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MTSW-104-08-T-T-225-RA

来源:LM317 Electronics Components编辑:International Rectifier时间:2021-06-15 15:26:21

Hollywood studios are too focused on protecting and managing their content, Cuban said. Meanwhile,cable companies are dragging their feet on a needed transition to better codecs such as MPEG-4. And consumer electronics companies, he said, are locked in a battle over next-generation DVD standards that pose artificial limits on how HD content will be stored.

The ispClock5500 devices' ability to store up to four timing and output configurations and easily switch between them further extends their utility by supporting easy clock margining (operating a circuit board at higher than typical frequency to evaluate design robustness) and power management (conserving dynamic power consumption by downshifting” to a more efficient, lower frequency when performance is less critical). In-system programmability via the on-chip boundary scan port helps debug complex timing problems and tune individual network timing for best performance.

PAC-Designer Software PAC-Designer Version 3.0, Lattice's PC-based mixed signal design tool, provides simple and intuitive pull-down menus for configuring all programmable features of the ispClock5500 devices. In addition, utilities such as a Skew Editor, Frequency Calculator and Frequency Synthesis support easy configuration of various counters while operating the PLL in its optimal operating range. Design configurations can be downloaded quickly into ispClock5500 devices via the PC parallel port. This version of the software can be downloaded for free from www.latticesemi.com

MTSW-104-08-T-T-225-RA

Lattice Semiconductor Corporation designs, develops and markets the broadest range of Field Programmable Gate Arrays (FPGA), Field Programmable System Chips (FPSC) and high-performance ISP Programmable Logic Devices (PLD), including Complex Programmable Logic Devices (CPLD), Programmable Analog Chips (PAC), and Programmable Digital Interconnect (GDX). Lattice also offers industry leading SERDES products. Lattice is Bringing the Best Together” with comprehensive solutions for today's system designs, delivering innovative programmable silicon products that embody leading-edge system expertise.

Lattice products are sold worldwide through an extensive network of independent sales representatives and distributors, primarily to OEM customers in the fields of communications, computing, computer peripherals, instrumentation, industrial controls and military systems. Company headquarters are located at 5555 NE Moore Court, Hillsboro, Oregon 97124-6421, USA; telephone 503-268-8000, fax 503-268-8037.

Designers of circuit boards have to deal with several clocks when laying out a board. Among them are the main CPU, memory, ASIC chips, complex programmable logic devices (CPLD), and the power supply. Lattice noticed that engineers were still using discrete components to build their clocks, thus adding significantly to the component count. Lattice took the essential components of the clock network, clock generator, sources of the frequency and the fan out buffer, and put it all together on one chip and made it programmable — and that essentially is the ispClock.

MTSW-104-08-T-T-225-RA

In the clock chip marketplace speed is king and if you want to increase your system speed then you increase your clock speed. Designers also increase the speed of the clock when there is a need for improved signal integrity or reduce errors between two chips. Also, as the frequency increases the timing available for the setup and hold times causing trace length mismatch to become a significant issue. Clock mismatch and output to output skew are other issues for designers. These are difficulties that can make every designer's job a nightmare, and that's where Lattice stepped in. The company decided it could resolve these issues with one comprehensive design — one chip for all clocks.

How it works The ispClock 5500 programmable clock has a universal fan-out buffer. It generates multiple clock frequencies that are very accurate. The key performance blocks of this chip are the high-performance PLL for clock generation, programmable on-chip dividers and programmable loop filters — and that means you don't have to add RC networks. Lattice calls this a universal standard buffer because it interfaces with most common logic input standards. Additionally, every output has its own slew control for operations like EMI reduction. Outputs can be skewed relative to the other outputs. A skew manager helps you control the output skew. It also has on-chip termination that is programmable to make the clock output impedance comparable to the trace it is driving.

MTSW-104-08-T-T-225-RA

You may wonder if the chip can drive more than one fan out buffer at the same time to drive the likes of LVDS and SSTL. It can, and you could use it for the same frequency on the same PCB. This helps solve network problems by mixing and matching the output voltages and standards, which provides the best signal integration by fine tuning the output impedance.

The 5500 is chock-full of functions. The input can be configured through software as LVTTL, LVCMOS, SSTL, HSTL, LVDS, and PVPECL. You can also program the input termination resistors with the software. Additionally, the device has a PLL on chip, contains input dividers, a phase and frequency detector, a filter, and a VCO. The 5500 also contains 5 clock output dividers and an output routing matrix to connect to any output, universal fan-out buffer with a skew control for each output and the output drivers. Finally, every output buffer can be individually configured to what you need.

We need to use technology to increase the enjoyment of the end user,” Cuban said. If you just do what's best for content, cable guys will come along.”

Several vendors bashed the so-called Digital Cable Ready agreement, under which TV makers are putting a government-mandated slot into their digital sets and cable companies are selling an access card that provides the link to their services. But cable companies are discouraging the use of today's one-way CableCards because the cards do not support their video-on-demand or electronic program guide services.

Negotiations are still dragging on over two-way cards. TV makers oppose demands from content providers to turn off or reduce resolution on analog HD transmissions to prevent consumers from copying unprotected HD analog content. No decision on the issue is expected for at least a year.

TV makers fear users will want to return their Digital Cable Ready sets after cable operators advise users they should buy a set-top box rather than a CableCard.

It's a mess,” said Cuban.

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