GS6151 datasheet(17/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

17 of 77

Semtech

Proprietary & Confidential

www.semtech.com

4.1.2 Input Selection

The GS6151 incorporates a 2:1 input selector which allows the connection of two

independent streams of video/data.

The selector is controllable in three separate ways:

1. The DDI_SEL/STROBE pin can be used to select the input.

2. A GSPI accessible register can be used to select the input, with the state change

occurring as soon as the register value changes.

3. A GSPI accessible register can be used to select the input, with a rising edge on the

STROBE pin triggering a change to the next state.

Since these states are mutually exclusive, the DDI_SEL pin is shared with the STROBE

function.

In the case of using the DDI_SEL/STROBE pin (#1 above) or the STROBE pre-select

method (#3 above), the input selector will switch within 1μs of the change of state on

the corresponding pin(s). This strict timing requirement is not maintained when using

GSPI register selection (#2 above).

Each of the device’s two inputs is selected as shown in Table 4-2.

The DDI_SEL/STROBE pin includes an internal pull-down, which pulls the input voltage

LOW if the pin is left unconnected.

When using the STROBE pre-select method (#3 above), the pre-selected input buffer

and trace EQ is powered up in advance of the STROBE pulse.

Table 4-2: Pin and Register Settings for Input Selection

DDI_SEL/STROBE

Differential

High-speed Input

Selected

INPUT_SELECTION_

CONTROL 7h[9:8]

DDI_SELECT

7h[10]

X0 (default)

LOW

DDI0, DDI0

X0 (default)

HIGH

DDI1, DDI1

DDI0, DDI0

DDI1, DDI1

on LOW-to-HIGH

transition

DDI0, DDI0

on LOW-to-HIGH

transition

DDI1, DDI1

Note: ‘X’ indicates ‘Do Not Care’

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