摘要:
A static CAM includes a plurality of entries E each including a number of CAM cells B and a summary S. Each CAM cell B is associated with a memory cell M and a comparator C. Generally, the CAM receives as input i number of lookup data lines. When data is received, memory cells M provide compared data for corresponding comparators C in CAM cells B to compare the compared data to the received data. If all compared data match all received data lines for an entry, then there is a hit for that entry. But if any compared data does not match the corresponding data line, then there is a miss for that line and therefore a miss for that entry. Depending on applications, the CAM returns an address if there is a hit for one or a plurality of entries.
摘要:
A voltage regulator circuit with high accuracy and Power Supply Rejection Ratio (PSRR) is provided. In one embodiment, an op-amp with a voltage reference input to an inverting input has the first output connected to a PMOS transistor's gate. The PMOS transistor's source and drain are each connected to the power supply and the voltage regulator output. The voltage regulator output is connected to an NMOS transistor biased in saturation mode and a series of two resistors. The non-inverting input of the op-amp is connected in between the two resistors for the first feedback loop. The op-amp's second output is connected to the gate of the NMOS transistor through an AC-coupling capacitor for the second feedback loop. The op-amp's first output can be connected to the power supply voltage through a capacitor to further improve high frequency PSRR. In another embodiment, the role of PMOS and NMOS transistors is reversed.
摘要:
An interleaved memory circuit includes a first memory bank having a first memory cell. A first local control circuit is coupled with the first memory bank. A second memory bank includes a second memory cell. A second local control circuit is coupled with the second memory bank. An IO block is coupled with the first memory bank and the second memory bank. A global control circuit is coupled with the first and second local control circuits. An interleaving access includes a clock signal having a first cycle and a second cycle for accessing the first memory cell and the second memory cell, respectively, wherein the second cycle is capable of enabling the first local control circuit to trigger a first transition of a first read column select signal RSSL for accessing the first memory cell.
摘要:
A representative memory device includes a cell array, at least one break cell that subdivides the cell array into bit cell arrays, and one or more power switches that are electrically coupled to the bit cell. In one embodiment, the break cell separates a connectivity of a first voltage and a second voltage between at least two bit cell arrays so that the bit cell arrays can be selectively coupled to either the first voltage or the second voltage using the power switches. The power switches control the connection of each separated bit cell array of the cell array to either the first voltage or second voltage.
摘要:
A method of designing a content-addressable memory (CAM) includes associating CAM cells with a summary circuit. The summary circuit includes a first level of logic gates and a second level of logic gates. The first level of logic gates have inputs each configured to receive an output of a corresponding one of the plurality of CAM cell. The second level of logic gates have inputs each configured to receive an output of a corresponding one of the first level of logic gates. Logic gates in at least one of the first level of logic gates or the second level of logic gates are selected to have an odd number of input pins so that an input pin and an output pin share a layout sub-slot.
摘要:
A circuit includes a fuse and a sensing and control circuit. The fuse is coupled between a MOS transistor and a current source node. The sensing and control circuit is configured to receive a programming pulse and output a modified programming signal to the gate of the MOS transistor for programming the fuse. The modified programming signal has a pulse width based on a magnitude of a current through the first fuse.
摘要:
An integrated circuit includes a static random access memory (SRAM) array coupled to a first voltage supply node and a second voltage supply node. The first and second voltage supply nodes provide a retention voltage across the SRAM array. A current limiter is disposed between the SRAM array and the first voltage supply node, and a voltage regulator is coupled in parallel with the current limiter between the SRAM array and the first voltage supply node. The voltage regulator is configured to maintain the retention voltage across the SRAM array above a predetermined level.
摘要:
A system and method for effectively implementing a high-speed DRAM device may include memory cells that each have a bitline for transferring storage data, a wordline for enabling an accelerated-write operation in the memory cell, and a data storage node with a corresponding cell voltage. An accelerated-write circuit may then directly provide the storage data to an appropriate bitline in a pre-toggled state in response to one or more accelerated-write enable signals. The corresponding cell voltage may therefore begin a state-change transition towards the pre-toggled state immediately after the wordline is activated to successfully reach a full-state level before the wordline is deactivated during a high-speed memory cycle.
摘要:
A voltage regulator circuit comprises an amplifier having an inverting input and a non-inverting input. The amplifier is configured to generate a control signal based on a reference signal at the inverting input of the amplifier and a feedback signal at the non-inverting input of the amplifier. The voltage regulator circuit also comprises an output node, a first power node, a second power node, and a driver that generates a driving current flowing toward the output node in response to the control signal. The driver is coupled between the first power node and the output node. A first transistor having a gate is coupled between the output node and the second power node. A bias circuit outside the amplifier supplies a bias signal to the gate of the first transistor, which is configured to operate in a saturation mode based on the bias signal supplied by the bias circuit.
摘要:
A semiconductor device has first and second interconnect structures in first and second columns, respectively, of an array. Each of the first and second interconnect structures has a reference voltage node and first, second, third, and fourth conductors that are coupled to each other and formed at a first layer, a second layer, a third layer, and a fourth layer, respectively, over a substrate having a plurality of devices defining a plurality of bit cells. The reference voltage node of each interconnect structure provides a respectively separate reference voltage to a bit cell corresponding to said interconnect structure. None of the first, second, third, and fourth conductors in either interconnect structure is connected to a corresponding conductor in the other interconnect structure. The second layer is above the first layer, the third layer is above the second layer, and the fourth layer is above the third layer.