sm5838a Nippon Precision Circuits Inc, (NPC), sm5838a Datasheet - Page 10

• Manufacturer Part Number: sm5838a
• Description: 5120 ? 8-bit Synchronous Fifo
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

High-speed Conversion
For example, an NTSC signal interlace-to-noninterlace conversion. If interpolated line data can be assumed to
be similar to the preceding line data and the write data rate is 14.3MHz (4f
by reading twice at 28.6MHz (8f
Furthermore, interpolated line data, with appropriate signal processing separation, can be read out line-by-line
by alternating between 2 SM5838AS devices (1 line/device).
In reality, however, double the number of devices are required for luminance signal (Y) and color difference
signal (C) systems. And triple the number of devices are required for RGB signal systems.
Preceding line data used as interpolated line
Interpolated data used as interpolated line
(A)DOUT
(B)DOUT
DOUT
(A)DIN
(B)DIN
(A)OE
CLK
(A)RE
(A)RR
(B)RE
(B)OE
(B)RR
DIN
RW
WE
CLK
RE
OE
RR
RW
WE
0 1 2 3 4 5
0 1 2 3 4 5
0 1 2 3 4 5
0 1 2 3 4 5
0
0
0
1
1
1
nH-1H
nH'-1H
2
2
2
909
SC
909
nH
nH'
nH
).
0 1 2 3 4 5
*Output data 867 to 909 forms the preceding 1H data.
*Output data 867 to 909 forms the preceding 1H data.
0 1 2 3 4 5
nH
nH
SM5838AS
1819
909
909 *
1819
909
909
909 *
0 1 2
0 1 2
0 1 2 3 4 5
0 1 2 3 4 5
0
0
0
1
1
1
nH
2
nH'
2
2
SC
), then conversion can be realized
nH+1H
909
nH'+1H
nH+1H
909
SEIKO NPC CORPORATION —10
0 1 2 3 4 5
0 1 2 3 4 5
nH+1H
nH+1H
909
909 *
909
909
909 *