GAL20V8B-25QJNI

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The GAL20V8B-25QJNI is an embedded programmable logic device belong to the CPLDs (Complex Programmable Logic Devices) category. It is manufactured by Lattice semiconductor and has been on the market since 1999. As stated in the datasheet, it features a 20V8 logic array, is highly resistant to noise, and is able to tolerate up to +15V/-15V power supply without the need of a separate voltage regulator.

The broad application range of GAL20V8B-25QJNI makes it applicable in various places. It can be used as a system configuration device, as a digital component in industrial process control systems, and as a controller in security systems. It has been effectively employed in a variety of embedded system designs and products, such as printers, modems, CD players, digital cameras, barcode readers, etc.

The GAL20V8B-25QJNI is functionally identical to the GAL16V8, but features a higher storage capacity. It incorporates 20 separate output enables and is capable of supporting up to 256 product terms, making it suitable for implementing state machines, memory architectures and complex logic designs. Furthermore, the device offers two extra registered product terms providing improved clock edge triggering and data synchronization.

In terms of working principle, the GAL20V8B-25QJNI employs a programming scheme which allows the user to program selected bits for permanently modifying the device output. Each device contains twenty 8-bit registers, each of which is linked to nine product term lines. This provides a total of 160 product terms that can be used to form the logic equations. Each of the eight output enables drives the selected product term, forming the final output value.

The programming mode is selected by placing the appropriate logic levels on three control pins. The programmer first instructs the GAL20V8B-25QJNI to enter read/write/verify (or erase) mode. In the case of write/verify mode, the programmer supplies the desired data pattern on the register and then initiates external verification. The data is written into the device and then read back for comparison. If the data matches, the programmed bit is considered to be valid.

In addition to the simple read/write/verify procedure, the GAL20V8B-25QJNI also provides several additional features and benefits to users. It offers a separate user data latch which can be used to store the programmed values, thereby avoiding the necessity of re-programming the device each time power is applied. It also incorporates a control pin that enables the user to force the device into a restart mode, where it is re-initialized to the previously programmed state. In addition, the device also has built-in concurrency protection mechanisms to prevent two user programs from interfering with each other.

Overall, the GAL20V8B-25QJNI is a highly versatile programmable logic device that offers a wide range of features and benefits for users. It is widely used in a variety of embedded systems, such as printers, modems, digital cameras, etc., and is suitable for implementing state machines, memory architectures and complex logic designs. The intuitive read/write/verify procedure, user data latch and concurrency protection mechanisms all make the GAL20V8B-25QJNI a cost-effective and reliable solution for embedded system designs.

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