PCI1450 datasheet(29/132 Pages) TI

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PCI1450 GFN/GJG

PC CARD CONTROLLER

SCPS044 – SEPTEMBER 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PC Card

I/F

Card Output

Enable Logic

PC Card

Socket 0

ZVEN0

PC Card

I/F

PC Card

Socket 1

ZVEN1

PORTSEL

ZVOUTEN

ZVSTAT

Note: ZVSTAT must be enabled

through the GPIO Control Register

19 Video Signals

4 Audio Signals

VGA

Audio

Codec

Zoomed Video Subsystem

NOTES: A. ZVSTAT must be enabled through the GPIO control register.

Figure 10. Zoomed Video Subsystem

zoomed video auto detect

Zoomed video auto detect, when enabled, allows the PCI1450 to automatically detect zoomed video data by

sensing the pixel clock from each socket and/or from a third zoomed video source that may exist on the

motherboard. The PCI1450 automatically switches the internal zoomed video MUX to route the zoomed video

stream to the PCI1450’s zoomed video output port. This eliminates the need for software to switch the internal

MUX using the

multimedia control register (PCI offset 84h, bits 6 and 7).

The PCI1450 can be programmed to switch a third zoomed video source by programming IRQMUX2 as a

zoomed video pixel clock sense pin and connecting this pin to the pixel clock of the third zoomed video source.

ZVSTAT may then be programmed onto IRQMUX4 and this signal may switch the zoomed video buffers from

the third zoomed video source. To account for the possibility of several zoomed video sources being enabled

at the same time, a programmable priority scheme may be enabled.

PCI1450 Datasheet(PDF) 29 Page - Texas Instruments

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