51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
{
|
|
"cells": [
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"# Black boxes\n",
|
|
"The <models> section is how a primitive block can implement a black-box BLIF primitive. Open the file 03_blackbox.xml in a text editor. in the `<models>` section, find the line: `<model name=\"multiply\"> `. It declares a black-box primitive with combinational logic that connects two inputs to one output.\n",
|
|
" \n",
|
|
"Now in the `<complexblocklist>` section, find the line `<pb_type name=\"mult_16x16_slice\" height=\"4\" width=\"2\">`. This begins the definition of the black box primitive. It is given a name and dimensions in block units. The inputs and outputs are defined as two 16 bit inputs and a 32 bit output.\n",
|
|
"\n",
|
|
"The line:\n",
|
|
" ```\n",
|
|
" <pb_type name=\"mult_16x16\" blif_model=\".subckt multiply\" num_pb=\"1\">\n",
|
|
" ```\n",
|
|
" defines a sub-block that implements the `multiply` logic. This block also has two 16 bit inputs and a 32 bit output. Then the delays between the two inputs to the output are defined.\n",
|
|
" \n",
|
|
" "
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": []
|
|
}
|
|
],
|
|
"metadata": {
|
|
"kernelspec": {
|
|
"display_name": "Python 3",
|
|
"language": "python",
|
|
"name": "python3"
|
|
},
|
|
"language_info": {
|
|
"codemirror_mode": {
|
|
"name": "ipython",
|
|
"version": 3
|
|
},
|
|
"file_extension": ".py",
|
|
"mimetype": "text/x-python",
|
|
"name": "python",
|
|
"nbconvert_exporter": "python",
|
|
"pygments_lexer": "ipython3",
|
|
"version": "3.6.5"
|
|
}
|
|
},
|
|
"nbformat": 4,
|
|
"nbformat_minor": 2
|
|
}
|