Typical Zv Port Implementation - Intel PD6730 Application Note

Note that ZV Port implementation is likely to vary depending on the platform; the Socket Services
software must be customized to address these variances. Controlling the OE (output enable) inputs
of the external buffers depends upon specific hardware design and software needs to be aware of
specifics, such as the I/O Port addresses.
When the PC Card Multimedia mode is used, Intel recommends that the ZV Port pins be connected
as shown in Tables 1–3 for the various controller devices. The pin assignments provided in the
tables ensure signal integrity and compliance with the ZV Port standard. By disabling or powering
down the ZV Port, this connection between the GD7XXX and the PC Card bus does not interfere
with the normal (non-multimedia) PC Card bus operation.
When the ZV Port is disabled, VPM (Video Port Manager) software or other client drivers must
program the VGA controller so as not to adversely affect the video port of the VGA controller. A
bus switch, turned off during normal PC Card bus operation, may be needed to reduce the load on
the PC Card bus.
Figure 1. Typical ZV Port Implementation
DRAM
GD7XXX
MOTHERBOARD
Application Note
TV LCD CRT
ANALOG
ENCODER
AMP
AUDIO
CODEC
4 PCM
19
AUDIO
ZV PORT
INPUT
(Video)
PD6722
PD6729
PD6730
PD6832
PD6833
PD672X/30/32/33 — ZV Port Implementation
SPEAKERS
4
AUDIO
PC CARD
INTERFACE
19
VIDEO & CONTROL
PC CARD
PCM
AUDIO
CONVERTER
VIDEO
DECODER
VIDEO
NTSC/PAL
RF SIGNAL
7