Abstract:
A semiconductor processing method of forming a resistor from semiconductive material includes: a) providing a node to which electrical connection to a resistor is to be made; b) providing a first electrically insulative material outwardly of the node; c) providing an exposed vertical sidewall in the first electrically insulative material outwardly of the node; d) providing a second electrically insulative material outwardly of the first material and over the first material vertical sidewall, the first and second materials being selectively etchable relative to one another; e) anisotropically etching the second material selectively relative to the first material to form a substantially vertically extending sidewall spacer over the first material vertical sidewall and to outwardly expose the first material adjacent the sidewall spacer, the spacer having an inner surface and an outer surface; f) etching the first material selectively relative to the second material to outwardly expose at least a portion of the spacer outer surface; g) providing a conformal layer of a semiconductive material over the exposed outer spacer surface and over the inner spacer surface, the conformal layer making electrical connection with the node; and h) patterning the conformal layer into a desired resistor shape. SRAM and other integrated circuitry incorporating this and other resistors is disclosed.
Abstract:
A method is described for forming a structure by redepositing a starting material (5) on sidewalls of a foundation (15) during an etch of the starting material. The starting material can be a layer of conductive material formed into an electrode of a capacitor. Multiple layers of conductive material (50, 55) and dielectric material (60) can be etched to form a multilayered structure, such as a capacitor.
Abstract:
Semiconductor memory devices and methods for forming the devices are disclosed. In one embodiment, the devices include a) a semiconductor substrate (11); b) a field effect transistor gate (14) positioned outwardly of the semiconductor substrate; c) opposing active areas (24, 26) formed within the semiconductor substrate on opposing sides of the gate; d) a capacitor electrically connected with one of the active areas; the capacitor comprising an inner storage node (36), a capacitor dielectric layer (38), and an outer cell node (40); the inner storage node electrically connecting with the one active area and physically contacting the one active area; e) a bit line (46); f) a dielectric insulating layer (44) positioned intermediate the bit line and the other active area; and g) an electrically conductive bit line plug (36, 38, 40, 39) extending through the insulating layer to contact with the other active area and electrically interconnect the bit line with the other active area. Constructions in which the bit line plug comprises an electrically conductive annular ring are also disclosed.
Abstract:
A synchronous SRAM module comprises first and second SRAM chips. Each SRAM chip has three chip enable inputs. A module enable and memory selection circuit is coupled to the two SRAM chips to perform the dual tasks of (1) selectively enabling or disabling both SRAM chips and (2) choosing either the first or second SRAM chips for access. The SRAM module can also be placed in a pipelining mode where external signals from a microprocessor are ignored to facilitate internal operation, such as burst reads. A synchronous burst SRAM device employed in the SRAM module is also described.
Abstract:
An integrated circuit memory device is designed to perform high speed data write cycles. An address strobe signal is used to latch a first address. During a burst access cycle the address is incremented internal to the device with additional address strobe transitions. A new memory address is only required at the beginning of each burst access. Read/Write commands are issued once per burst access eliminating the need to toggle the Read/Write control line at the device cycle frequency. A transition of the Read/Write control line during a burst access is used to terminate the burst access and initialize the device for another burst access. Write cycle times are maximized to allow for increases in burst mode operating frequencies. Local logic gates near array sense amplifiers are used to control write data drivers to provide for maximum write times without crossing current during input/output line equilibration periods. By gating global write enable signals with global equilibrate signals locally at data sense amp locations, local write cycle control signals are provided which are valid for essentially the entire cycle time minus an I/O line equilibration period in burst access memory devices. For nonburst mode memory devices such as EDO and Fast Page Mode, the write function may begin immediately following the end of the equilibration cycle to provide a maximum write time without interfering with the address setup time of the next access cycle.
Abstract:
A method of forming a contact area between two vertical structures. A first layer of material conforming to and extending between vertical sidewalls is covered with a mask layer. The mask layer is patterned and etched to remove the horizontal region of the mask layer between the vertical sidewalls, thereby exposing the first layer of material at the desired location of the contact area, while retaining at least a portion of the vertical regions of the mask layer. Using the remaining vertical regions off the mask layer as an etch mask, the exposed portions of the first layer are then etched away to form the contact area. Another aspect of the invention provides a method of making a DRAM that utilizes a capacitor insulating layer over the capacitor second conductor (or cell poly) to self-align the bit line contact to the capacitor second conductor. In accordance with this aspect of the invention, a capacitor is formed over a semiconductor wafer. The capacitor includes a first conductor, a dielectric layer on the first conductor and a second conductor on the dielectric layer. A capacitor insulating layer is formed on the second conductor. The capacitor insulting layer is patterned and etched to expose portions of the second conductor at the desired location of the bit line contact. Then, using the capacitor insulating layer as a hard mask, the exposed portions of the second conductor are etched away in the area in which the bit line contact will subsequently be formed.
Abstract:
A block transfer register scoreboard unit (16) for data processing systems that not only minimizes no-operation (NOP) instructions, but also permits the processor's register file (14) to be operated as a double-buffered memory, with the processor's execution unit (15) processing one block of registers in the register file (14) simultaneously with the data load-store unit (17) performing a memory-to-register file transfer operation. Scoreboard unit architecture supports both block transfer load operations, as well as those of the single transfer load type. Such an architecture permits block transfer data load and store operation, as well as execution unit or program control unit instructions to operate in parallel, thus permitting a high-speed data processor to execute multiple instructions during a single machine clock cycle. The scoreboard unit (16) is sufficiently compact to enable implementation on a microprocessor chip.
Abstract:
A high-speed circuit that performs unsigned mode, two's complement mode, and two types of mixed mode multiplication-accumulation with equal facility. The circuit is an array (10) constructed from ten different adder elements (FA1S, FA1A, FA2A, FAC, FACA, FACC, FAAC, FAAC3, HAC, and HAC2, which correspond to Figures 13-22, respectively). The array has two multiplier input operands (X and Y) and one accumulator term (Z), the three of which may be expressed as binary power expansions. Final addition of sumout and carryout terms of the array (10) is performed by final adder (11), which may comprise any of several possible adder configurations, including full carry lookahead, carry select, and conditional-sum type adders. Speed is accomplished through the use of high-speed adder elements having few gate delays, and by summing all even array rows together and all odd rows together, then adding the even sum with the odd sum in the final adder (11) using a Wallace tree technique. The circuit incorporates a high degree of regularity and interconnectivity, which facilitates compact circuit layout.