6
7
8
9
Row 25 data contents
BIT 7
0
0
0
0
0
0
0
0
0
0
BIT 6
0
0
0
0
0
0
0
0
0
0
PBLF
BIT 5
0
0
0
0
0
0
0
0
0
Hamming error
Hamming error
Hamming error
Hamming error
Hamming error
Hamming error
Hamming error
Hamming error
FOUND
0
unused
BIT 4
50
The magazine serial (C11) bit indicates whether the
transmission is a serial or a parallel magazine
transmission. This affects the way the acquisition section
operates and is dealt with automatically.
The newsflash (C5), subtitle (C6), suppress header (C7),
inhibit display (C10) and language control (C12 to 14) bits
are dealt with automatically by the display section.
The update (C8) bit has no effect on the hardware.
The remaining 32 bytes of the page header are parity
checked and written into columns 8 to 39 of row 0. Bytes
which pass the parity check have the MSB set to a logic 0
and are written into page memory. Bytes with parity errors
are not written into the memory.
PU3
PT3
MU3
C4
HU3
C6
C10
C14
0
0
BIT 3
PU2
PT2
MU2
MT2
HU2
C5
C9
C13
MAG2
0
BIT 2
Preliminary specification
PU1
PT1
MU1
MT1
HU1
HT1
C8
C12
MAG1
0
BIT 1
SAA55xx
PU0
PT0
MU0
MT0
HU0
HT0
C7
C11
MAG0
0
BIT 0