The VHDL Cookbook phần 9 ppsx
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
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
Embedded FreeBSD Cookbook phần 9 ppsx
... The next four bytes r epresent the LBA of the partition. The LBA is the sector offset from the beginning of the disk to the beginning of the partition. Length The last four bytes contain the ... of the sector. The lower 6 bits of the sector in offset 2 contain the sector within the cylinder. The address is the combination of the computed cylinder and...
Ngày tải lên: 07/08/2014, 23:20
The VHDL Cookbook phần 1 ppt
... systems with feedback, the outputs are also a function of time. VHDL solves this problem by allowing description of behaviour in the form The VHDL Cookbook First Edition July, 199 0 Peter J. Ashenden Dept. ... 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 whe...
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 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
... 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 7 pps
... comparing the condition code bits with the condition mask in the instruction, to determine whether the branch is taken. If it is, the PC register takes on the effective address value. The branch ... is used to provide the address, the fetch flag is true, and the result is returned into the current instruction register. The PC register is then incremented by one using...
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