SDA5523 Micronas Semiconductor, SDA5523 Datasheet - Page 17

• Manufacturer Part Number: SDA5523
• Description: SDA55xx TVText Pro
• Manufacturer: Micronas Semiconductor

DATA SHEET
That means if at least 855 Bytes (14767 Bytes in full
channel mode) are reserved for the VBI buffer size in
the RAM no VBI overflow will occur. The controller can
start or stop the VBI data acquisition using bit
‘ACQON’ of register STRVBI. The acquisition is
stopped as soon as this bit is changed to ‘0’. If the bit is
changed back to ‘1’ the acquisition starts again with
the next V-pulse (only if STAB = 1). The start address
(Bit 3 … 0 of register STRVBI) of the VBI buffer should
only be changed if the acquisition is switched off.
Fig. 2–3: VBI Buffer: General Structure
Micronas
STRVBI
VBI start line 6
Send to memory
Send to memory
Write to memory
after V-pulse
Send to slicer
after H-pulse
Send to slicer
after V-pulse
Send to slicer
after H-pulse
ACQFP0
ACQFP1
ACQFP2
ACQFP3
ACQFP4
ACQFP5
ACQFP6
ACQFP7
ACQFP8
ACQLP3
ACQLP4
ACQLP2
ACQLP3
ACQLP4
ACQLP0
ACQLP1
ACQLP2
ACQLP0
ACQLP1
7
Sept. 10, 2004; 6251-556-3DS
Field Status Information
Field Status Information
Field Status Information
Field Parameters
Field Parameters
Field Parameters
Field Parameters
Field Parameters
Field Parameters
Line Parameters
Line Parameters
Line Parameters
Line Parameters
Line Parameters
Line Parameters
Line Parameters
Line Parameters
Data Byte 41
Data Byte 0
Data Byte 2
Data Byte 1
Data Byte 1
Data Byte 2
Data Byte 41
Data Byte 0
Line Status
Line Status
And so on (until line 23 has been stored)
0
47 Byte
SDA 55xx
17