ROM Memory - Revizia istoricului

Cbira: Cbira a redenumit pagina ROM Memory. în ROM Memory

2018-05-11T18:16:33Z

Cbira a redenumit pagina ROM Memory. în ROM Memory

Cbira: /* Implementing a ROM memory */

2018-04-12T08:13:40Z

Implementing a ROM memory

Cbira: /* Interface of a ROM memory */

2018-04-12T08:12:27Z

Interface of a ROM memory

Cbira: /* Interface of a ROM memory */

2018-04-12T08:12:12Z

Interface of a ROM memory

Cbira la 12 aprilie 2018 08:11

2018-04-12T08:11:35Z

Cbira: /* Implementing a ROM memory */

2018-04-12T07:55:02Z

Implementing a ROM memory

Cbira: /* Implementing a ROM memory */

2018-04-12T07:54:52Z

Implementing a ROM memory

Cbira: /* Implementing a ROM memory */

2018-04-12T07:54:43Z

Implementing a ROM memory

Cbira: /* Interface of ROM ROM */

2018-04-12T07:54:02Z

Interface of ROM ROM

Cbira: /* Interface of ROM ROM */

2018-04-12T07:53:33Z

Interface of ROM ROM

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 == Implementing a ROM memory ==
-Being a combined circuit in [[Verilog]], deploying a ROM can be done in three ways:
+Being a combinational circuit in [[Verilog]], deploying a ROM can be done in three ways:
 * with blocks '''assign''' and '''conditional operator''';
 * with blocks '''always''' combinational and sub-blocks '''if''';

← Versiunea anterioară		Versiunea de la data 12 aprilie 2018 08:12
Linia 12:		Linia 12:

	[[File: rom1.png \| ROM example (diagram)]]		[[File: rom1.png \| ROM example (diagram)]]
		+
	Example of a ROM memory of 16 locations each of 8 bits		Example of a ROM memory of 16 locations each of 8 bits

← Versiunea anterioară		Versiunea de la data 12 aprilie 2018 08:12
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	[[File: rom1.png \| ROM example (diagram)]]		[[File: rom1.png \| ROM example (diagram)]]
		+	Example of a ROM memory of 16 locations each of 8 bits

	== Implementing a ROM memory ==		== Implementing a ROM memory ==

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 Most functions implemented by [[combinational circuits]] can be described analytically, ie the output can be calculated by applying operators (addition, subtraction, shift, logic operations) of the inputs. Such functions are those that you have implemented in lab 1 and 2. However, there are cases where there is no clear relationship between the input value and the output value, so a rule can not be applied for calculating the latter. In this case, the solution is to use a Read-Only Memory (ROM), also called the Lookup Table (LUT), which has the role of storing the corresponding output value for each input value.
-== Interface of ROM ROM ==
+== Interface of a ROM memory ==
 [[File: rom0.png | thumb | ROM interface]]

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 * with blocks '''assign''' and '''conditional operator''';
 * with blocks '''always''' combinational and sub-blocks '''if''';
-* with ''' always''' blocks' and '''case''' blocks.
+* with ''' always''' blocks and '''case''' blocks.
 The preferred method is the last because of the ease of the description (see [[Verilog #Blocks and Conditional Operators | Conditional Operators]]).

← Versiunea anterioară	Versiunea de la data 11 mai 2018 18:16
(Nicio diferență)

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 #bit number of the output port (equal to the number of bits of each memory location), denoted N;
-'''Note:''' If the input port has M bits, then the total number of possible addresses or the total number of ROM locations is '''2 <sup> M </sup>'''. So the total number of ROMs (memory capacity) is the product of the total number of locations ('''2 <sup> M </sup>''') and the bit size of a location (''').
+'''Note:''' If the input port has M bits, then the total number of possible addresses or the total number of ROM locations is '''2 <sup> M </sup>'''. So the total number of ROMs (memory capacity) is the product of the total number of locations ('''2 <sup> M </sup>''') and the bit size of a location ('''N''').
 [[File: rom1.png | ROM example (diagram)]]

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 [[File: rom0.png | thumb | ROM interface]]
-A ROM, as a circuit, has a single input, which specifies the input value, and a single output on which the function value for the specified input propagates. For each entry value, a ROM has a memory location that is accessed when the corresponding value appears on the input port. The location value is propagated to the output port. Thus, a ROM has''' two important parameters' ':
+A ROM, as a circuit, has a single input, which specifies the input value, and a single output on which the function value for the specified input propagates. For each entry value, a ROM has a memory location that is accessed when the corresponding value appears on the input port. The location value is propagated to the output port. Thus, a ROM has''' two important parameters:
 #the bit number of the input port (representing the memory address), which determines the total number of memory locations, denoted M;
 #bit number of the output port (equal to the number of bits of each memory location), denoted N;
-'''Note:''' If the input port has M bits, then the total number of possible addresses or the total number of ROM locations is '''2 <sup> M </sup>'''. So the total number of ROMs (memory capacity) is the product of the total number of locations ('''2 <sup> M </sup>' ') and the bit size of a location (''').
+'''Note:''' If the input port has M bits, then the total number of possible addresses or the total number of ROM locations is '''2 <sup> M </sup>'''. So the total number of ROMs (memory capacity) is the product of the total number of locations ('''2 <sup> M </sup>''') and the bit size of a location (''').
 [[File: rom1.png | ROM example (diagram)]]