SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 51

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

Philips Semiconductors
18.1.6.6
If the TXT0.INV ON bit is a logic 1, memory block 8 is used
as an inventory page.The inventory page consists of two
tables: the Transmitted Page Table (TPT) and the Subtitle
Page Table (SPT).
In each table, every possible combination of the page tens
and units digit, 00H to FFH, is represented by a byte.
Each bit of these bytes corresponds to a magazine number
so each page number, from 100H to 8FFH, is represented
by a bit in the table.
2000 Feb 23
handbook, full pagewidth
Enhanced TV microcontrollers with
On-Screen Display (OSD)
Inventory page
Bytes in the table
row n
n + 1
n + 6
n + 7
bits in each byte
column
0
Fig.20 Transmitted/subtitle page organisation.
8
7xx
bit
7
6xx
5xx
16
4xx
51
The bit for a particular page in the TPT is set when a page
header is received for that page. The bit in the SPT is set
when a page header for the page is received which has the
‘subtitle’ page header control bit (C6) set. The bit for a
particular page in the TPT is set when a page header is
received for that page. The bit in the SPT is set when a
page header for the page is received which has the
‘subtitle’ page header control bit (C6) set.
3xx
24
2xx
1xx
8xx
0
32
Preliminary specification
MGD160
39
SAA55xx