Altera JESD204B IP - Manual (Page 110)

Signal Clock Domain Direction Description
csr_l[4:0]
(35)
mgmt_clk Input
Indicates the number of active lanes for the link.
This 5-bit bus represents the L value in zero-
based binary format. For example, if L = 1, the
csr_l[4:0]
= "00000". This design example
supports the following values:
• 00000
• 00001
• 00011
• 00111
Any programmed value beyond the supported
range may result in undeterminable behavior in
the transport layer. You must ensure that the
csr_l[4:0]
value always match the system
parameter L value.
Runtime reconfiguration supports L fallback. For
static configuration, set the maximum L and
reconfigure csr_l[] to a smaller value during
runtime. This transport layer only supports
higher index channels to be powered down. To
interleave the de-commision channels, you need
to modify the interface connection from the DLL
to transport layer.
Connect this signal to the RX DLL
csr_l[]
output pin.
(35) This signal should be static and valid before the deassertion of the
link_rst_n
and
frame_rst_n
signals.
UG-01142
2015.05.04
RX Path 5-29
JESD204B IP Core Design Guidelines Altera Corporation
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