Intel PD6730 Installation and operating instructions

PD672X/30/32/33 — ZV Port
Implementation
Application Note
May 2001
As of May 2001, this document replaces the Basis Communications Corp. document AN-PD10.

Application Note
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The PD672X/30/32/33 —ZV Port Implementation may contain design defects or errors known as errata which may cause the product to deviate from
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Application Note 3
PD672X/30/32/33 —ZV Port Implementation
Contents
1.0 Introduction..................................................................................................................5
2.0 Overview........................................................................................................................6
3.0 Zoomed Video (ZV)....................................................................................................6
4.0 A Typical ZV Port Implementation ......................................................................6
5.0 Dedicated Socket Approach to ZV Port Implementation...........................9
6.0 Buffer Implementation for Audio DAC.............................................................10
7.0 ZV Port Implementation for Socket A and B.................................................11
8.0 Layout Guidelines....................................................................................................15
Figures
1 Typical ZV Port Implementation............................................................................7
2 Dedicated Socket Approach to ZV Port Implementation.......................................9
3 Buffer Implementation for Audio DAC.................................................................10
4 ZV Port Implementation for Socket A and B........................................................11
Tables
1 PC Card, ZV Port, and PD6722 Pin Assignment ................................................11
2 PC Card, ZV Port, and PD6729 Pin Assignment ................................................12
3 PC Card, ZV Port, and PD6730/’6832 Pin Assignment.......................................13

4Application Note
PD672X/30/32/33 — ZV Port Implementation

PD672X/30/32/33 —ZV Port Implementation
Application Note 5
1.0 Introduction
The PD6710, PD6722, and PD6729 are single-chip PCMCIA interface controllers capable of
controlling one or two PCMCIA or compact Flash sockets, respectively. They are designed for use
in embedded applications and notebook systems where reduced form factor and low power
consumption are critical design objectives.
Current typical application examples include:
With the PD6710, a complete single-socket PCMCIA solution with power-control circuitry can
occupy less than 1.5 square inches (10 square centimeters) of board space. Similarly, with the
PD6722 and PD6729, a complete dual-socket PCMCIA solution with power-control circuitry can
occupy less than 2 square inches (13 square centimeters) of board space.
The PD67XX controllers are completely compatible with the standards of PCMCIA (Personal
Card Memory International Association) Release 2.0 Standard as well as JEIDA (Japan Electronic
Industry Development Association) Version 4.1 Standard (PD6729 is compliant with the PCI 2.1
Specification. The PD67XX controllers also offer special power-saving features such as Automatic
Low-power Dynamic Mode and Suspend Mode. Both controllers are true mixed-voltage devices
that can operate at +5 volts, +3.3 volts, or a combination of these at various interfaces. The
controllers have full internal buffering and require no additional circuitry to interface to the ISA (or
ISA-like) Bus for the PD6710 and PD6722, and the PCI Bus for PD6729, or to PCMCIA sockets.
Note: In this document, PD67XX represents the PD6710, PD6722, and PD6729.
■Routers ■Integrated access devices
■Access network servers ■DSLAMs
■PBXs ■Terminal servers
■Vending machines ■Point of Sale terminals
■Portable handheld systems ■Navigation systems
■Data acquisition systems ■Measurement equipment
■Settop boxes

PD672X/30/32/33 —ZV Port Implementation
6Application Note
2.0 Overview
This application note discusses system design considerations associated with the implementation
of the ZV (Zoomed Video) Port when using the PD6722/’29/’30, or PD6832 controller devices.
Intended to assist the system designer, this document highlights how various aspects of the PC
Card relate to the ZV Port implementation. Since the ZV Port implementation overlaps PC Card,
graphics, and audio technologies, consulting with appropriate applications/product groups is
recommended.
3.0 Zoomed Video (ZV)
ZV is a cost-effective method of accessing live video through a PC Card. The ZV Port provides a
direct connection between a PC Card and a VGA controller and an audio DAC. It allows the PC
Card to directly write video data to an input port of a graphics controller and audio data to a digital-
to-analog converter. Intel offers a family of PC Card (PCMCIA) Controllers that support the ZV
Port standard.
4.0 A Typical ZV Port Implementation
Figure 1 on page 7 illustrates a typical ZV Port implementation with PD6722/’29/’30 and PD6832
controller devices. These devices support the ZV Port in the ‘bypass’ mode during which the
signals are directly rerouted from the PC Card bus to the Video ZV Port (the video port of the
GD7XXX device is also referred to as the V-Port). This rerouting is accomplished by tristating
specific PC Card Bus signals from the PC Card (PCMCIA) Controller. Once these signals are
tristated by the host controller during the ZV Port operation, the ZV Port-compliant PC Card drives
video and audio data on the same signals. Video signals from the PC Card are routed to the ZV
Port-capable video controller; audio signals from the PC Card are routed to the ZV Port-compliant
audio DAC in the host system. This mechanism provides an inexpensive means of adding video/
audio capability to a notebook or desktop system without any additional burden on the host bus.
As specified in the PC Card standard, a ZV Port-compliant PC Card, when inserted into a PC Card
slot, is initialized the same way as a PC Card 16. It is then recognized as a ZV Port card and
programmed accordingly by Card Services. As shown in Figure 1, the PD6722/’29/’30/’6832
enters the ZV Port mode by tristating address pins A[25:4] of the PC Card bus when the
Multimedia Enable bit (bit 0 of the Misc. Control register 1 at index 16h in the PD6722/’29/’30 and
PD6832; in the PD6832 it can also be at memory offset 816h) is set. These address pins are outputs
from the PD6722/’29/’30/’6832 during normal PC Card operation. The tristating of the address
pins by the adapter allows the A[25:4] signals to simultaneously carry video data and video capture
timing control signals directly to a video controller, and the audio signals to the audio DAC. The
PD6832 has a Multimedia Arm bit (bit 7 of the Misc. Control register 3; this register is at I/O index
2Fh, extended index 25h, or memory offset 925h) that works as the overriding control bit. Until the
Multimedia Arm bit is set, the Multimedia Enable bit does not tristate the address bit as previously
described. When the Multimedia Expand bit (bit 6 of Misc. Control register 3) is set to ‘1’, CE2
and D[15:8] are tristated on the 16-bit PC Card bus, in addition to the tristating of the address
signals A[25:4]. The Multimedia Expand bus allows 24-bit video from the ZV Port-compliant PC
Card.

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
4PCM
AUDIO
INPUT
19
ZV PORT
(Video)
HOST BUS
PD6833
ENCODER
RF SIGNAL
CONVERTER
DECODER

PD672X/30/32/33 —ZV Port Implementation
8Application Note
A buffer circuit placed between the PC Card bus and the VGA video port reduces the trace length
to lower the loading effect. The ZV Port standard requires that the length of the trace between the
PC Card connector and the buffer (if used) must be less than two inches. Buffers are also needed to
support ZV Port PC Cards in either socket.
In a full implementation of the ZV Port, multiple PC Card slots can be used to implement the ZV
Port. This implies that the user inserts the multimedia PC Card into either slot and the system is
able to recognize and respond to this event appropriately. To allow the multimedia PC Card to be
inserted into either slot, the individual PC Card bus must be isolated from the other bus by using
buffers in the system. The following block diagrams illustrate possible ZV Port implementations.
Note that the control signal inputs to the buffers can be controlled by different methods. For the
GD7XXX, the buffer control comes from the I/O pins of the GD7XXX that are labeled VPCNTL
and TVON. For further information, refer to the application note titled, “V-Port Implementation for
the GD7548 Super VGA Controller”.

PD672X/30/32/33 —ZV Port Implementation
Application Note 9
5.0 Dedicated Socket Approach to ZV Port
Implementation
Figure 2 shows a solution using the PD6722/’29/’30/’6832 Controller and the GD7XXX Super
VGA controller to support a single dedicated ZV Port slot. This simple implementation does not
require any external buffer or glue logic; the only limitation is that one socket must be dedicated to
the ZV Port. Also, depending upon the audio controller used, a buffer may be required between the
PC Card bus and the audio controller. The designer must ensure that while in R2 PC Card mode
(non-ZV operation), the traffic over the bus does not cause the audio input to be driven or the video
port of the VGA controller to be adversely affected. If the audio controller or VGA controller do
not support a shutdown mode, buffers are required in each path. Also refer to “Layout Guidelines”
on page 15 to determine if buffers are required for the video path.
Figure 2. Dedicated Socket Approach to ZV Port Implementation
GD7XXX
PD6722
PD6729
PD6730
PD6832
V-PORT
ZV PORT PC CARD
AUDIO CODEC
PC CARD BUS
PD6833

PD672X/30/32/33 —ZV Port Implementation
10 Application Note
6.0 Buffer Implementation for Audio DAC
A buffer solution to isolate the audio controller when the socket is not configured in ZV Port mode
is shown in Figure 3. This illustrates how to control the buffer enable; if the GD7XXX is used, then
one of the GPO pins can control the buffer enable.
Figure 3. Buffer Implementation for Audio DAC
GD7XXX
V-PORT
ZV PORT PC CARD
PC CARD BUS
BUFFER
AUDIO
OE
PD6722
PD6729
PD6730
PD6832
PD6833