The VHDL Cookbook phần 6 pptx
The VHDL Cookbook phần 6 pptx
... ready. The processor accepts the data, and completes the transaction. On the other hand, if the memory has not yet supplied the data by the end of the T2 state, it leaves ready false. The processor ... write. The read signal remains false for the whole transaction. During the T1 state, the processor also makes the data to be written available on the data bus....
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 2 pptx
... aggregate In the simplest case, the target of the assignment is an object name, and the value of the expression is given to the named object. The object and the value must have the same base type. 2-2 The ... choice others must be included as the last alternative. If no choice list includes the value of the expression, the others alternative is selected. If the...
Ngày tải lên: 08/08/2014, 03:20
Examples of VHDL Descriptions phần 6 pptx
... < 6) THEN first quarter period sinewave <= qrtrsine(i); ELSIF (i >= 6) AND (i < 11) THEN second quarter period sinewave <= qrtrsine(10-i); ELSIF (i >= 11) AND (i < 16) THEN ... defines the next state only begin if rst='1' then state <= state0; elsif (clk'event and clk='1') then case state is when state0 => if id = x"3&qu...
Ngày tải lên: 08/08/2014, 01:21
The VHDL Cookbook phần 1 ppt
... Buses 6- 1 6. 2. Null Transactions 6- 2 6. 3. Generate Statements 6- 2 6. 4. Concurrent Assertions and Procedure Calls 6- 3 6. 5. Entity Statements 6- 4 7. Sample Models: The DP32 Processor 7-1 7.1. Instruction ... Assignment 4 -6 5. Model Organisation 5-1 5.1. Design Units and Libraries 5-1 5.2. Configurations 5-2 5.3. Complete Design Example 5-5 6. Advanced VHDL 6- 1 6. 1....
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 3 pps
... Furthermore, these items shadow any things with the same names declared outside the subprogram. When the subprogram is called, the statements in the body are executed until either the end of the ... the subprogram statement body, and may not be assigned to. The actual parameter associated with incr when the procedure is called must be an expression. Given the mode of t...
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The VHDL Cookbook phần 4 ppsx
... transactions on the signal reset, then suspends for the rest of the simulation. On the other hand, if there are references to signals in the waveform value expressions or conditions, then the wait statement ... output waveform: 4-4 The VHDL Cookbook on any of these signals (that is, the value of the signal changes), the process resumes and evaluates the condition. If...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 5 pot
... of the design. 6- 1 6. Advanced VHDL This chapter describes some more advanced facilities offered in VHDL. Although you can write many models using just the parts of the language covered in the ... may be used. The sensitivity list of the wait statement in the process includes all the signals which are actual parameters of mode in or inout in the procedure call. These...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 7 pps
... (continued). When the reset input is asserted, all of the control ports are returned to their initial states, the data bus driver is disconnected, and the PC register is cleared. The model then waits ... through to the reset handling code. The instruction fetch part is simply a call to the memory read procedure. The PC register is used to provide the address, the fetch f...
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The VHDL Cookbook phần 8 pps
... '1', the value of the d input is stored in the variable master_PC, but the output (if enabled) is driven from the previously stored value in slave_PC. Then when latch_en changes from 7-34 The VHDL ... be loaded from the result bus. The ALU condition flags are latched into the condition code (CC) register, and from there can be compared with the condition mask...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 9 ppsx
... is returned to the processor from the memory. The controller disables the PC from the op1 bus and the ALU from the result bus, and enables the data input buffer to accept memory data onto the result ... ALU_op_select_table := ( 16# 00# => add, 16# 01# => subtract, 16# 02# => multiply, 16# 03# => divide, 16# 10# => add, 16# 11# => subtract, 16# 12# =&g...
Ngày tải lên: 08/08/2014, 03:20