saa5233 NXP Semiconductors, saa5233 Datasheet - Page 12

• Manufacturer Part Number: saa5233
• Description: Dual Standard Decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Register 00:Control/Status (reset state XXX0 XX00)
Register 00 is split into two parts. The control part (WRITE only) consisting of bits D4, D1 and D0 and status part (READ
only) consisting of bits D7 to D5.
Table 6 Register 00.
Table 7 Register 00 bit description.
Table 8 Selection of Teletext packet 8/30/2 data or VPS data.
June 1994
IEL
ACQ 8/30/2
ACQ VPS
DSQ
8/30/2 RF
VPS RF
ACQ 8/30/2
Dual standard PDC decoder
SYMBOL
DSQ
D7
0
0
1
1
ACQ VPS
8/30/2 RF
BIT
D6
D4
D1
D0
D7
D6
D5
0
1
0
1
use automatic selection algorithm for line 16
acquire only VPS data on every VBI line
acquire only 8/30/2 data on every line 16
use automatic selection algorithm for line 16
Interrupt Error Level.
When logic 0, signal only completely valid data lines from Teletext packet 8/30/2
received and VPS received flags.
When logic 1, signal valid framing code and Teletext packet header 8/30/2 received or
valid start codeword for VPS received.
Acquire 8/30/2.
Acquire VPS.
Allows selective decoding of either Teletext packet 8/30/2 data or VPS data. If both are
set to the same value the system automatically selects the format being transmitted
(see Table 8).
Data Signal Quality.
When logic 1, good Teletext or VPS data signal is being received.
When logic 0, no Teletext or VPS data signal is being received.
8/30/2 Received Flag.
When logic 1, and IEL (D4) = logic 0 an error-free Teletext packet 8/30/2 has been
received, Hamming decoded and stored in the RAM. When logic 1, and IEL(D4) =
logic 1 a Teletext packet with a valid framing code and 8/30/2 header has been
received, Hamming decoded and stored in RAM.
When logic 0 no Teletext packet 8/30/2 data received.
VPS Received Flag.
When logic 1, and IEL(D4) = logic 0, an error-free VPS data line has been received,
biphase decoded and stored in the RAM. When logic 1, and IEL(D4) = logic 1 a VPS
data line with valid start code has been received, biphase decoded and stored in RAM.
When logic 0 no VPS data received.
VPS RF
D5
IEL
D4
12
D3
FUNCTION
FUNCTION
D2
ACQ 8/30/2
D1
Objective specification
SAA5233
ACQ VPS
D0