參數(shù)資料
型號(hào)： SAA4951WP
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： Memory controller
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC44
封裝： PLASTIC, SOT-187-2, MO-047AC, LCC-44
文件頁(yè)數(shù)： 12/25頁(yè)
文件大?。?/td> 95K
代理商： SAA4951WP
April 1994
12
Philips Semiconductors
Preliminary specification
Memory controller
SAA4951
MODE1
0 (LSB)
1
2
3
DR
STPWM1
STPWM2
MC1
display raster
stop writing to memory 1: still picture mode
stop writing to memory 2: still picture mode
memory configuration bit 1
0: two field memories; 1: one field memory
golden scart
0: normal IPQ mode; 1: golden scart input
for external mode (13.5 MHz input clock) only:
0 = 50 Hz, 864 clock cycles per line; 1 = 60 Hz, 858 clock cycles per line
horizontal reference pulse BLNA and clock LLA from external source
0: internal (PLL); 1: external
vertical frequency select
VFS
DR
0
0
100 Hz (312.5 lines) ABAB raster
0
1
100 Hz (313/312.5/312/312.5 lines) AABB raster
1
0
50 Hz (625 lines) 1:1, non-interlaced
1
1
50 Hz (1250 lines) 2:1, interlaced
4
GSC
5
CCIR60
6
EXTLLA
7
VFS
display mode
REGISTER
BIT
NAME
REMARKS
Description of acquisition part
LLA
This is the main input clock pulse for the acquisition side of
the memory controller generated by an external PLL
circuit. Depending on the chosen system application LLA
runs on the different frequencies of 12/13.5/16/18 MHz.
The PLL circuit is controlled by the analog burst key pulse
ABK provided by an inserted synchronization circuit (i. e.
TDA2579) and the horizontal reference signal HRA
supplied by the SAA4951 circuit.
WEXT
External write enable input for digital colour decoder
applications, where the write enable signal is generated by
the digital colour decoder. This signal is simply sampled by
LLA and fed out at WE1.
SWC1
The acquisition clock input signal LLA is connected
through the memory controller circuit. LLA is internally
buffered and put out as serial write clock SWC1 for the
memory 1. Additionally SWC1 is used as a clock signal for
the three AD-converters and for the formatter function.
ALDUV/VB
The output signal ALDUV (analog load for the
chrominance signals U and V) controls the formation of the
8-bit digital data information of the chrominance signals U
and V.
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SAA4952WP Memory controller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA4952WP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Memory controller
SAA4955 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:2.9-Mbit field memory
SAA4955TJ 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:2.9-Mbit field memory
SAA4956TJ 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:2.9-Mbit field memory with noise reduction
SAA4960 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Integrated PAL comb filter
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