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15–10 Chapter 15: Cyclone V Transceiver Native PHY IP Core
Standard PCS Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
f For more information refer to the Receiver Phase Compensation FIFO and Transmitter
Phase Compensation FIFO sections in Transceiver Architecture in Cyclone V Devices.
Table 15–11. Phase Compensation FIFO Parameters
Parameter Range Description
TX FIFO mode
low_latency
register_fifo
The following 2 modes are possible:
low_latency: This mode adds 3–4 cycles of latency to the TX
datapath.
register_fifo: In this mode the FIFO is replaced by registers to
reduce the latency through the PCS. Use this mode for
protocols that require deterministic latency, such as CPRI.
RX FIFO mode
low_latency
register_fifo
The following 2 modes are possible:
low_latency: This mode adds 2–3 cycles of latency to the TX
datapath.
register_fifo: In this mode the FIFO is replaced by registers to
reduce the latency through the PCS. Use this mode for
protocols that require deterministic latency, such as CPRI.
Enable tx_std_pcfifo_full port On/Off
When you turn this option On, the TX Phase compensation FIFO
outputs a FIFO full status flag.
Enable tx_std_pcfifo_empty port On/Off
When you turn this option On, the TX Phase compensation FIFO
outputs a FIFO empty status flag.
Enable rx_std_pcfifo_full port On/Off
When you turn this option On, the RX Phase compensation FIFO
outputs a FIFO full status flag.
Enable rx_std_pcfifo_empty port On/Off
When you turn this option On, the RX Phase compensation FIFO
outputs a FIFO empty status flag.
Enable rx_std_rmfifo_empty port On/Off
When you turn this option On, the rate match FIFO outputs a FIFO
empty status flag. The rate match FIFO compensates for small
clock frequency differences between the upstream transmitter
and the local receiver clocks by inserting or removing skip (SKP)
symbols or ordered sets from the inter-packet gap (IPG) or idle
stream.
Enable rx_std_rmfifo_full port On/Off
When you turn this option On, the rate match FIFO outputs a FIFO
full status flag.
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