Abstract: A snooper of a processing unit connected to processing units via a system fabric receives a first single bus command in a bus protocol that allows sampling over the system fabric of the capability of snoopers to handle an interrupt and returns a first response indicating the capability of the snooper to handle the interrupt. The snooper, in response to receiving a second single bus command in the bus protocol to poll a first selection of snoopers for an availability status to service a criteria specified in the second single bus command, returns a second response indicating the availability of the snooper to service the criteria. The snooper, in response to receiving a third single bus command in the bus protocol to direct the snooper to handle the interrupt, assigns the interrupt to a particular processor thread of a respective selection of the one or more separate selections of processors threads distributed in the processing unit.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: A snooper of a processing unit connected to processing units via a system fabric receives a first single bus command in a bus protocol that allows sampling over the system fabric of the capability of snoopers to handle an interrupt and returns a first response indicating the capability of the snooper to handle the interrupt. The snooper, in response to receiving a second single bus command in the bus protocol to poll a first selection of snoopers for an availability status to service a criteria specified in the second single bus command, returns a second response indicating the availability of the snooper to service the criteria. The snooper, in response to receiving a third single bus command in the bus protocol to direct the snooper to handle the interrupt, assigns the interrupt to a particular processor thread of a respective selection of the one or more separate selections of processors threads distributed in the processing unit.

Abstract: A processing unit connected via a system fabric to multiple processing units calls a first single command in a bus protocol that allows sampling over the system fabric of the capability of snoopers distributed across the processing units to handle an interrupt. The processing unit, in response to detecting at least one first selection of snoopers with capability to handle the interrupt, calling a second single command in the bus protocol to poll the first selection of snoopers over the system fabric for an availability status. The processing unit, in response to detecting at least one second selection of snoopers respond with the available status indicating an availability to handle the interrupt, assigning a single snooper from among the second selection of snoopers to handle the interrupt by calling a third single command in the bus protocol.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: A processing unit connected via a system fabric to multiple processing units calls a first single command in a bus protocol that allows sampling over the system fabric of the capability of snoopers distributed across the processing units to handle an interrupt. The processing unit, in response to detecting at least one first selection of snoopers with capability to handle the interrupt, calling a second single command in the bus protocol to poll the first selection of snoopers over the system fabric for an availability status. The processing unit, in response to detecting at least one second selection of snoopers respond with the available status indicating an availability to handle the interrupt, assigning a single snooper from among the second selection of snoopers to handle the interrupt by calling a third single command in the bus protocol.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: A technique for handling interrupts in a data processing system includes receiving, by an interrupt routing controller (IRC), an event routing message (ERM) that includes an event source number for a notification source with an unserviced interrupt. In response to receiving the ERM, the IRC builds an event notification message (ENM) based on the event source number. The IRC determines a scope for the ENM based on an event target group (ETG) associated with the event source number. The IRC issues the ENM to an interrupt presentation controller (IPC) at the scope associated with the ETG.

Abstract: System, computer program product, and computer-implemented method to improve a running disparity of an encoded bit stream in a distributed network switch, the distributed network switch comprising a plurality of switch modules including a first switch module, by receiving, at the first switch module, a raw data stream comprising a plurality of bits, receiving a bit sequence, encoding at least a first bit of the raw data stream using a corresponding at least a first bit of the bit sequence, transmitting the encoded first bit, inverting the first bit of the bit sequence, and encoding a second bit of the raw data stream using the inverted first bit.

Abstract: System, computer program product, and computer-implemented method to improve a running disparity of an encoded bit stream in a distributed network switch, the distributed network switch comprising a plurality of switch modules including a first switch module, by receiving, at the first switch module, a raw data stream comprising a plurality of bits, receiving a bit sequence, encoding at least a first bit of the raw data stream using a corresponding at least a first bit of the bit sequence, transmitting the encoded first bit, inverting the first bit of the bit sequence, and encoding a second bit of the raw data stream using the inverted first bit.

Abstract: System, computer program product, and computer-implemented method to improve a running disparity of an encoded bit stream in a distributed network switch, the distributed network switch comprising a plurality of switch modules including a first switch module, by receiving, at the first switch module, a raw data stream comprising a plurality of bits, receiving a bit sequence, encoding at least a first bit of the raw data stream using a corresponding at least a first bit of the bit sequence, transmitting the encoded first bit, inverting the first bit of the bit sequence, and encoding a second bit of the raw data stream using the inverted first bit.

Abstract: System, computer program product, and computer-implemented method to improve a running disparity of an encoded bit stream in a distributed network switch, the distributed network switch comprising a plurality of switch modules including a first switch module, by receiving, at the first switch module, a raw data stream comprising a plurality of bits, receiving a bit sequence, encoding at least a first bit of the raw data stream using a corresponding at least a first bit of the bit sequence, transmitting the encoded first bit, inverting the first bit of the bit sequence, and encoding a second bit of the raw data stream using the inverted first bit.

Abstract: A technique for accessing a memory array includes receiving, from multiple requesters, memory access requests directed to a single port of the memory array. The memory access requests associated with each of the multiple requesters are serviced, based on a priority assigned to each of the multiple requesters, while maintaining a fixed timing for the memory access requests.

Abstract: A data capture technique for high speed signaling to allow for optimal sampling of an asynchronous data stream. This technique allows for extremely high data rates and does not require that a clock be sent with the data as is done in source synchronous systems. The present invention also provides a hardware mechanism for automatically adjusting transmission delays for optimal two-bit simultaneous bi-directional (SiBiDi) signaling.

Abstract: A design structure includes a data communication circuit to facilitate communication between a deserializer, responsive to a serial data stream, which puts data onto a parallel bus, and a device that is in data communication therewith. The circuit a deserialization clock that asserts a clock read pulse each time data on the parallel bus is valid. A delay unit asserts a corresponding delayed clock pulse. The delayed clock pulse is delayed from the clock read pulse by a predetermined period. A clock tree repeats the delayed clock pulse and periodically asserts a plurality of end point repeated clock pulses, each of which has a substantially simultaneous leading edge. The predetermined amount of time is selected so as to cause each of the end point repeated clock signals to be asserted when data on the parallel bus is valid, thereby enabling the device to read data from the parallel bus.

Abstract: A method is provided for processing commands issued by a processor over a bus. The method includes the steps of (1) transmitting the command to a remote node to obtain access to data required to complete the command; (2) receiving from the remote node a response packet including a header and a header CRC; (3) validating the response packet based on the header CRC; and (4) before receiving the data required to complete the command, arranging to return the data to the processor over the bus.

Abstract: A method is provided for processing a command issued by a processor over a bus. The method includes (1) transmitting the command to a remote node to obtain access to data required to complete the command; (2) receiving from the remote node a response packet including a header and a header CRC; (3) validating the response packet including the header and the header CRC; (4) loading a timer to run until data required to complete the command is received or the timer expires; and (5) before receiving the data required to complete the command, arranging to return the data to the processor over the bus.

Abstract: In one aspect, a processor is provided. The processor may include logic, coupled to the processor, and to issue a currently issued memory fetch over a processor bus. The currently issued memory fetch may include a next fetch hint that may include information about a next memory fetch.