![]() ![]() This equation will not fit on OLMC 0, 1, 2 or OMLC 7, 8 or 9. You’ll need to make sure it lines up with an OLMC that has more than 12 rows. If you have an equation with 13 terms like this arbitrary example: You can see the number of inputs for each OLMC in the functional block diagram: In the 22V10, there are a variable number of rows for each OLMC starting with 8, then incrementing by 2 for each OLMC until 16 and then decrementing by 2 until the last OLMC has 8 inputs. The GAL16V8 had a simple arrangement of 8 rows for each OLMC. The next complication to this device is that the matrix of fuses that control the AND gates is variable in the number of rows. The S0 bit controls active high and active low outputs for each OLMC. Each OLMC can be programmed separately, which means that you can designate which OLMCs are Registered and which are Combinatorial. ![]() There are only two modes: Registered and Combinatorial, controlled by the S1 bit. The OLMC modes for the GAL22V10 are built into the S0 and S1 bits. Next, the mode bits are missing (the GAL16V8 had 3 modes controlled by fuses 21). You’ll notice that there are no PTD (Product Term Disable) fuses. Here’s the full fuse map for the GAL22V10:ĥ809 S1 for OLMC 0 (registered/combinatorial) If you’re familiar with the 16V8 and have never used the 22V10, there are some confusing differences. The specifications are straightforward once you know what to expect. On first inspection, both devices look identical, except for the increased number of inputs and outputs. ![]() Here’s the specification sheet for the GAL22V10: Lattice GAL22V10 Specifications. In this blog post, I’m going to discuss the differences between the 16V8 and the 22V10. In previous blog posts, I showed how the GAL16V8 operated and how to program it (see here and here). ![]()
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