PCI1620 Datasheet, PDF (51/164 Pages) Texas Instruments – DUAL-SOCKET PL CARD AND UITRAMEDIA CONTROLLER

System designs with a requirement to provide the newer UltraMedia-compatible 1.8-V Vpp core voltage should select
the TI TPS2228 switch and set the VPP1_8_SEL bit (bit 8) of the the general control register (offset 86h, see Section
4.33) to 1. For system designs with a requirement to supply the 12-V Vpp programming voltage, the TI TPS2226
power-interface switch is the best choice, and requires both VPP12_EN and VPP1_8_SEL (bits 9 and 8) of the
general control register (offset 86h, see Section 4.33) to be set to 1. Furthermore, it is possible to provide 1.8 V Vpp
using the TPS2226 by supplying the 12-V switch input terminal with 1.8 volts, clearing both VPP12_EN and
VPP1_8_SEL (bits 9 and 8) of the general control register (offset 86h, see Section 4.33). Lastly, both the TPS2226
and TPS2228 switches are available in pin compatible (30-pin) packages that allow system designers the ability to
provide for either voltage level in a single design.
Figure 3−5 illustrates a typical application using the TPS222X with the PCI1620 UltraMedia controller. (The data
sheets for the individual TI TPS222x power-interface switches should be consulted for a complete overview of
backward and forward compatibility.)
Power Supply
12 V
5V
3.3 V
1.8 V†
TPS222X
12 V
5V
3.3 V
1.8 V†
AVPP
AVCC
AVCC
AVCC
PC/UltraMedia
VPP1
Card A
VPP2
VCC
VCC
Supervisor
PCI1620
3
RESET
Serial P2C
BVPP
BVCC
BVCC
BVCC
PC/UltraMedia
VPP1
Card B
VPP2
VCC
VCC
† _{UltraMedia option. 1.8-V input available on TPS2228}
Figure 3−5. TPS222X Typical Application
3.5.4 Zoomed-Video Support
The PCI1620 allows for the implementation of zoomed video (ZV) for PC Cards. Zoomed video is supported by setting
bit 6 (ZVENABLE) in the card control register (PCI offset 91h, see Section 4.40) on a per-socket function basis.
Setting this bit puts 16-bit PC Card address lines A25−A4 of the PC Card interface in the high-impedance state. These
lines can then transfer video and audio data directly to the appropriate controller. Card address lines A3−A0 can still
access PC Card CIS registers for PC Card configuration. Figure 3−6 illustrates a PCI1620 ZV implementation.
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