The parallel-in, serial-out shift register is used in the output process for serial data.
A word is loaded (all at once) into the shift register from the computer.
Then, bits are sent to the modem from the right end of the shift register one at a time.
Parallel-in, parallel-out shift register chips are limited to 4 or 5 bits because of the number of connections required.
The 7495 is very similar to the 74166 in control structure, except that it has a separate clock input for shifting and for loading.
In most computers, there are both left and right shift and rotate* instructions.
To implement these, we might use a right/left shift register (such as the 74194, a synchronous parallel-in, parallel-out 4-bit shift register).
For this, a three-way multiplexer is needed at each bit, since that bit can receive the bit to its left, the bit to its right, or the input bit.
A truth table describing the behavior of the shift register is shown in Table 8.1.
Bits are numbered 1 to 4 from left to right.
The parallel-in, serial-out shift register is used in the output process for serial data. A word is loaded (all at once) into the shift register from the computer. Then, bits are sent to the modem from the right end of the shift register one at a time. Parallel-in, parallel-out shift register chips are limited to 4 or 5 bits because of the number of connections required. The 7495 is very similar to the 74166 in control structure, except that it has a separate clock input for shifting and for loading. In most computers, there are both left and right shift and rotate* instructions. To implement these, we might use a right/left shift register (such as the 74194, a synchronous parallel-in, parallel-out 4-bit shift register). For this, a three-way multiplexer is needed at each bit, since that bit can receive the bit to its left, the bit to its right, or the input bit.A truth table describing the behavior of the shift register is shown in Table 8.1. Bits are numbered 1 to 4 from left to right.
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