SAA7146AH/V4,557 NXP Semiconductors, SAA7146AH/V4,557 Datasheet - Page 72
![IC VIDEO SPCI BRIDGE HP 160-QFP](/photos/6/89/68971/568-160-qfp_sot322-2_sml.jpg)
SAA7146AH/V4,557
Manufacturer Part Number
SAA7146AH/V4,557
Description
IC VIDEO SPCI BRIDGE HP 160-QFP
Manufacturer
NXP Semiconductors
Type
Video Bridger
Datasheet
1.SAA7146AHV4557.pdf
(139 pages)
Specifications of SAA7146AH/V4,557
Package / Case
160-QFP
Applications
DTV
Mounting Type
Surface Mount
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
568-1318
935269343557
SAA7146AHBB
935269343557
SAA7146AHBB
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SAA7146AH/V4,557
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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Philips Semiconductors
The PCI source data is defined by the base address
(BaseOdd3 and BaseEven3), the distance between the
start addresses of two consecutive lines of a field (Pitch3),
the number of lines per field of the source frame
(NumLines3) and the number of bytes per line of the
source frame (NumByte3). The programmer must provide
correct scaling settings to fulfil the target window
requirements. The pitch has to be Dword aligned.
7.10.2
The SAA7146A offers three different modes to support the
playback mode for various systems. The Binary Ratio
Scaler (BRS) inputs data from FIFO 3, therefore the DMA3
is in master read operation. The scaling result is passed to
the DD1 output.
The following sections describe the three different modes:
field memory mode, direct mode and line memory mode.
2004 Aug 25
handbook, full pagewidth
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
P
LAYBACK MODE
Fig.24 Sync and data path for field memory mode.
LLC
PXQ
READ
DMA
Dword request
DATA
reset
field
72
FIFO empty
DATA
7.10.2.1
In the field memory mode the SAA7146A takes a vertical
sync signal as a timing reference signal. A reset signal for
a field memory and a PXQ as write enable are generated
within the circuit and both are sent to port A or port B.
In this mode the pixel clock depends on the PCI load.
The pixels are provided to the DD1 port with maximum
1
vertical timing reference. Since the transfer works without
losing any data the pixel clock can be varied, therefore an
external field memory is needed at the DD1 interface.
The SAA7146A writes its data continuously to this
memory. The video window size depends on the selected
window size in the system memory, the frame buffer
(Numlines, Numbytes, pitch and base address) and the
selected scaling ratio.
2
VS
D1 INTERFACE
LLC (CCIR 656), the picture rate is restricted by the
FIFO3
DATA
BRS
PCI
Field memory mode
PXQ
(write enable)
MGG266
Product specification
SAA7146A
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