摘要:
A system and method for the storage of digital information wherein data that would normally be represented by multiple bits of information is effectively stored at single memory site within a ROM. This is accomplished by employing a multiple bit-line memory architecture, in conjunction with a data decoder. With this arrangement it is possible to store, at a single memory site, information that would have required up to .left brkt-top.log.sub.2 (n(n-1)/2)+1).right brkt-top. individual memory sites in a conventional ROM (where n is the number independent of bit-lines connected to an individual memory element in the invention). The invention is particularly well-suited to what would be considered relatively low-speed data retrieval systems, such as those adapted to provide audio and/or video to a user on a real time basis.
摘要:
Integrated circuit chips with two (or more) multi-element logic paths--suffering from signal skew operation because of semiconductor processing variations--can be made to exhibit substantially reduced skew by designing the elements such that the sum of the pull-up delays in one logic path is approximately equal to the sum of the pull-up delays in the other logic path (or in each of the other logic paths) and such that the sum of all the delays (pull-down plus pull-up) in one path is substantially equal to the sum of all the delays in (each of) the other(s)--all in response to an input signal transition (low to high, high to low, or both) applied to each path.
摘要:
An integrated circuit chip with a preferred ground structure and including only pull-down transistors (on-chip) is operated by means of an off-chip pull-up transistor arrangement for precharging the data bus to logic high. The arrangement exhibits relatively low noise characteristics allowing relatively high frequency operation without generating noise voltages which exceed FET threshold voltages.
摘要:
In an IGFET circuit having a long string of more than two transistors connected in series between an output terminal and a power supply terminal where the load capacitance across the output terminal is on the same order of magnitude as the parasitic capacitances at the junctures of the transistors in the string, the switching-delay is not significantly reduced by uniformly increasing the conduction channel widths of the transistors in the string. However, according to the present invention, a substantial reduction in the switching delay of such a circuit may be obtained by scaling the conduction channel widths of the transistors in the string so as to provide a positive gradient in conduction channel widths along the string in the direction from the output terminal to the power supply terminal. It is particularly advantageous to use exponential scaling of the conduction channel widths. The present invention is also applicable to transistor strings which include one or more groups of parallel connected transistors.
摘要:
A single-chip processor architecture is disclosed which permits the registers and control latches of the processor to be easily accessed without using instructions to achieve such access. The architecture provides for an internal access (IA) function which is enabled by applying an IA Request signal to an IA terminal of the processor. During the IA function, program execution in the processor is suspended and the registers and control latches may be accessed as if they were storage locations in a random access memory. After the IA function is enabled, the address of a register or control latch selected for access is applied to the Address/Data port of the processor, and an IA Control Code specifying the strobing of the Address/Data port is applied to the Status terminals of the processor. After strobing of the address, a second IA Control Code specifying either reading or writing of the selected register or control latch is applied to the Status terminals. If the second Control Code specifies reading, the contents of the selected register or control latch is provided at the Address/Data port. If the second Control Code specifies writing, data received at the Address/Data port is stored in the selected register. The IA function facilitates program development in the processor because it provides an efficient means for observing the internal machine states and register contents of the processor. Functional testing of the processor is also facilitated because the IA function increases the availability of the internal nodes of the processor chip for the application of test signals and for the observation of circuit responses.
摘要:
A CMOS integrated circuit structure having an improved guardband configuration for the prevention of parasitic SCR latchup. Included with each guardband is a pair of field reducing surface regions of the opposite conductivity type to that of the guardband and situated one on each side of the guardband adjacent thereto. The field reducing regions which are electrically connected to each other serve to reduce any electric fields in the bulk region underlying the guardband thereby significantly improving the effectiveness of the guardband for collecting minority carriers in the bulk region to provide greater protection from latchup.
摘要:
A main body chassis 101 in which a navigation side connector 109 is positioned and fixed, and a display part chassis 203 in which an LCD side connector 205 is positioned and fixed are positioned by abutting a pair of positioning bosses 116 of each of positioning parts 115a and 115b against both-shoulder portions 214 of each of positioning protruding pieces 211a and 211b, and are secured with screws; whether the navigation side connector 109 and the LCD side connector 205 are connected or not can be confirmed by presence or absence of a fitting between a fitting pawl 118 of the outer wall surface and a fitting hole 213.
摘要:
A main body chassis 101 in which a navigation side connector 109 is positioned and fixed, and a display part chassis 203 in which an LCD side connector 205 is positioned and fixed are positioned by abutting a pair of positioning bosses 116 of each of positioning parts 115a and 115b against both-shoulder portions 214 of each of positioning protruding pieces 211a and 211b, and are secured with screws; whether the navigation side connector 109 and the LCD side connector 205 are connected or not can be confirmed by presence or absence of a fitting between a fitting pawl 118 of the outer wall surface and a fitting hole 213.
摘要:
In gate-processed moldings fabricated by cutting off a gate 5 formed on resin moldings 1 during molding of the resin moldings 1, an introducing section 4 for cutting off the gate is formed thereon.
摘要:
A method for fabricating read-only memory ("ROM") devices utilizing junction field-effect transistors ("JFETs") having a conductive channel orthogonally oriented with respect to the surface of the semiconductor material composing the JFET. A fixed-position ion beam is employed to create this narrow gate channel, which extends between the JFET's source and drain contact. Employing such JFETs as basic memory sites within a semiconductor ROM circuit allows for an architecture that conforms to a minimum lattice structure layout. In addition, the resulting ROM offers high speed access of data. Although JFETs have not been utilized as the transistor of choice within ROMs because of their seemingly inferior performance when compared to MOSFETs, the invention provides a novel architecture which significantly enhances the practicality of the JFET as a memory device.