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Line 105... |
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Validation note: modes 1 and 2 have not been verified to date.
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Validation note: modes 1 and 2 have not been verified to date.
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4.0 Utility
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4.0 Utility
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This section is currently empty, but is intended for blocks which do not fit
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This is intended for blocks which do not fit into one of the above categories.
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into one of the above categories. Utility blocks could be items like a switch
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Utility blocks could be items like a switch fabric, packet ring, or a scoreboard.
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fabric, packet ring, or a scoreboard.
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4.1 sd_ring_node
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This is a building block for a unidirectional ring. Data is placed on the ring
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using the consumer interface and is removed on the producer interface. sd_ring_node
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supports only point-to-point single-transaction processing (single transaction meaning
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that subsequent requests from the same source are treated as independent, and other
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requests from other nodes may be interleaved at the destination).
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4.2 sd_scoreboard
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This implements a "scoreboard", or centralized repository of information about a number
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of items. The scoreboard has a single consumer and producer interface. The user
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is expected to use a pipeline join block (such as sd_rrslow) to serialize requests.
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The scoreboard has a transaction id that it carries with each read request that can be
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used to steer the results back to the requestor. For example, the "p_grant" output from
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rrslow can be connected to the c_txid input, and the p_txid output can be connected to
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the c_dst_vld input of sd_mirror, giving multi-read/multi-write capability.
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The scoreboard supports both read and write, where write can also use a mask to implement
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partial updates. If the mask is set to anything other than all 1's, the scoreboard performs
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a read-modify-write to change only the unmasked portion of the data.
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5.0 Memory
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5.0 Memory
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Contains synthesizable memories implemented as flops. These correspond to the
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Contains synthesizable memories implemented as flops. These correspond to the
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commonly used registered-output memories available in most technologies.
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commonly used registered-output memories available in most technologies.
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