Enumeration literal

SUB" is an enumeration literal defined in type "CHARACTER" in the package "STANDARD" which is implicitly visible in all VHDL designs. Since this definition as well as the component declaration for "SUB" are both visible in the code, a homograph is reported. You can explicitly avoid this ambiguity as follows... 

A constant is a static object and so may be used in such a case. Also, integer and based literals (Chapter 6) and enumeration literals are static values. Signals and variables are dynamic objects. 

Others also exist but are not defined for use in synthesizeable descriptions- Note that when numerals are used as identifiers they must be written as 0 and not simply 0, as this is an integer value and not an enumerate literal. 

Each enumeration literal represents a different value, and this value is determined by the position of the literal in the set. The first in the list is assigned the value 0, the second 1, and so on. In the synthesizer, these values are of course implemented in their binary form. Hence, an enumeration type containing four literals is represented by two bits, but five literals would require three bits. 

The enumeration literal can be an identifier (e.g. RED, Blue, green) or a character literal (e.g. V, X, ). Eadi must be unique within the type declaration. Identifiers (simple names) are discussed in detail in Chapter 4. 

The same enumeration literal can appear in more than one type declaration. In such cases it may be necessary to clarify the e being used in a particular context. A qualified expression can be used for this purpose. 

String literals can generally only be used in synthesis if each character of the string represents a discrete enumeration literal and hence a single bit encoded value. Hence, an array of type BCX)LEAN could be formed using aggregates but not strings as illustrated below. 

As the above example demonstrates, ambiguous expressions that need qualifying usually occur because the same enumeration literal(s) occurs in more than one type declaration. 

In addition to the kinds of activity enumerated above, the highly methoxylated bioflavonoids exhibit a rather strong antibacterial, antifungal, antiviral activity (82-86). The compounds have shown inhibitory activity against organisms such as E. coll, Typhi, Salmonella Typhi, Shigella Dysenteriae, Staphylococcus, B. Abortus Bang, influenza Virus A and rhinoviruses. Some of the compounds were active in concentrations as low as 2.5 pg per liter. 

One liter in situ samples directly taken on-site, were concentrated by the membrane filtration method for enumerating nannoplankton. A measured volume of a well-mixed sample (20 -100 mL, depending on the number concentration of algae) was filtered at a constant suction rate through a membrane filter having a pore diameter of 0.45 um. The algae collected on the membrane were identified and counted by means of optical compound microscopy. If the identification after membrane filtration is too difficult as a result of alteration of cell shape, the above mentioned settling chamber technique is used. 

For GAnB enumeration, a medium was prepared under anaerobic conditions with the following composition (per liter) glucose, 5.0 g peptone, 4.0 g yeast extract, 1.0 g resazurin 4 ml (0.025% m/v), at pH 7.6. After preparation, the medium was distributed into 9 ml flasks and sterilized in an autoclave at 121 °C for 20 min. Then, sodium thioglycolate (12.4 g/I) was added, as previously described. 

Having established a (quasi-) legal basis for their activities and a mechanism for implementing their decisions, the corporate owners were in an excellent position to exploit their power. They did this indirectly, however, for the sake of appearances in the public arena and perhaps more importantly, to sustain a contented work force. Pitched battles with workers were not in the owner s best interests, so control mechanisms were literally built into the social fabric and physical environment of Appalachian coal towns like Benham and Lynch. In the balance of this section, we will enumerate a dozen examples. 

Another problem will arise if different versions of the operator function exist for enumeration types which contain literals that are identical. The... 

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