摘要:
A clock control circuit 22 in a control circuit 21 provided in a transmitter 25 controls a gate circuit 12 based on an instruction from a microcomputer 32 to stop the output of the clock to a cable 115 for a first predetermined period of time. Then, a read-out circuit in the microcomputer 32 accesses an EDID 31 stored in an information storing circuit of a receiver 43 via the cable 115, and specifies the first predetermined period of time based on the EDID 31. A reconfiguration circuit 42 provided in the receiver 43 counts the clock-holding state, and resets at least one of the receiver 43 and a TV 114 if the clock has been stopped for a second predetermined period of time. This reset operation suppresses the display of noise on the TV 114. Therefore, the occurrence of noise due to mis-latching between the clock and the data can be reduced even after a signal switching that entails a change in the clock frequency.
摘要:
The present invention provides a transmitter capable of reducing the occurrence of noise when switching from the SD signal to the HD signal, for example. A microcomputer (151) controls a 10-times multiplication PLL (13) to increase the amount of jitter of a multiplied clock (CLK1×10) upon signal switching, i.e., when switching the frequency of an input clock (CLK1) from one to another. Alternatively, it controls a phase adjustment section (31) to increase the amount of jitter of a transmit clock (CLK2). Alternatively, it controls a fixed data producing section (61) to set transmit data (DATA2) to predetermined fixed data stored in a fixed data storing section (62).
摘要:
In a semiconductor integrated circuit, a detection confirmation circuit sets the logical level of a second signal according to the logical level of a first signal observed after a lapse of a predetermined time since detection of insertion/removal of a cable for peripheral equipment. The semiconductor integrated circuit operates in a standby mode in which only the insertion/removal detection circuit operates if no cable for peripheral equipment is connected, in a repeater mode in which only PHY operates if a cable for peripheral equipment is connected and CPU is in the suspended state, and in a normal mode in which both PHY and LINK operate if a cable for peripheral equipment is connected and a CPU is in the operating state.
摘要:
In a semiconductor integrated circuit, a detection confirmation circuit sets the logical level of a second signal according to the logical level of a first signal observed after a lapse of a predetermined time since detection of insertion/removal of a cable for peripheral equipment. The semiconductor integrated circuit operates in a standby mode in which only the insertion/removal detection circuit operates if no cable for peripheral equipment is connected, in a repeater mode in which only PHY operates if a cable for peripheral equipment is connected and CPU is in the suspended state, and in a normal mode in which both PHY and LINK operate if a cable for peripheral equipment is connected and a CPU is in the operating state.
摘要:
In a semiconductor integrated circuit apparatus, a first logic circuit processes a clock signal inputted through an external clock input terminal, and each of a plurality of second logic circuits processes the clock signal outputted from the first logic circuit, and outputs the processed clock signal to a plurality of flip-flops. In the semiconductor integrated circuit apparatus, an inner clock signal line is provided for electrically connecting the plurality of second logic circuits with the plurality of flip-flops, wherein the inner clock signal line is formed in a ring shape in the periphery of the semiconductor integrated circuit apparatus so that the plurality of flip-flops are located within the inner clock signal line, thereby reducing the clock skews therebetween in the semiconductor integrated circuit. Furthermore, an outer clock signal line is provided for electrically connecting the first logic circuit with the plurality of second logic circuits, and then the outer clock signal line is formed in a ring shape, thereby further reducing the clock skews therebetween in the semiconductor integrated circuit.
摘要:
A data transmitter includes a bus master circuit. The bus master circuit obtains the right to use a CPU bus and directly performs data transmission to and from a working memory connected to the CPU bus through a CPU interface section and the CPU bus.
摘要:
A data transmitter includes a bus master circuit. The bus master circuit obtains the right to use a CPU bus and directly performs data transmission to and from a working memory connected to the CPU bus through a CPU interface section and the CPU bus.
摘要:
In order to reduce load placed on a CPU (central processing unit) in providing SBP-2 (serial bus protocol 2) initiator capability, provided are a sequence control circuit activated by the CPU for controlling a command issue sequence, a packet processing circuit for assembling operation request blocks (ORB) into a transmission packet and extracting a status from a received packet; buffer for storing a command ORB provided by the CPU; a buffer for storing a management ORB provided by the CPU; a buffer for storing a status received for an issued management ORB and providing the status to the CPU; and a buffer for command for storing a status received for an issued command ORB and providing the status to the CPU.
摘要:
Reception buffer, transmission buffer, transmission-reception buffer, reception filter and transmission filter are provided. The reception filter determines where a received packet should be stored based on the contents of the received packet. Specifically, in executing a READ command, a response packet, which is returned in response to a data transmission packet, is detected by the reception filter. Received packets of the other types are stored on the reception buffer. In executing a WRITE command, a data request packet is transmitted from the transmission buffer. A data reception packet responding to the data request packet is stored by the reception filter on the transmission-reception buffer. Received packets of the other types are stored on the reception buffer. The capacity of the transmission-reception buffer is twice as large as the size of a maximum transferable packet. Thus, overhead can be reduced and yet data can be transferred at higher speeds.
摘要:
The multi-initiator control unit for performing packet-unit communication with each of a plurality of devices connected via a transmission line includes: a packet filter for analyzing a received packet and outputting the results; a plurality of command control circuits each for controlling a command processing sequence performed with the corresponding device; a multi-control circuit for giving sequence execution permission to one of the plurality of command control circuits; and a packet processing circuit for generating a packet containing information output by the permission-given command control circuit and outputting the packet for transmission, and also outputting a received packet according to the analysis results output by the packet filter.