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xspice/icm/digital, introduce d_lut
xspice/icm/digital, introduce d_lut
a digital n-input look-up table gatepre-master-46
Tim Edwards
10 years ago
committed by
rlar
rlar
4 changed files with 335 additions and 0 deletions
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253src/xspice/icm/digital/d_lut/cfunc.mod
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77src/xspice/icm/digital/d_lut/ifspec.ifs
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1src/xspice/icm/digital/modpath.lst
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4visualc/xspice/digital.vcxproj
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/*.......1.........2.........3.........4.........5.........6.........7.........8 |
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================================================================================ |
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FILE d_lut/cfunc.mod |
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AUTHORS |
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25 Aug 2016 Tim Edwards efabless inc., San Jose, CA |
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SUMMARY |
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This file contains the functional description of the d_lut |
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code model. |
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LICENSE |
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This software is in the public domain. |
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INTERFACES |
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FILE ROUTINE CALLED |
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CMevt.c void *cm_event_alloc() |
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void *cm_event_get_ptr() |
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REFERENCED FILES |
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Inputs from and outputs to ARGS structure. |
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NON-STANDARD FEATURES |
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NONE |
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===============================================================================*/ |
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/*=== INCLUDE FILES ====================*/ |
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#include <stdio.h> |
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#include <ctype.h> |
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#include <math.h> |
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#include <string.h> |
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/*=== CONSTANTS ========================*/ |
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/*=== MACROS ===========================*/ |
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/*=== LOCAL VARIABLES & TYPEDEFS =======*/ |
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/*=== FUNCTION PROTOTYPE DEFINITIONS ===*/ |
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/*============================================================================== |
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FUNCTION cm_d_lut() |
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AUTHORS |
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25 Aug 2016 Tim Edwards |
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SUMMARY |
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This function implements the d_lut code model. |
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INTERFACES |
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FILE ROUTINE CALLED |
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CMevt.c void *cm_event_alloc() |
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void *cm_event_get_ptr() |
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RETURNED VALUE |
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Returns inputs and outputs via ARGS structure. |
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GLOBAL VARIABLES |
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NONE |
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NON-STANDARD FEATURES |
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NONE |
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==============================================================================*/ |
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/*=== CM_D_LUT ROUTINE ===*/ |
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/************************************************ |
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* The following is the model for the * |
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* digital n-input LUT gate * |
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* * |
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* Created 8/25/16 Tim Edwards * |
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************************************************/ |
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void cm_d_lut(ARGS) |
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{ |
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int i, /* generic loop counter index */ |
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j, /* lookup index bit value */ |
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idx, /* lookup index */ |
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size, /* number of input & output ports */ |
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tablelen; /* length of table (2^size) */ |
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char *table_string; |
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Digital_State_t *out, /* temporary output for buffers */ |
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*out_old, /* previous output for buffers */ |
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input, /* temp storage for input bits */ |
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*lookup_table; /* lookup table */ |
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/** Retrieve size value and compute table length... **/ |
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size = PORT_SIZE(in); |
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tablelen = 1 << size; |
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/*** Setup required state variables ***/ |
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if (INIT) { /* initial pass */ |
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/* allocate storage for the lookup table */ |
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STATIC_VAR (locdata) = calloc((size_t) tablelen, sizeof(Digital_State_t)); |
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lookup_table = STATIC_VAR (locdata); |
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/* allocate storage for the outputs */ |
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cm_event_alloc(0, sizeof(Digital_State_t)); |
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cm_event_alloc(1, size * (int) sizeof(Digital_State_t)); |
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/* set loading for inputs */ |
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for (i = 0; i < size; i++) |
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LOAD(in[i]) = PARAM(input_load); |
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/* retrieve storage for the outputs */ |
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out = out_old = (Digital_State_t *) cm_event_get_ptr(0, 0); |
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/* read parameter string into lookup table */ |
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table_string = PARAM(table_values); |
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for (idx = 0; idx < (int) strlen(table_string); idx++) { |
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if (idx == tablelen) |
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// If string is longer than 2^num_inputs, ignore |
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// the extra values at the end |
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break; |
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if (table_string[idx] == '1') |
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lookup_table[idx] = ONE; |
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else if (table_string[idx] == '0') |
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lookup_table[idx] = ZERO; |
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else |
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lookup_table[idx] = UNKNOWN; |
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} |
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// If string is shorter than 2^num_inputs, fill |
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// the remainder of the lookup table with UNKNOWN values. |
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for (; idx < tablelen; idx++) |
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lookup_table[idx] = UNKNOWN; |
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} |
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else { /* Retrieve previous values */ |
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/* retrieve lookup table */ |
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lookup_table = STATIC_VAR (locdata); |
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/* retrieve storage for the outputs */ |
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out = (Digital_State_t *) cm_event_get_ptr(0, 0); |
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out_old = (Digital_State_t *) cm_event_get_ptr(0, 1); |
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} |
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/*** Calculate new output value based on inputs and table ***/ |
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*out = ZERO; |
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j = 1; |
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idx = 0; |
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for (i = 0; i < size; i++) { |
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/* make sure this input isn't floating... */ |
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if (PORT_NULL(in) == FALSE) { |
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/* use inputs to find index into lookup table */ |
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if ((input = INPUT_STATE(in[i])) == UNKNOWN) { |
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*out = UNKNOWN; |
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break; |
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} |
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else if (input == ONE) { |
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idx += j; |
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} |
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j <<= 1; |
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} |
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else { |
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/* at least one port is floating...output is unknown */ |
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*out = UNKNOWN; |
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break; |
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} |
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} |
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if (*out != UNKNOWN) |
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*out = lookup_table[idx]; |
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/*** Determine analysis type and output appropriate values ***/ |
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if (ANALYSIS == DC) { /** DC analysis...output w/o delays **/ |
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OUTPUT_STATE(out) = *out; |
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} |
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else { /** Transient Analysis **/ |
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if (*out != *out_old) { /* output value is changing */ |
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switch (*out) { |
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/* fall to zero value */ |
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case 0: |
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OUTPUT_STATE(out) = ZERO; |
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OUTPUT_DELAY(out) = PARAM(fall_delay); |
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break; |
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/* rise to one value */ |
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case 1: |
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OUTPUT_STATE(out) = ONE; |
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OUTPUT_DELAY(out) = PARAM(rise_delay); |
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break; |
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/* unknown output */ |
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default: |
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OUTPUT_STATE(out) = *out = UNKNOWN; |
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/* based on old value, add rise or fall delay */ |
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if (0 == *out_old) |
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OUTPUT_DELAY(out) = PARAM(rise_delay); |
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else |
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OUTPUT_DELAY(out) = PARAM(fall_delay); |
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break; |
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} |
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} |
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else { /* output value not changing */ |
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OUTPUT_CHANGED(out) = FALSE; |
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} |
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} |
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OUTPUT_STRENGTH(out) = STRONG; |
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} |
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/*.......1.........2.........3.........4.........5.........6.........7.........8 |
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================================================================================ |
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AUTHORS |
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25 Aug 2016 Tim Edwards efabless inc., San Jose, CA |
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SUMMARY |
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This file contains the interface specification file for the |
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digital d_lut code model. |
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LICENSE |
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This software is in the public domain. |
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===============================================================================*/ |
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NAME_TABLE: |
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C_Function_Name: cm_d_lut |
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Spice_Model_Name: d_lut |
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Description: "digital n-input look-up table gate" |
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PORT_TABLE: |
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Port_Name: in out |
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Description: "input" "output" |
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Direction: in out |
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Default_Type: d d |
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Allowed_Types: [d] [d] |
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Vector: yes no |
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Vector_Bounds: [1 -] - |
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Null_Allowed: no no |
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PARAMETER_TABLE: |
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Parameter_Name: rise_delay fall_delay |
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Description: "rise delay" "fall delay" |
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Data_Type: real real |
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Default_Value: 1.0e-9 1.0e-9 |
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Limits: [1e-12 -] [1e-12 -] |
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Vector: no no |
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Vector_Bounds: - - |
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Null_Allowed: yes yes |
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PARAMETER_TABLE: |
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Parameter_Name: input_load |
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Description: "input load value (F)" |
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Data_Type: real |
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Default_Value: 1.0e-12 |
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Limits: - |
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Vector: no |
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Vector_Bounds: - |
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Null_Allowed: yes |
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PARAMETER_TABLE: |
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Parameter_Name: table_values |
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Description: "lookup table values" |
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Data_Type: string |
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Default_Value: "0" |
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Limits: - |
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Vector: no |
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Vector_Bounds: - |
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Null_Allowed: no |
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STATIC_VAR_TABLE: |
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Static_Var_Name: locdata |
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Description: "lookup table" |
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Data_Type: pointer |
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