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-------------------------------------------------------------------------------
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--
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-- Copyright (C) 2013
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-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
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-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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--
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-------------------------------------------------------------------------------
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LIBRARY IEEE, common_pkg_lib;
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USE IEEE.STD_LOGIC_1164.ALL;
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USE IEEE.NUMERIC_STD.ALL;
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USE common_pkg_lib.common_pkg.ALL;
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USE common_pkg_lib.common_str_pkg.ALL;
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-- Purpose:
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-- . Dynamically map record-like field structures onto SLVs.
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-- Description:
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-- . The MM register is defined by mm_fields.vhd.
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-- . The MM register consists of "RO" = input fields (status) and "RW" = output fields (control) in
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-- arbitrary order. The entire register is kept in a word_arr slv. The functions can extract the
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-- "RO" fields into a slv_in and the "RW" fields into a slv_out. Hence the slv_in'LENGTH +
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-- slv_out'LENGTH = word_arr'LENGTH.
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--
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-- . Advantages:
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-- . Replaces non-generic (dedicated) records;
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-- . Field widths are variable
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-- Remarks:
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PACKAGE common_field_pkg IS
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CONSTANT c_common_field_name_len : NATURAL := 64;
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CONSTANT c_common_field_default_len : NATURAL := 256;
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TYPE t_common_field IS RECORD
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name : STRING(1 TO c_common_field_name_len);
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mode : STRING(1 TO 2);
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size : POSITIVE;
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default : STD_LOGIC_VECTOR(c_common_field_default_len-1 DOWNTO 0);
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END RECORD;
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TYPE t_common_field_arr IS ARRAY(INTEGER RANGE <>) OF t_common_field;
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FUNCTION field_name_pad(name: STRING) RETURN STRING;
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FUNCTION field_default(slv_in: STD_LOGIC_VECTOR) RETURN STD_LOGIC_VECTOR;
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FUNCTION field_default(nat_in: NATURAL) RETURN STD_LOGIC_VECTOR;
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FUNCTION field_map_defaults(field_arr : t_common_field_arr) RETURN STD_LOGIC_VECTOR; -- returns slv_out
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FUNCTION field_mode (field_arr : t_common_field_arr; name: STRING ) RETURN STRING;
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FUNCTION field_size (field_arr : t_common_field_arr; name: STRING ) RETURN NATURAL;
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FUNCTION field_hi (field_arr : t_common_field_arr; name: STRING ) RETURN INTEGER;
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FUNCTION field_hi (field_arr : t_common_field_arr; index: NATURAL ) RETURN NATURAL;
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FUNCTION field_lo (field_arr : t_common_field_arr; name: STRING ) RETURN NATURAL;
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FUNCTION field_lo (field_arr : t_common_field_arr; index: NATURAL ) RETURN NATURAL;
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FUNCTION field_slv_len (field_arr : t_common_field_arr ) RETURN NATURAL;
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FUNCTION field_slv_in_len (field_arr : t_common_field_arr ) RETURN NATURAL;
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FUNCTION field_slv_out_len (field_arr : t_common_field_arr ) RETURN NATURAL;
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FUNCTION field_nof_words (field_arr : t_common_field_arr; word_w : NATURAL ) RETURN NATURAL;
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FUNCTION field_map_in (field_arr : t_common_field_arr; slv : STD_LOGIC_VECTOR; word_w : NATURAL ; mode : STRING) RETURN STD_LOGIC_VECTOR; -- returns word_arr
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FUNCTION field_map_out (field_arr : t_common_field_arr; word_arr : STD_LOGIC_VECTOR; word_w : NATURAL ) RETURN STD_LOGIC_VECTOR; -- returns slv_out
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FUNCTION field_map (field_arr : t_common_field_arr; word_arr_in: STD_LOGIC_VECTOR; word_arr_out: STD_LOGIC_VECTOR; word_w : NATURAL) RETURN STD_LOGIC_VECTOR; -- returns word_arr
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FUNCTION field_ovr_arr(field_arr : t_common_field_arr; ovr_init: STD_LOGIC_VECTOR) RETURN t_common_field_arr;
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FUNCTION field_exists(field_arr : t_common_field_arr; name: STRING) RETURN BOOLEAN;
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FUNCTION field_arr_set_mode(field_arr : t_common_field_arr; mode : STRING) RETURN t_common_field_arr;
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FUNCTION sel_a_b(sel : BOOLEAN; a, b : t_common_field_arr ) RETURN t_common_field_arr;
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END common_field_pkg;
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PACKAGE BODY common_field_pkg IS
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FUNCTION field_name_pad(name: STRING) RETURN STRING IS
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BEGIN
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RETURN pad(name, c_common_field_name_len, ' ');
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END field_name_pad;
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FUNCTION field_default(slv_in: STD_LOGIC_VECTOR) RETURN STD_LOGIC_VECTOR IS
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BEGIN
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RETURN RESIZE_UVEC(slv_in, c_common_field_default_len);
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END field_default;
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FUNCTION field_default(nat_in: NATURAL) RETURN STD_LOGIC_VECTOR IS
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BEGIN
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RETURN TO_UVEC(nat_in, c_common_field_default_len);
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END field_default;
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FUNCTION field_map_defaults(field_arr : t_common_field_arr) RETURN STD_LOGIC_VECTOR IS
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VARIABLE v_slv_out : STD_LOGIC_VECTOR(field_slv_out_len(field_arr)-1 DOWNTO 0);
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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IF field_arr(f).mode="RW" THEN
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v_slv_out( field_hi(field_arr, field_arr(f).name) DOWNTO field_lo(field_arr, field_arr(f).name)) := field_arr(f).default(field_arr(f).size-1 DOWNTO 0);
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END IF;
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END LOOP;
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RETURN v_slv_out;
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END field_map_defaults;
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FUNCTION field_mode(field_arr : t_common_field_arr; name: STRING) RETURN STRING IS
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-- Returns the mode string of the passed (via name) field
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BEGIN
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IF field_exists(field_arr, name) THEN
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FOR i IN 0 TO field_arr'HIGH LOOP
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IF field_arr(i).name=field_name_pad(name) THEN
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RETURN field_arr(i).mode;
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END IF;
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END LOOP;
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ELSE
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RETURN "-1";
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END IF;
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END field_mode;
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FUNCTION field_size(field_arr : t_common_field_arr; name: STRING) RETURN NATURAL IS
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-- Returns the size of the passed (via name) field
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BEGIN
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FOR i IN 0 TO field_arr'HIGH LOOP
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IF field_arr(i).name=field_name_pad(name) THEN
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RETURN field_arr(i).size;
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END IF;
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END LOOP;
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END field_size;
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FUNCTION field_hi(field_arr : t_common_field_arr; name: STRING) RETURN INTEGER IS
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-- Returns the high (=left) bit range index of the field within the field_arr interpreted as concatenated IN or OUT SLV
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VARIABLE v_acc_hi : NATURAL := 0;
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BEGIN
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IF field_exists(field_arr, name) THEN
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FOR i IN 0 TO field_arr'HIGH LOOP
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IF field_arr(i).mode=field_mode(field_arr, name) THEN -- increment index only for the "RO" = IN or the "RW" = OUT
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v_acc_hi := v_acc_hi + field_arr(i).size;
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IF field_arr(i).name = field_name_pad(name) THEN
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RETURN v_acc_hi-1;
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END IF;
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END IF;
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END LOOP;
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ELSE --field does not exist; return -1 which results in null array
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RETURN -1;
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END IF;
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END field_hi;
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FUNCTION field_hi(field_arr : t_common_field_arr; index : NATURAL) RETURN NATURAL IS
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-- Returns the high (=left) bit range index of the field within the field_arr interpreted as concatenated SLV
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VARIABLE v_acc_hi : NATURAL := 0;
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BEGIN
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FOR i IN 0 TO index LOOP
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v_acc_hi := v_acc_hi + field_arr(i).size;
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IF i = index THEN
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RETURN v_acc_hi-1;
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END IF;
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END LOOP;
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END field_hi;
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FUNCTION field_lo(field_arr : t_common_field_arr; name: STRING) RETURN NATURAL IS
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-- Returns the low (=right) bit range index of the field within the field_arr interpreted as concatenated IN or OUT SLV
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VARIABLE v_acc_hi : NATURAL := 0;
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BEGIN
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IF field_exists(field_arr, name) THEN
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FOR i IN 0 TO field_arr'HIGH LOOP
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IF field_arr(i).mode=field_mode(field_arr, name) THEN -- increment index only for the "RO" = IN or the "RW" = OUT
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v_acc_hi := v_acc_hi + field_arr(i).size;
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IF field_arr(i).name = field_name_pad(name) THEN
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RETURN v_acc_hi-field_arr(i).size;
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END IF;
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END IF;
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END LOOP;
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ELSE
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RETURN 0;
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END IF;
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END field_lo;
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FUNCTION field_lo(field_arr : t_common_field_arr; index : NATURAL) RETURN NATURAL IS
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-- Returns the low (=right) bit range index of the field within the field_arr interpreted as concatenated SLV
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VARIABLE v_acc_hi : NATURAL := 0;
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BEGIN
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FOR i IN 0 TO index LOOP
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v_acc_hi := v_acc_hi + field_arr(i).size;
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IF i = index THEN
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RETURN v_acc_hi-field_arr(i).size;
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END IF;
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END LOOP;
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END field_lo;
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FUNCTION field_slv_len(field_arr : t_common_field_arr) RETURN NATURAL IS
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-- Return the total length of all fields in field_arr
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VARIABLE v_len : NATURAL := 0;
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BEGIN
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FOR i IN 0 TO field_arr'HIGH LOOP
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v_len := v_len + field_arr(i).size;
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END LOOP;
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RETURN v_len;
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END field_slv_len;
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FUNCTION field_slv_in_len(field_arr : t_common_field_arr) RETURN NATURAL IS
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-- Return the total length of the input fields in field_arr (= all "RO")
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VARIABLE v_len : NATURAL := 0;
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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IF field_arr(f).mode="RO" THEN
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v_len := v_len + field_arr(f).size;
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END IF;
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END LOOP;
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RETURN v_len;
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END field_slv_in_len;
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FUNCTION field_slv_out_len(field_arr : t_common_field_arr) RETURN NATURAL IS
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-- Return the total length of the output fields in field_arr (= all "RW")
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VARIABLE v_len : NATURAL := 0;
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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IF field_arr(f).mode="RW" THEN
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v_len := v_len + field_arr(f).size;
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END IF;
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END LOOP;
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RETURN v_len;
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END field_slv_out_len;
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FUNCTION field_nof_words(field_arr : t_common_field_arr; word_w : NATURAL) RETURN NATURAL IS
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-- Return the number of words (of width word_w) required to hold field_arr
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VARIABLE v_word_cnt : NATURAL := 0;
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VARIABLE v_nof_reg_words : NATURAL;
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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-- Get the number of register words this field spans
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v_nof_reg_words := ceil_div(field_arr(f).size, word_w);
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FOR w IN 0 TO v_nof_reg_words-1 LOOP
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v_word_cnt := v_word_cnt +1;
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END LOOP;
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END LOOP;
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RETURN v_word_cnt;
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END field_nof_words;
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FUNCTION field_map_in(field_arr : t_common_field_arr; slv: STD_LOGIC_VECTOR; word_w : NATURAL; mode : STRING) RETURN STD_LOGIC_VECTOR IS
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-- Re-map a field SLV into a larger SLV, support mapping both the slv_in or the slv_out that dependents on mode; each field starting at a word boundary (word_w)
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VARIABLE v_word_arr : STD_LOGIC_VECTOR(field_nof_words(field_arr, word_w)*word_w-1 DOWNTO 0) := (OTHERS=>'0');
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VARIABLE v_word_cnt : NATURAL := 0;
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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-- Only extract the fields that are inputs
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IF field_arr(f).mode=mode THEN -- if mode="RO" then slv = slv_in, else if mode="RW" then slv = slv_out
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-- Extract the field
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v_word_arr( v_word_cnt*word_w+field_arr(f).size-1 DOWNTO v_word_cnt*word_w) := slv( field_hi(field_arr, field_arr(f).name) DOWNTO field_lo(field_arr, field_arr(f).name) );
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END IF;
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-- Calculate the correct word offset for the next field
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v_word_cnt := v_word_cnt + ceil_div(field_arr(f).size, word_w);
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END LOOP;
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RETURN v_word_arr;
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END field_map_in;
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FUNCTION field_map_out(field_arr : t_common_field_arr; word_arr: STD_LOGIC_VECTOR; word_w : NATURAL) RETURN STD_LOGIC_VECTOR IS
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-- Reverse of field_map_in
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VARIABLE v_slv_out : STD_LOGIC_VECTOR(field_slv_out_len(field_arr)-1 DOWNTO 0) := (OTHERS=>'0');
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VARIABLE v_word_cnt : NATURAL := 0;
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BEGIN
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FOR f IN 0 TO field_arr'HIGH LOOP
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-- Only extract the fields that are outputs
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IF field_arr(f).mode="RW" THEN
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-- Extract the field
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v_slv_out( field_hi(field_arr, field_arr(f).name) DOWNTO field_lo(field_arr, field_arr(f).name)) := word_arr( v_word_cnt*word_w+field_arr(f).size-1 DOWNTO v_word_cnt*word_w);
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END IF;
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-- Calculate the correct word offset for the next field
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v_word_cnt := v_word_cnt + ceil_div(field_arr(f).size, word_w);
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END LOOP;
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RETURN v_slv_out;
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END field_map_out;
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FUNCTION field_map(field_arr : t_common_field_arr; word_arr_in: STD_LOGIC_VECTOR; word_arr_out: STD_LOGIC_VECTOR; word_w : NATURAL) RETURN STD_LOGIC_VECTOR IS
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-- Create one SLV consisting of both read-only and output-readback fields, e.g. as input to an MM reg
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VARIABLE v_word_arr : STD_LOGIC_VECTOR(field_nof_words(field_arr, word_w)*word_w-1 DOWNTO 0);
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VARIABLE v_word_cnt : NATURAL := 0;
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BEGIN
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-- Wire the entire SLV to the input SLV by default
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v_word_arr := word_arr_in;
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|
|
-- Now re-assign the words that need to be read back from word_arr_out
|
292 |
|
|
FOR f IN 0 TO field_arr'HIGH LOOP
|
293 |
|
|
IF field_arr(f).mode="RW" THEN
|
294 |
|
|
v_word_arr( v_word_cnt*word_w+field_arr(f).size-1 DOWNTO v_word_cnt*word_w):= word_arr_out( v_word_cnt*word_w+field_arr(f).size-1 DOWNTO v_word_cnt*word_w);
|
295 |
|
|
END IF;
|
296 |
|
|
-- Calculate the correct word offset for the next field
|
297 |
|
|
v_word_cnt := v_word_cnt + ceil_div(field_arr(f).size, word_w);
|
298 |
|
|
END LOOP;
|
299 |
|
|
RETURN v_word_arr;
|
300 |
|
|
END field_map;
|
301 |
|
|
|
302 |
|
|
FUNCTION field_ovr_arr(field_arr : t_common_field_arr; ovr_init: STD_LOGIC_VECTOR) RETURN t_common_field_arr IS
|
303 |
|
|
-- Copy field_arr but change widths to 1 to create a 1-bit override field for each field in field_arr.
|
304 |
|
|
VARIABLE v_ovr_field_arr : t_common_field_arr(field_arr'RANGE);
|
305 |
|
|
BEGIN
|
306 |
|
|
v_ovr_field_arr:= field_arr;
|
307 |
|
|
FOR i IN field_arr'RANGE LOOP
|
308 |
|
|
v_ovr_field_arr(i).size := 1;
|
309 |
|
|
v_ovr_field_arr(i).default := field_default(slv(ovr_init(i)));
|
310 |
|
|
END LOOP;
|
311 |
|
|
RETURN v_ovr_field_arr;
|
312 |
|
|
END field_ovr_arr;
|
313 |
|
|
|
314 |
|
|
FUNCTION field_exists(field_arr : t_common_field_arr; name: STRING) RETURN BOOLEAN IS
|
315 |
|
|
BEGIN
|
316 |
|
|
FOR i IN field_arr'RANGE LOOP
|
317 |
|
|
IF field_arr(i).name=field_name_pad(name) THEN
|
318 |
|
|
RETURN TRUE;
|
319 |
|
|
END IF;
|
320 |
|
|
END LOOP;
|
321 |
|
|
RETURN FALSE;
|
322 |
|
|
END field_exists;
|
323 |
|
|
|
324 |
|
|
FUNCTION field_arr_set_mode(field_arr : t_common_field_arr; mode : STRING) RETURN t_common_field_arr IS
|
325 |
|
|
VARIABLE v_field_arr : t_common_field_arr(field_arr'RANGE);
|
326 |
|
|
BEGIN
|
327 |
|
|
v_field_arr := field_arr;
|
328 |
|
|
FOR i IN field_arr'RANGE LOOP
|
329 |
|
|
v_field_arr(i).mode := mode;
|
330 |
|
|
END LOOP;
|
331 |
|
|
RETURN v_field_arr;
|
332 |
|
|
END field_arr_set_mode;
|
333 |
|
|
|
334 |
|
|
FUNCTION sel_a_b(sel :BOOLEAN; a, b : t_common_field_arr) RETURN t_common_field_arr IS
|
335 |
|
|
BEGIN
|
336 |
|
|
IF sel = TRUE THEN
|
337 |
|
|
RETURN a;
|
338 |
|
|
ELSE
|
339 |
|
|
RETURN b;
|
340 |
|
|
END IF;
|
341 |
|
|
END;
|
342 |
|
|
|
343 |
|
|
END common_field_pkg;
|