Intel PD672X/30/32/33 manual Overview, Zoomed Video ZV, Typical ZV Port Implementation

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PD672X/30/32/33 — ZV Port Implementation

2.0Overview

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.

3.0Zoomed 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.

4.0A 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.

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Application Note

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Contents PD672X/30/32/33 ZV Port Implementation Application Note Contents PD672X/30/32/33 ZV Port Implementation Introduction Overview Zoomed Video ZVTypical ZV Port Implementation Typical ZV Port Implementation PD672X/30/32/33 ZV Port Implementation Dedicated Socket Approach to ZV Port Implementation Dedicated Socket Approach to ZV Port ImplementationBuffer Implementation for Audio DAC Buffer Implementation for Audio DACPC Card ZV Port Pin PD6722S ZV Port Implementation for Socket a and BPC Card, ZV Port, and PD6722 Pin Assignment Sheet 1 CommentsPC Card, ZV Port, and PD6722 Pin Assignment Sheet 2 PC Card, ZV Port, and PD6729 Pin Assignment Sheet 1PC Card ZV Port Pin PD6729S Comments PC Card ZV Port Pin PD6729S PC Card, ZV Port, and PD6729 Pin Assignment Sheet 2PC Card, ZV Port, and PD6730/’6832 Pin Assignment Sheet 1 PC Card ZV Port Pin PD6730 orPC Card, ZV Port, and PD6730/’6832 Pin Assignment Sheet 2 PD6832 CommentsPin Layout Guidelines

PD672X/30/32/33 specifications

The Intel PD672X family, which includes the PD6720, PD6723, PD6724, and PD6725, represents a significant advancement in the realm of integrated circuit technologies, specifically catering to the demands of embedded systems and personal computer applications during the early 1990s. These components were primarily designed to serve as peripherals, particularly focusing on providing enhanced serial communication capabilities.

One of the primary features of the PD672X series is its integration of multiple communication protocols, including both RS-232 and RS-422 standards. This versatility provides developers with the ability to utilize these chips in a wide range of applications, from basic data transfer to more complex networking tasks. The chips come equipped with flexible baud rate configurations, allowing users to adapt the communication speed to the requirements of their specific applications.

Another standout technology associated with the PD672X series is the incorporation of advanced interrupt handling and buffer management systems. This feature enhances data throughput by allowing incoming data to be stored temporarily in buffers, enabling the CPU to process information without being interrupted constantly. This is particularly beneficial in environments where time-sensitive data processing is critical, such as in industrial automation and real-time communication applications.

The PD672X series is also characterized by its compact design and low power consumption, making it suitable for portable devices and applications where space and energy efficiency are of paramount importance. These attributes allow manufacturers to incorporate the chips into a broader array of devices without significant constraints on size or battery life.

Moreover, the Intel PD672X family is notable for its compatibility with a variety of operating systems, ensuring that developers can leverage its capabilities across different platforms. This compatibility promotes wider adoption of the technology, as it can easily integrate into existing systems without the need for extensive modifications.

In conclusion, the Intel PD672X/30/32/33 series stands out for its robust communication capabilities, flexible configurations, efficient data handling, compact size, and system compatibility. These features collectively contribute to its enduring relevance in the embedded systems market, providing developers with a reliable solution for a multitude of applications that require effective serial communication.
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