ISL59532_07 INTERSIL [Intersil Corporation], ISL59532_07 Datasheet - Page 20

• Manufacturer Part Number: ISL59532_07
• Description: 32x32 Video Crosspoint
• Manufacturer: INTERSIL [Intersil Corporation]

Enabling Outputs
The output enable control word is used to enable individual outputs. There are 32 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
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 x1 or x2 using the Gain Set word. It is in the same format as the output enable control word:
Set G
Broadcast Mode
The Broadcast Mode routes one input to all 32 outputs. The broadcast control word is:
I
enable Broadcast Mode, or to 0 to disable Broadcast Mode. When Broadcast Mode is disabled, the previous channel assignments
are restored.
Control Word
The ISL59532’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
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.
B15 B14 B13 B12 B11 B10
4
B15 B14 B13 B12 B11 B10
B15 B14 B13 B12 B11 B10
B15
:I
1
0
0
0
0
0
0
0
0
0
0
form the 5-bit word indicating the input channel (0 to 31) to be sent to all 32 outputs. Set the Enable Broadcast bit (B0) = 1 to
N
1
0
0
0
0
1
1
1
1
B14
= 0 for a gain of x1 or 1 for a gain of x2.
1
1
1
1
1
1
0
0
0
0
N
B13
bit = 0 tri-states the output. Setting the O
1
0
0
0
0
0
0
0
0
0
B12
0
I
4
0
0
0
0
0
0
0
0
0
B11
0
0
0
0
I
0
0
0
0
3
20
0: Clamp Disabled
1: Clamp Enabled
B10
I
B9
2
Clamp
B9
0
0
1
1
0
0
1
1
B9
B9
I
1
B8
B8
0
1
0
1
0
1
0
1
B8
I
TABLE 7. CONTROL WORD FORMAT
TABLE 4. OUTPUT ENABLE FORMAT
B8 B7 B6 B5 B4 B3 B2
0
0
TABLE 6. BROADCAST FORMAT
TABLE 5. GAIN SET FORMAT
0
B7
0
O
O
O
G
G
G
B7
O
B7
G
15
23
31
0
15
23
31
7
N
7
bit = 1 enables the output if the Global Output Enable bit is also set (the
ISL59532
B6
0
0
0
O
O
O
G
G
G
B6
O
B6
G
14
22
30
B5
14
22
30
6
6
0
0
0
B4
0
O
O
O
G
G
G
B5
O
B5
G
0: Standby
1: Operational
13
21
29
13
21
29
5
5
Power
B3
0
B1
O
O
O
G
G
G
B4
O
B4
G
B2
12
20
28
12
20
28
0
4
4
0: All outputs tristated
1: Individual Output Enable bits control outputs
B1
0
G
G
O
O
G
O
B3
O
B3
G
11
19
27
11
19
27
3
3
0: Broadcast Mode Disabled
1: Broadcast Mode Enabled
Global Output Enable
G
G
G
O
O
O
B2
G
B2
O
Enable Broadcast
10
18
26
10
18
26
2
2
B0
B0
G
G
O
O
B1
G
G
B1
O
O
17
25
17
25
1
9
1
9
REF
February 7, 2007
.
G
G
O
O
B0
G
G
FN7432.5
B0
O
O
16
24
16
24
0
8
0
8