參數(shù)資料
型號: ISL59534
廠商: Intersil Corporation
英文描述: 32x16 Video Crosspoint
中文描述: 32x16視頻交叉點
文件頁數(shù): 18/22頁
文件大?。?/td> 1176K
代理商: ISL59534
18
FN6249.5
February 7, 2007
Enabling Outputs
The output enable control word is used to enable individual outputs. There are 16 channels to configure, so this is accomplished by
writing 4 serial words, each controlling a bank of eight outputs at a time. The bank is selected by bits B9 and B8. The output enable
control word format is:
Setting the O
N
bit = 0 tri-states the output. Setting the O
N
bit = 1 enables the output if the Global Output Enable bit is also set (the
individual output enable bits are ANDed with the Global Output Enable bit before they are sent to the output stage).
Setting the Gain
The gain of each output may be set to +1 or +2 using the Gain Set word. It is in the same format as the output enable control word:
Set G
N
= 0 for a gain of +1 or 1 for a gain of +2.
Broadcast Mode
The Broadcast Mode routes one input to all 16 outputs. The broadcast control word is:
I
4
:I
0
form the 5 bit word indicating the input channel (0 to 31) to be sent to all 16 outputs. Set the Enable Broadcast bit (B0) = 1 to
enable Broadcast Mode, or to 0 to disable Broadcast Mode. When Broadcast Mode is disabled, the previous channel assignments
are restored.
Control Word
The ISL59534’s power-on reset disables all outputs and places the part in a low-power standby mode. To enable the device, the
following control word should be sent:
The Clamp bit enables the input clamp function, forcing the AC-coupled signal’s most negative point to be equal to V
REF
.
Note:
The Clamp bit turns the DC-Restore clamp function on
or off for
all
channels - there is no DC-Restore on/off control
for individual channels. The DC-Restore function only works
with signals with sync tips (composite video). Signals that do
not have sync tips (the Chroma/C signal in s-video and the
Pb, Pr signals in Component video), will be severely
distorted if run through a DC-Restore/clamp function.
TABLE 4. OUTPUT ENABLE FORMAT
B15 B14 B13 B12 B11 B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
0
1
0
0
0
0
0
O
3
O
2
O
1
O
0
0
0
1
0
0
0
0
1
O
7
O
6
O
5
O
4
0
0
1
0
0
0
1
0
O
11
O
10
O
9
O
8
0
0
1
0
0
0
1
1
O
15
O
14
O
13
O
12
TABLE 5. GAIN SET FORMAT
B15 B14 B13 B12 B11 B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
1
0
0
0
0
0
0
G
3
G
2
G
1
G
0
0
1
0
0
0
0
0
1
G
7
G
6
G
5
G
4
0
1
0
0
0
0
1
0
G
11
G
10
G
9
G
8
0
1
0
0
0
0
1
1
G
15
G
14
G
13
G
12
TABLE 6. BROADCAST FORMAT
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
1
1
I
4
I
3
I
2
I
1
I
0
0
0
0
0
0
0
0
Enable Broadcast
0: Broadcast Mode Disabled
1: Broadcast Mode Enabled
TABLE 7. CONTROL WORD FORMAT
B15 B14 B13 B12 B11 B10
B9
B8 B7 B6 B5 B4 B3 B2
B1
B0
1
1
1
0
0
0
Clamp
0: Clamp Disabled
1: Clamp Enabled
0
0
0
0
0
0
0
Power
0: Standby
1: Operational
Global Output Enable
0: All outputs tri-stated
1: Individual Output Enable bits control outputs
ISL59534
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