ISL59530_07 Datasheet, PDF(18/22 Page) Intersil Corporation

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ISL59530_07 Datasheet, PDF (18/22 Pages) Intersil Corporation – 16x16 Video Crosspoint

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ISL59530

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 four outputs at a time. The bank is selected by bits B9 and B8. The output enable

control word format is:

TABLE 4. OUTPUT ENABLE FORMAT

B15 B14 B13 B12 B11 B10 B9

001000

O11

O10

O15

O14

O13

O12

Setting the ON bit = 0 tri-states the output. Setting the ON 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 x1 or x2 using the Gain Set word. It is in the same format as the output enable control word:

TABLE 5. GAIN SET FORMAT

B15 B14 B13 B12 B11 B10 B9

010000

G11

G10

G15

G14

G13

G12

Set GN = 0 for a gain of x1 or 1 for a gain of x2.

Broadcast Mode

The Broadcast Mode routes one input to all 16 outputs. The broadcast control word is:

TABLE 6. BROADCAST FORMAT

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2

Enable Broadcast

0: Broadcast Mode Disabled

1: Broadcast Mode Enabled

I3:I0 form the 4 bit word indicating the input channel (0 to 15) 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 ISL59530âs 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:

TABLE 7. CONTROL WORD FORMAT

B15 B14 B13 B12 B11 B10

B8 B7 B6 B5 B4 B3 B2

111000

Clamp

00000 0 0

Power

Global Output Enable

0: Clamp Disabled

0: Standby 0: All outputs tristated

1: Clamp Enabled

1: Operational 1: Individual Output Enable bits control outputs

The Clamp bit enables the input clamp function, forcing the AC-coupled signalâs most negative point to be equal to VREF.

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.

FN6220.3

February 7, 2007

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