Lattice Semiconductor ISPLSI1024-60LJ: A High-Density Programmable Logic Device for Complex Digital Systems

In the realm of digital system design, the need for flexible, high-density, and reliable logic integration is paramount. The Lattice Semiconductor ISPLSI1024-60LJ stands as a quintessential solution from the era of high-performance Complex Programmable Logic Devices (CPLDs), engineered to address the challenges of implementing complex logic in a single, compact package.

As a member of the high-density ispLSI 1000E family, this device is built upon an advanced E²CMOS technology that combines Electrically Erasable (E²) programmability with the high performance and density of CMOS. The "-60LJ" suffix specifically denotes a 60ns maximum pin-to-pin delay and an 84-pin PLCC (Plastic Leaded Chip Carrier) package, making it suitable for a wide range of commercial applications.

The core architecture of the ISPLSI1024 is a testament to its integration capabilities. It features 1,000 usable gates and up to 72 I/O pins, organized around a Global Routing Pool (GRP). This GRP connects multiple Generic Logic Blocks (GLBs), each containing programmable macrocells that can be configured for a vast array of combinatorial and sequential logic functions. This internal structure provides a powerful and flexible fabric for designers to consolidate dozens of standard logic ICs into one device, significantly reducing board space, component count, and overall system power consumption.

A defining feature of this family is its In-System Programmability (ISP), which is embedded in the very name "ispLSI." This capability allows the device's logic to be reconfigured or updated after it has been soldered onto a printed circuit board (PCB). Through a standard 5-wire JTAG (IEEE 1149.1) interface, engineers can perform rapid design iterations and field upgrades without the physical hassle of removing and replacing chips, drastically accelerating development cycles and time-to-market.

The ISPLSI1024-60LJ is particularly well-suited for a diverse set of applications, including but not limited to:

System glue logic: Integrating address decoders, bus controllers, and memory interfaces in microprocessor-based systems.

State machine design: Implementing complex control logic and finite state machines (FSMs).

Communication interfacing: Functioning as a bridge between different digital subsystems with varying protocols or voltage levels.

Digital signal processing: Performing pre-processing or control functions for DSP chips.

Despite being a product of its time, the principles it embodies—high integration, in-system programmability, and design flexibility—remain foundational in modern digital design, paving the way for today's even more complex FPGAs and SoCs.

ICGOOODFIND

The Lattice ispLSI1024-60LJ is a high-density, in-system programmable logic device that offered designers a powerful tool for integrating complex digital logic, reducing system size and cost, while enabling unparalleled design flexibility and faster prototyping through its JTAG interface.

Keywords: In-System Programmability (ISP), High-Density Logic, Complex Programmable Logic Device (CPLD), JTAG Interface, E²CMOS Technology