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PCI1221 датащи(PDF) 26 Page - Texas Instruments

номер детали PCI1221
подробное описание детали  PC CARD CONTROLLERS
PDF  123 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

PCI1221 датащи(HTML) 26 Page - Texas Instruments

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PCI1221 GHK/PDV
PC CARD CONTROLLERS
SCPS042 – JULY 1998
26
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
zoom video support
The PCI1221 allows for the implementation of zoom video for PC Cards. Zoom video is supported by setting
the ZVENABLE bit in the card control register on a per socket function basis. Setting this bit puts PC Card-16
address lines A25–A4 of the PC Card interface in the high-impedance state. These lines can then be used to
transfer video and audio data directly to the appropriate controller. Card address lines A3-A0 can still be used
to access PC Card CIS registers for PC Card configuration. Figure 4 illustrates a PCI1221 ZV implementation.
CRT
VGA
Controller
Audio
Codec
PCI1221
19
4
Zoom Video
Port
PCM
Audio
Input
PCI Bus
PC Card
Interface
Video
Audio
19
4
PC Card
Motherboard
Speakers
Figure 4. Zoom Video Implementation Using PCI1221
Not shown in Figure 4 is the multiplexing scheme used to route either socket 0 or socket 1 ZV source to the
graphics controller. The PCI1221 provides ZVSTAT, ZVSEL0, and ZVSEL1 signals on the multifunction
terminals to switch external bus drivers. Figure 5 shows an implementation for switching between three ZV
streams using external logic.
ZVSTAT
ZVSEL0
ZVSEL1
PCI1221
2
0
1
Figure 5. Zoom Video Switching Application



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