The same goes for the preset line, which is the line that is positioned after the last matrix row starting at fuse 5764 (row 131). You can connect any logic to the reset line to perform reset via a pin, or some combination of logic. The purpose of the reset line is to reset all the registers used in the device. The reset line causes the starting fuse of the first OLMC to be 44 instead of zero. Two extra lines can be used to control reset and set for all registers (assuming you use the registered mode). Each input and feedback takes 2 columns (the signal and the inverse of the signal). The number of columns is determined by the total number of inputs and feedback wires.
The number of columns is 44, which is not a round binary number. What this means is that you will have to rearrange your output pins for circuits that use more than 8 rows because each OLMC is tied to a specific output pin.Īlso, since there are more inputs, then there are also more columns in the matrix. 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.
#G540 PROGRAMMER GAL FULL#
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.
#G540 PROGRAMMER GAL HOW TO#
In previous blog posts I showed how the GAL16V8 operated and how to program it (see here and here).
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