摘要:
A protection circuit for a computer system having PCI expansion cards and PCI expansion slots with multiple power rails for supplying power to the PCI expansion cards, the protection circuit including a current monitor that monitors the current levels drawn by the PCI expansion card at each power rail; an inrush current controller for controlling the initial current applied to each of the power rails when an expansion card is initially inserted into an expansion slot; a voltage monitor that monitors the voltage levels applied to selected power rails; and a disconnector for disconnecting the power to the PCI expansion slot when either the current level drawn by the PCI expansion card at any of the power rails goes beyond a selected range or when the voltage levels at any of the selected monitored power rails are below a selected threshold or when commanded by the computer system.
摘要:
A method includes providing a bridge device (105) connected to a host computing device (101-1, 101-2) and a peripheral device (103-1, 103-2, 103-N, 403-1, 403-2, 405-1, 405-2, 405-3), the bridge device (105) being configured to communicatively couple the host device (101-1, 101-2) to the peripheral device (103-1, 103-2, 103-N, 403-1, 403-2, 405-1, 405-2, 405-3); and preventing execution of a hardware enumeration process (313) in the host device (101-1, 101-2) until completion of a resource allocation process (303) in the bridge device (105).
摘要:
A method for powering up a removable circuit card when it is inserted into a card slot of a computer system includes providing power and a clock signal to the circuit card. A communication link is electrically coupled to the circuit card after both the power and the clock signal are provided to the circuit card.
摘要:
A computer system has a skew compensation circuit for synchronizing the phase of a first periodic signal in one device with a second periodic signal in a second device connected to the first device by a connection that imposes a propagation delay. The skew compensation circuit has a receiver connected to receive the second periodic signal delayed by the propagation delay and circuitry for providing a delay signal representative of the propagation delay. The skew compensation circuit further includes a generator connected to generate the first periodic signal in phase with the second periodic signal based on the first periodic signal and the delay signal.
摘要:
A computer system has a central processing unit and a bus. A first bus device and a second bus device are connected to the bus. A circuit is connected to configure the second bus device to be addressable by the central processing unit via the bus only by interaction with the first bus device. The first bus device may be an I.sub.2 O processor, and the second bus device may be an I.sub.2 O subordinate bus device.
摘要:
A method and apparatus for host enumeration process. One embodiment of the method provides a bit to indicate to the host whether enumeration process should start or continue. The bit may be set when the shared resource process has been successfully completed, or the bit may be set if too much time has elapsed since the shared resource process has started, or the bit may be set if too much time has elapsed before the shared resource process is started, or the bit may be set if the shared resource process has not been performed successfully, or the bit may be set if the port is open and it is unnecessary to perform the shared resource process.
摘要:
A method determines actual power consumption for system power performance states (SPP-states) of a server. The method comprises initializing the server, performing a worst case workload test, measuring power consumption of the server at one or more SPP-states, and adjusting values in a lookup table to reflect the measured power consumption of the server.
摘要:
A method determines actual power consumption for system power performance states (SPP-states) of a server. The method comprises initializing the server, performing a worst case workload test, measuring power consumption of the server at one or more SPP-states, and adjusting values in a lookup table to reflect the measured power consumption of the server.
摘要:
In a system that executes the method according to the invention, each slot on the system bus is individually enabled at start-up and each address of an address range is read to determine whether an expansion board is installed in the slot and is responding to a read from that I/O address. If the data value returned by the I/O read is not equal to the undriven value of the data bus, then it is known that the expansion board is responding to that I/O address. Otherwise, a second read of the I/O address is performed, and the values of certain control lines on the system bus are latched to determine whether an expansion board is driving those lines in response to the I/O read. If so, again it is known that an expansion board is responding to a read from that I/O address. Otherwise, the system then performs a further special I/O read to determine the data bus response time. If the response time is faster than the response time of an undriven bus, it is known that an expansion board is responding to this I/O address. In this way, an I/O address map is created for each expansion board. This map is then used to determine the system configuration by comparing the map to standard signatures of known boards. The system configuration is the passed to standard configuration software.
摘要:
A method and apparatus for host enumeration process. One embodiment of the method provides a bit to indicate to the host whether enumeration process should start or continue. The bit may be set when the shared resource process has been successfully completed, or the bit may be set if too much time has elapsed since the shared resource process has started, or the bit may be set if too much time has elapsed before the shared resource process is started, or the bit may be set if the shared resource process has not been performed successfully, or the bit may be set if the port is open and it is unnecessary to perform the shared resource process.