The VHDL Cookbook phần 10 potx
The VHDL Cookbook phần 10 potx
... DP32. 7-54 The VHDL Cookbook always required. If the branch is not taken, the PC must be incremented to point to the instruction after the displacment. The timing for this is shown in Figure7-32. The ... onto the op1 bus, and the ALU function is set to incr1. This increments the value and places it on the result bus. Then during the second half of the cycle, th...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 1 ppt
... connected to the clock port of the count2 entity, and its q port connected to the internal signal ff0. The last two signal assignments update the entity ports whenever the values on the internal signals ... declared. Each of the components is then instantiated, and the ports of the instances are mapped onto signals and ports of the entity. For example, bit_0 is an inst...
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
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...
Ngày tải lên: 08/08/2014, 03:20
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 ... ns; were executed. The two new transactions are added to the projected output waveform: 4-4 The VHDL Cookbook on any of these signals (that is, the value of th...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 5 pot
... 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 are the only signals ... with an empty array as the parameter, and should handle that case appropriately. The example above handles it by returning the value H, the pulled-up value. 7-2 The VHDL...
Ngày tải lên: 08/08/2014, 03:20
The VHDL Cookbook phần 6 pptx
... 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. The memory 7 -10 The VHDL Cookbook use ... 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...
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...
Ngày tải lên: 08/08/2014, 03:20
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 ... instruction fetch. the incremented PC value on the result bus. This is then latched back into the PC register during the second half of the cycle. The fetch_2 pr...
Ngày tải lên: 08/08/2014, 03:20