al422 b 3m - bit frame buffer applications multimedia systems video capture systems video editing systems scan rate converters tv?s picture in picture feature anti - skip cd players description the al422 b is a first - in - first - output (fifo) video frame memory used to buffer audio/video/graphic data for digital processing, timing correction, or format conversion. it is manufa ctured with state - of - the - art embedded memory technology for applications in tvs, vcrs, scan converters, and digital video systems. ordering information part number package power supply AL422B 28 - pin plastic sop +3.3 volt features 384k (393,216) x 8 bits fifo organization supports vga and ccir resolutions independent read/write operations (different i/o data rates acceptable) high speed independent 8 - bit data i/o port operations maximum operating speed grade: 50mhz access time: 15 ns output enable control (data skipping) 3. 3v power supply with 5v signal input tolerant standard 28 - pin sop package 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 di0 di1 di2 di3 /we gnd tst /wrst wck vdd di4 di5 di6 di7 do0 do1 do2 do3 /re gnd /oe /rrst rck dec do4 do5 do6 do7 AL422B al422-04 422b pinout diagram
a ver l ogic t echnologies , i nc . tel : 1 408 361 - 0400 e - mail: sales@averlogic.com url: www.averlogic.com february 28, 2002 the al422 b consis ts of 3mbits of memory, and is configured as 393,216 words x 8 bit fifo (first in first out). the built - in address and pointer control circuits provide a straightforward bus interface to serially read/write memory that can reduce inter - chip design efforts . the 8 - bit read/write ports can operate independently at a maximum speed of 50mhz . current sources of similar memory (field memory) in the market provide limited memory size which is only enough for holding a tv field, but not enough for a whole pc v ideo frame which normally contains 640x480 or 720x480 bytes. the averlogic al422 provides 50% more memory to support high resolution for digital pc graphic or video applications. the 50% increase in speed also expands the range of applications. for more information about the al422 b or other averlogic products, please contact your local authorized distributor, representative, visit our website, or contact us directly. d istributed by :
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