Article ID: 000080151 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Can I program Altera in-system programmable (ISP) devices concurrently?

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Description Yes, you can program Altera® devices that support ISP concurrently within a particular device family.

When the Joint Test Action Group (JTAG) ISP Clock (TCK) is run at high frequencies (1 to 10 MHz), the time necessary to shift data and address information into the device becomes negligible compared to the programming pulse time for the memory cells.

When programming multiple devices in a JTAG chain, concurrent programming allows the programming pulses for each of the devices to be applied simultaneously. Thus, this concurrent programming allows programming times to be significantly reduced.

When the TCK is run at low frequencies (~100 kHz), the time necessary to shift data and address information into the device becomes dominant as compared to the programming pulse time for the memory cells. Thus at these lower frequencies, concurrent programming has negligible benefits.

Altera supports concurrent programming when using Serial Vector Format files (.svf), Jam™ files (.jam), and Jam Byte-Code files (.jbc). These file formats automatically use concurrent programming whenever more than one device, of the same family, is targeted.

For more information, refer to In-System Programmability Guidelines for MAX II Devices (PDF) and AN 100: In-System Programmability Guidelines (PDF).

Related Products

This article applies to 3 products

MAX® V CPLDs
MAX® II CPLDs
Max® 9000 CPLD

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