PCI1420 Datasheet, PDF (35/137 Pages) Texas Instruments – PC Card Controllers

Power Supply
12 V
5V
3.3 V
Supervisor
PCI1420
(PCMCIA
Controller)
12 V
5V
3.3 V
TPS2206
AVPP
AVCC
RESET
RESET
AVCC
AVCC
CLOCK
DATA
LATCH
BVPP
BVCC
BVCC
BVCC
VPP1
VPP2
VCC
VCC
PC Card
A
VPP1
VPP2
VCC
VCC
PC Card
B
Figure 3–4. TPS2206 Typical Application
3.5.3 Zoomed Video Support
The PCI1420 allows for the implementation of zoomed video for PC Cards. Zoomed video is supported by setting
bit 6 (ZVENABLE) in the card control register (see Section 4.32) 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 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 3–5 illustrates a PCI1420 ZV implementation.
CRT
Speakers
Motherboard
PCI Bus
VGA
Controller
Audio
Codec
Zoomed Video
Port
PCM
Audio
Input
19
4
PCI1420
PC Card
19
PC Card
Interface
Video
Audio
4
Figure 3–5. Zoomed Video Implementation Using PCI1420
Not shown in Figure 3–5 is the multiplexing scheme used to route either socket 0 or socket 1 ZV source to the graphics
controller. The PCI1420 provides ZVSTAT, ZVSEL0, and ZVSEL1 signals on the multifunction terminals to switch
external bus drivers. Figure 3–6 shows an implementation for switching between three ZV streams using external
logic.
3–5