參數(shù)資料
型號(hào)： SAA7187
廠商： NXP Semiconductors N.V.
英文描述： Digital video encoder (DENC2-SQ)(數(shù)字視頻編碼器)
中文描述： 數(shù)字視頻編碼器（DENC2 -倚）（數(shù)字視頻編碼器）
文件頁(yè)數(shù)： 6/18頁(yè)
文件大小： 197K
代理商： SAA7187
Philips Semiconductors
Clock and synchronization signals of SAA7187 and SAA7188
Application note for digital video encoder
May 1994
6
3.2
Horizontal – Line –
Reference Output Signals
The digital encoder SAA7187 and SAA7188A
have two pins to output line reference Raster
Control signals. RCM2 on pin 30 has output
only functionality, and a fixed (nominal) signal
polarity. RCV2 on pin 7 has selectable signal
polarity and can be used as output, or as
trigger input to re–synchronize internal timing,
or as ‘blanking’ input to gate input data
stream (see later in this application note).
Both horizontal raster control output signals
can be freely defined along the line, and are
active (nominal high) between “begin” and
“end” (see Table 4). Begin and end can be
chosen independently for RCM2 and RCV2.
Both pairs are relative to the same internal
horizontal counter, and are defined in LLC
clocks. The internal horizontal counter
manifests its timing in the analog output, and
can depend on re–trigger via RCV1 or RCV2
input signals and programming of HTRIG
under subaddress 6Ehex and 6Fhex (see
later in this application note).
RCM2 and RCV2 as output are auxiliary
timing signals for use by the application
environment, e.g., to help the data source
(MPEG decompression circuitry, video
memory controller or graphics overlay
generator) to time its data stream, or disable
it. The programming of RCM2 and RCV2 as
output does not effect internal blanking, data
enabling, or any timing or processing in the
encoder IC itself.
3.2.1
Pin 30 RCM2 has output only function. RCM2
is active high between ‘Begin = BMRQ’ and
‘End = EMRQ’ in every line, i.e., also during
vertical blanking interval VBI. Programming of
FAL and LAL has no effect on RCM2. If End
is programmed before (i.e., with a lower
number than) Begin, RCM2 may be
seen/understood as an active low signal
between End and Begin.
Pin 30:
RCM2
3.2.2
Pin 7 RCV2 can assume output as well as
input function (see Tables 3, 4, and 5).
Pin 7 as Output : RCV2
Program bit ORCV2 = 1 defines pin 7 for
RCV2 output signal. RCV2 output is active
(nominal high) from programmed ‘Begin =
BRCV’ to ‘End = ERCV’. The polarity is
defined by program bit PRCV2.
Program bit CBLF defines whether RCV2
output is active in every line (CBLF = 0),
regardless of vertical position, or whether
RCV2 output is only active during selected
vertical active range (CBLF = 1). Vertical
active range is defined between ‘first active
line’ FAL and ‘last active line’ LAL under
subaddress 7Bhex to 7Dhex. By that, RCV2
as output signal could be used as horizontal
line timing reference signal (“HREF”) or as
composite blanking signal (“CBN”), to enable
data output at the video signal source. But if
pin 7 is programmed as RCV2 output signal,
its signal and related programming has no
effect for any timing, blanking, data enabling
or processing in the encoder IC itself. FAL
and LAL defines internal vertical blanking,
independently of whether CBLF is selecting it
for gating of RCV2 output or not.
Table 4. Definition of output timing of RCM2 (pin 30) and RCV2 (pin 7)
áááá
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PROGRAM
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BRMQ
áááááááááááááá
áááááááááááááá
11 BIT ADDRESS IN HORIZONTAL DIRECTION
LLC RESOLUTION
áááááááááááááá
subaddress 71hex, 73hex
ááááááááá
ááááááááá
RCM2 PIN30
OUTPUT ONLY
ááááááááá
L-to-H transition, rising edge
áááááááááá
áááááááááá
RCV2 PIN7
ONLY IF OUTPUT
áááááááááá
áááááááááá
áááá
áááá
ERMQ
áááá
áááááááááááááá
áááááááááááááá
subaddress 72hex, 73hex
áááááááááááááá
ááááááááá
ááááááááá
H-to-L transition, falling edge
ááááááááá
áááááááááá
áááááááááá
áááááááááá
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áááááááááááááá
ááááááááá
ááááááááá
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áááááááááááááá
ááááááááá
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Table 5. Selection of RCV2 output signal function on pin 7
F = relevant function, x = other function/signal definition, – = don’t care
BITS IN SUBAD-
DRESS 6Chex
SHORT NAME
FUNCTION DESCRIPTION
7 6
5
4
3
2
1
0
x
x
x
x
x
x
x
F
PRCV2
Polarity of RCV2
x
x
x
x
x
x
F
x
ORCV2
I/O of RCV2
x
x
x
x
x
F
x
x
CBLF
RCV2 in VBI (see FAL and LAL)
x
0
x
input
RVC2 is input, see Table 7
0
1
0
“HREF”
RCV2
output
is active
high
between BRCV till ERCV in every line of the entire field, i.e.,
including
VBI
0
1
1
“HREF_”
RCV2
output
is active
low
between BRCV till ERCV in every line of the entire field, i.e.,
including
VBI
1
1
0
“CBN”
RCV2
output
is active
high
between BRCV till ERCV in active lines only from FAL to LAL,
i.e.,
excluding
VBI
1
1
1
“CB”
RCV2
output
is active
low
between BRCV till ERCV in active lines only from FAL to LAL,
i.e.,
excluding
VBI
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