Manufacturer SPLD Products WWW Locator

Commercial Devices In Chapter 3 we described the three main types of programmable logic devices (PLDs): simple PLDs, complex PLDs, and field-programmable gate arrays (FPGAs). This appendix describes some examples of commercial PLD products. E.1 Simple PLDs Simple PLDs (SPLDs) include PLAs, PALs, and other similar types of devices. Some major manufacturers of SPLD products are listed in Table E.1. The first and second columns show the company name and some of the SPLD products it offers. Data sheets that describe each product can be obtained from the World Wide Web (WWW), using the locator given in the third column in the table. E.1.1 The 22V10 PAL Device PAL devices are among the most commonly used SPLDs. They are offered in a range of sizes and are identified by a part number of the form NNXMM−S. The digits NN specify the total number of input and output pins; the digits MM give the number of pins that can be used as outputs. The letter X gives additional information, such as whether the PAL contains flip-flops. The final digit, S, specifies the speed grade. This value represents the Table E.1 Commercial SPLD Products