saa7118 NXP Semiconductors, saa7118 Datasheet - Page 62

• Manufacturer Part Number: saa7118
• Description: Multistandard Video Decoder With Adaptive Comb Filter And Component Video Input
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 15219
Product data sheet
8.6 Image port output formatter (subaddresses 84h to 87h)
Table 15:
The output interface consists of a FIFO for video and for sliced text data, an arbitration
circuit, which controls the mixed transfer of video and sliced text data over the I port and a
decoding and multiplexing unit, which generates the 8-bit or 16-bit wide output data
stream and the accompanied reference and supporting information.
The clock for the output interface can be derived from an internal clock, decoder,
expansion port, or an externally provided clock which is appropriate for e.g. VGA and
frame buffer. The clock can be up to 33 MHz. The scaler provides the following video
related timing reference events (signals), which are available on pins as defined by
subaddresses 84h and 85h:
The discontinuous data stream at the scaler output is accompanied by a data valid flag (or
data qualifier), or is transported via a gated clock. Clock cycles with invalid data on the
I port data bus (including the HPD pins in 16-bit output mode) are marked with code 00h.
The output interface also arbitrates the transfer between scaled video data and sliced text
data over the I port output.
The bits VITX1 and VITX0 (subaddress 86h) are used to control the arbitration.
As a further operation the serialization of the internal 32-bit Dwords to 8-bit or optional
16-bit output, as well as the insertion of the extended ITU 656 codes (SAV/EAV for video
data, ANC or SAV/EAV codes for sliced text data) are done here.
For handshake with the VGA controller, or other memory or bus interface circuitry,
programmable FIFO flags are provided; see
DT[3:0]
62h[3:0]
1101
1110
1111
•
•
•
•
•
•
•
Output field ID
Start and end of vertical active video range
Start and end of active video line
Data qualifier or gated clock
Actually activated programming page (if CONLH is used)
Threshold controlled FIFO filling flags (empty, full and filled)
Sliced data marker
Standard type
MOJI (Japanese)
Japanese format switch
(L20/22)
no sliced data transmitted
(video data selected)
Data types supported by the data slicer block
Rev. 06 — 22 December 2005
Multistandard video decoder with adaptive comb filter
Data rate
(Mbit/s)
5.7272
5
5
Section
Framing Code
(FC)
programmable
(A7h)
programmable
none
8.6.2.
…continued
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
FC window Hamming
Japtext
open
disable
SAA7118
check
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