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PD672X/30/32/33 — ZV Port Implementation
Application Note 7
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
ANALOG
PD6722
PD6729
PD6730
PD6832
VIDEO
PCM
PC CARD
INTERFACE
PC CARD
MOTHERBOARD
AUDIO
VIDEO
NTSC/PAL
AUDIO
VIDEO & CONTROL
4
19
PC CARD SLOT
TV LCD CRT
AMP
AUDIO
CODEC
SPEAKERS
4
PCM
AUDIO
INPUT
19
ZV PORT
(Video)
HOST BUS
PD6833
ENCODER
RF SIGNAL
CONVERTER
DECODER