
Chapter 7: Interlaken PHY IP Core 7–15
Why Transceiver Dynamic Reconfiguration
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
Why Transceiver Dynamic Reconfiguration
As silicon progresses towards smaller process nodes, circuit performance is affected
more by variations due to process, voltage, and temperature (PVT). These process
variations result in analog voltages that can be offset from required ranges. The
calibration performed by the dynamic reconfiguration interface compensates for
variations due to PVT.
Each channel and each TX PLL have separate dynamic reconfiguration interfaces. The
MegaWizard Plug-In Manager provides informational messages on the connectivity
of these interfaces. Example 7–1 shows the messages for a 4-channel Interlaken PHY
IP Core.
Although you must initially create a separate reconfiguration interface for each
channel and TX PLL in your design, when the Quartus II software compiles your
design, it reduces the number of reconfiguration interfaces by merging
reconfiguration interfaces. The synthesized design typically includes a
reconfiguration interface for at least three channels because three channels share an
Avalon-MM slave interface which connects to the Transceiver Reconfiguration
Controller IP Core. Conversely, you cannot connect the three channels that share an
Avalon-MM interface to different Transceiver Reconfiguration Controller IP cores.
Doing so causes a Fitter error. For more information, refer to“Transceiver
Reconfiguration Controller to PHY IP Connectivity”.
Device Registers
[27] RO
rx_crc32_err
Asserted by the CRC32 checker to indicate a CRC error in
the corresponding RX lane.
From block: CRC32 checker.
0x081 [25] RO
rx_sync_lock
Asserted by the frame synchronizer to indicate that 4 frame
synchronization words have been received so that the RX
lane is synchronized.
From block: Frame synchronizer.
[24] RO
rx_word_lock
Asserted when the first alignment pattern is found. The RX
FIFO generates this synchronous signal.
From block: The RX FIFO generates this synchronous
signal.
Table 7–10. Interlaken PHY Registers (Part 3 of 3)
Word
Addr
Bits R/W Register Name Description
Example 7–1. Informational Messages for the Transceiver Reconfiguration Interface
PHY IP will require 5 reconfiguration interfaces for connection to the external
reconfiguration controller.
Reconfiguration interface offsets 0-3 are connected to the transceiver channels.
Reconfiguration interface offset 4 is connected to the transmit PLL.
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