摘要:
The contents of input time-division channels on a closed-loop link (10LO, 10HI) are stored in a memory (173) at the address supplied by an input address counter (IAC) controlled by an incoming timing signal (2MCR). The memory is read out under control of an output address counter (OAC) controlled by an outgoing timing signal (2MCT). Each time interval is divided into one read period and two write periods. Means (186) are provided to select one of the two write periods dependent on the phase relationship between the incoming and outgoing timing signals. The units connected in series by means of the closed-loop link receive a timing signal circulating on a timing loop (15) that is closed by a master timing device (13). Slave timing devices (18) inserted in the timing loop regenerate the timing signals circulating thereon and check same.
摘要:
In a shared memory system, wherein several memory users MU wish access to a plurality of memory banks, a set of high level commands (CREATE, PUT, GET, RELEASE) is provided, to transfer data between a given memory user and the memory banks or another memory user. The high level commands sent by the memory users are built up by memory interfaces MI connected to the memory users, and transmitted through an interconnection network to Packet Memory Command Executors PMCE integrated into each memory bank. The high level commands work with data records identified by Logical Record Addresses (LRA) known by the memory users. During execution of the high level commands by the PMCE, the LRA are translated into physical addresses corresponding to physical address space in the memory banks. The physical address space is created dynamically and released upon need, through the Create or Release Commands.A given memory user is not involved at all by management of physical address space, and works only with the LRA of a record.
摘要:
An arbitration device for enabling a common resource to be shared by a plurality of processors, all connected by a common bus and each processor having a certain access priority. When more than one processor requests access to the resource, the highest priority processor request signal is latched and access is granted while the other requesting processor's latches remain set (access not granted). If two processors request access while the resource is busy, then only the latch of the processor having the highest priority of the two will be reset when the bus becomes available, and that processor will gain access.
摘要:
A packet scheduling system for use in a switching node of a high speed packet switching network. Incoming packets are enqueued in connection queues. Each connection is classified as red (exceeding traffic profile) or green (within traffic profile). QOS priority is also identified for each connection. Packets are dequeued for transmission as a function of priority class and connection class. Higher priority class connections have priority over lower priority class connections. Within a given priority class of connections, green connections have priority over red connections. Round robin scheduling is used for packets from connections in the same priority and connection class. In addition, a dynamic priority coupling mechanism is provided to prevent red higher priority traffic from blocking green lower priority traffic.
摘要:
Apparatus for recovering lost buffer contents in a data processing system uses a memory divided into a plurality of buffers provided with buffer control blocks, through which source and destination users exchange information. A buffer management circuit is responsive to requests from users for allocating buffers to source users in order that source users may store the information to be sent to the destination users. This circuit builds buffer queues and dequeues buffers from the queues to send the information contained therein to the destination users and releases the buffers afterwards. A time mark register is settable to n different values in a predetermined order. The value of the time mark register is changed at the expiration of a time period P. Each time a buffer is allocated to one user, the current value of the time mark register is written into a time mark field of the buffer control block and a state field is set to a first value (leased). When the buffer is released, the state field is set to a second value (released). The contents of the buffer control blocks are read at regular time intervals t after period P, and the state field of every buffer control block is tested to determine whether it is set to the second value. If not so set, the time mark field is compared with the value the time mark register had at the time t-xP, where x is a number such as 1
摘要:
A method and an apparatus for searching a bit field whose significant bits comprise two contiguous bit fields such as the VPI/VCI bit fields of an ATM cell header. The invention uses a hash key based on CRC-n calculated on the bit field to be searched. One m bit field part of the significant bits of the bit field to be searched can be concatenated with the CRC-n to form a double hash key. It appears that, L being the total of the two contiguous bit field lengths, if L=m=n+p, p being greater or equal to 4, the scattering of data to be searched is perfect. The method comprised a first step of pointing to a first address with the hash (or double hash) key and reading a maximum of 2.sup.p addresses before reaching the addresses containing the bit field to be searched.
摘要翻译:一种用于搜索其有效位包括诸如ATM信元头部的VPI / VCI位字段的两个连续位字段的位字段的方法和装置。 本发明使用基于要搜索的位字段上计算的CRC-n的散列密钥。 要搜索的位字段的有效位的一个m位字段部分可以与CRC-n连接以形成双散列密钥。 看来,L是两个相邻位域长度的总和,如果L = m = n + p,p大于或等于4,则要搜索的数据的散射是完美的。 该方法包括在到达包含要搜索的位字段的地址之前,使用散列(或双散列)键指向第一地址并读取最多2p地址的第一步骤。
摘要:
An elastic buffer is provided between two busses working with independent clocking. The buffer is implemented by a piece of RAM memory (37) partitioned into sectors (41), each of which contains successive memory addresses. Each sector (41), can be alternatively written and read, so that at a given moment, a sector in write mode and a sector in read mode may coexist. Each sector is controlled by a mark flag (MF), a set flag corresponding to a fully written sector, and a reset flag corresponding to a sector that has been read onto the destination bus. The mark flag of each sector is set, respectively reset, upon the event of a move in pointer, respectively move out pointer, reaching the next adjacent sector. For a given elastic buffer size, the size of the sectors (41) and the number of mark flags are adaptable to the specifications of the data flow between the origin and destination busses.
摘要:
A device for interconnecting source users and destination users includes a common bus to which a memory with a plurality of independent buffers, a memory interface (22) and a central control apparatus (26) are connected. The memory interface (22) receives messages from source users, stores the messages in selected buffers and chains the buffers together. The central control apparatus generates inbound message queues and outbound message queues in response to commands which it receives from the memory interface.
摘要:
An interface and protocol for linking devices (18) with a control unit (10). The interface includes a dedicated request line (30) per device, a dot-ORed acknowledge line (32), at least one clock line (38) transmitting sets of N clock pulses from the control unit to a device during each data exchange, two data line (34, 36) for serial duplex data transmission and a pair of shift registers one being positioned in the control unit and another being positioned in each of the devices. The protocol is such that for either a read or a write operation the control unit issues two request signals in spaced relationship on the request line and the selected device responds with two acknowledge signals is spaced relationship on the acknowledge line with each one of the acknowledge signals falling after the fall of its associated request signal.
摘要:
An error detection apparatus is implemented in a passive device inserted on a synchronous bus, linking two devices. The bus has data lines onto which data are transferred between the two devices under control of tag lines and clock signals which are companion of the transferred data. The apparatus allows errors to be detected, the failing device to be identified and the error signals to be reported in a psuedo-synchronous way on an error bus due to error detection and reporting logic circuits and a pseudo-synchronous timing circuit.