Abstract:
An architecture (200) for distributing digital information to subscriber units (202) wherein selection from among multiple digital services is accomplished by transmitting a tuning command from a subscriber unit to an intermediate interface (206). The intermediate interface (206) selects the desired service from a broadband network and transmits it to the subscriber unit (202) over a bandwidth-constrained access line. The bandwidth-constrained access line may be implemented with existing infrastructure, yet the subscriber unit (202) may access a wide variety of digital information available on the broadband network. Universal broadband access is thus provided at low cost. Output bandwidth of broadcast equipment may also be optimized.
Abstract:
Apparatus for detecting and executing trapping program instructions in a superscalar processor operating on a plurality of pipelined instructions includes a fetch stage for fetching consecutive instructions from an instruction cache (210) or from main memory, an instruction FIFO memory (220) for storing fetched instructions from the fetch stage, and an instruction decode stage (230) for removing instructions from the FIFO memory (220) in accordance with relative ages of instructions stored in the FIFO memory (220). The decode stage examines instructions removed from the FIFO memory (220) for trapping conditions, and flushes all younger instructions from the FIFO memory (220) in response to identification of a trap in an instruction. The decode stage (230) distinguishes between hardware traps and software traps. A software trapping instruction is forwarded to an execute stage for execution. The decode stage (230) immediately causes the fetch address to be changed to the appropriate trap handler address.
Abstract:
A counter system has a first counter (1) seeded by several input signals and a second counter (2) seeded by at least a first output from the first counter. A selection signal is input to the second counter to select the use of either an interleaved count sequence or a sequential count sequence.
Abstract:
PROBLEM TO BE SOLVED: To test the pixel sensor circuit in an image array independently of the strength of image illuminance. SOLUTION: A drive voltage as to a reset FET 32 is provided selectively through a common output line. When no row access enable signal is applied to an array, a control enable test voltage is fed to a common line. A column line source follower circuit is controlled by a row access FET 40. Thus, another test voltage is fed to the common line through a reset switch and connected to a photodiode 38 via the reset FET 32. A variable reset voltage fed to a row line ROW is changed between a normal bias electrode VDD as to a pixel sensor and ground by using Pchannel and N-channel FETs connected in parallel.
Abstract:
PROBLEM TO BE SOLVED: To provide an ATM switch which has distributed buffering for higher performance and makes a larger design module. SOLUTION: An ATM switch has plural input and output ports 23 and 24 which are separately connected to input and output channels, a switch block 25 that is connected between them and a back pressure signal circuit. The input ports have input buffers 21 which hold a cell that arrives from the input channel earlier than the input port can transmit it, and the output ports have output buffers 22 which hold a cell when the cell arrives from the switch block earlier than the output ports can communicate it. The back pressure signal circuit sends a signal from a congested output buffer, makes the buffers of the input ports stop transmission and stores a cell that is estimated by the output buffers in the input port buffers.
Abstract:
PROBLEM TO BE SOLVED: To provide an ATM switch which quickly distributes buffering action, maximizes fast transmission of time critical data and minimizes transmission loss in a back pressure system. SOLUTION: An input port 23 transmits a cell from an input buffer in response to plural priority levels. Each output port 23 has an output buffer that retains a cell when the cell arrives from the input port faster than that the output port transmits it. The output port also transmits a cell from the output buffer in response to plural priority levels. A back pressure signal circuit sends a signal from the congested output buffer to the input buffer that just transmits a cell to the output buffer through a switch structure 10, and stops the transmission of the input port buffer. An ATM switch drops a cell based on previously connected reference more than a cell priority level. A penalty is imposed on a sender who makes congestion cause data more, than other users of the ATM switch.
Abstract:
PROBLEM TO BE SOLVED: To provide a computer system which provides additional performance as against a demand application only by adding a small hardware. SOLUTION: A slave device for a host computer system, for example, consists of the combination of an embedded programmable controler, a non-volatite memory, a local RAM and interface logic. The host computer system treats the slave device by assuming that it is a hierarchical memory system like a regular disk drive which stores and retrieves a file. Moreover, the host computer system can program the controller so as to operate stored information including an image processing and/or data compression. The non-volatile memory includes the disk drive, a writing possible CD-ROM, an optical disk or a non-volatile solid state memory.
Abstract:
PROBLEM TO BE SOLVED: To provide a flash memory operating at a lower potential. SOLUTION: The flash memory cell is appropriately manufactured in a silicon substrate 20. An N conductivity type silicon well 22 is formed in the P conductive type silicon made substrate 20. A P conductivity type well 24 is formed in the N well 22. For the ohmic contact with the P well 24, a region 28 additionally doped with a source 27 and a drain 26 is formed in the P well 24. Besides, a floating gate 29 and a control gate 21 are provided. Furthermore, a contact 25 to the N well 22 is provided for making feasible of the bias of the same.
Abstract:
PROBLEM TO BE SOLVED: To save the power consumption during the block write operation by freezing a normal writing data path during the block write cycle. SOLUTION: The video memory device is provided with a normal write mode and a block write mode, and also a large area writing driver for driving a large area input/output(I/O) line and many local writing drivers 120 are provided therein, and each local I/O line for driving is connected to a large number of memory cells. Then, a control circuit is connected to the large area writing driver 117 and the local writing drivers 120 to generate a block write signal and a normal write signal. The normal write data path is frozen by a block write control signal during the block write cycle, thereby the power consumption during the block write operation is saved.
Abstract:
PROBLEM TO BE SOLVED: To execute inverse discrete cosine transformation(IDCT) at high speed by multiplying a previous scaling coefficient to be changed according to the position of an input DCT coefficient in data to the coefficient on a 1st stage and performing multiplication due to a special IDCT coefficient matrix on a 2nd stage. SOLUTION: A multiplexer 104 sends DCT coefficient data to a matrix multiplier 106. In order to generate an intermediate output matrix, the multiplier 106 respectively multiplies the IDCT coefficient matrix to the respective rows of a DCT coefficient matrix. On an intermediate scaling/rounding stage 112, suitable bit precision is allocated to the intermediate output matrix, and the intermediate output matrix is transferred by a transfer buffer 114. The multiplexer 104 selects the intermediate matrix as the input to the multiplier 106. The multiplier 106 multiplies a T coefficient matrix to the intermediate output matrix for each row. On a stage 108, bit precision is allocated to the output matrix.