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EP1SGX40G 数据表(PDF) 59 Page - Altera Corporation |
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EP1SGX40G 数据表(HTML) 59 Page - Altera Corporation |
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59 / 262 page  Altera Corporation 59 Preliminary Source-Synchronous Signaling with DPA Figure 43. Misaligned Captured Bits The dynamic phase selector and synchronizer align the clock and data based on the power-up of both communicating devices, and the channel to channel skew. However, the dynamic phase selector and synchronizer cannot determine the byte boundary, and the data may need to be byte-aligned. The dynamic phase aligner’s data realignment circuitry shifts data bits to correct bit misalignments. The Stratix GX circuitry contains a data-realignment feature controlled by the logic array. Stratix GX devices perform data realignment on the parallel data after the deserialization block. The data realignment can be performed per channel for more flexibility. The data alignment operation requires a state machine to recognize a specific pattern. The procedure requires the bits to be slipped on the data stream to correctly align the incoming data to the start of the byte boundary. The DPA uses its realignment circuitry and the global clock for data realignment. Either a device pin or the logic array asserts the internal rx_channel_data_align node to activate the DPA data-realignment circuitry. Switching this node from low to high activates the realignment circuitry and the data being transferred to the logic array is shifted by one bit. The data realignment block cannot be bypassed. However, if the rx_channel_data_align is not turned on (through the altvlds MegaWizard Plug-In Manager), or when it is not toggled, it will only act as a register latency. A state machine and additional logic can monitor the incoming parallel data and compare it against a known pattern. If the incoming data pattern does not match the known pattern, designers can activate the rx_channel_data_align node again. Repeat this process until the realigner detects the desired match between the known data pattern and incoming parallel data pattern. 0 1 2 3 4 5 6 7 3 4 5 6 7 0 1 2 Correct Alignment Incorrect Alignment |
类似零件编号 - EP1SGX40G |
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类似说明 - EP1SGX40G |
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