Altera Transceiver PHY IP Core Manual de usuario Pagina 442

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Table 14-24: 10G TX FIFO Parameters
Parameter Range Description
TX FIFO Mode
Interlaken
phase_comp
register
Specifies one of the following 3 modes:
interlaken : The TX FIFO acts as an
elastic buffer. The FIFO write clock
frequency (coreclk) can exceed that
of the effective read clock, tx_
clkout. You can control writes to
the FIFO with tx_data_valid. By
monitoring the FIFO flags, you can
avoid the FIFO full and empty
conditions. The Interlaken frame
generator controls reads.
phase_comp : The TX FIFO
compensates for the clock phase
difference between the coreclkin
and tx_clkout which is an internal
PCS clock.
register : The TX FIFO is bypassed.
tx_data and tx_data_valid are
registered at the FIFO output. You
must control tx_data_valid
precisely based on gearbox ratio to
avoid gearbox underflow or overflow
conditions.
TX FIFO full threshold
0-31 Specifies the full threshold for the 10G
PCS TX FIFO. The active high TX FIFO
full flag is synchronous to coreclk. The
default value is 31.
TX FIFO empty threshold 0-31 Specifies the empty threshold for the
10G PCS TX FIFO. The active high TX
FIFO empty flag is synchronous to
coreclk. The default value is 0.
TX FIFO partially full threshold 0-31 Specifies the partially full threshold for
the 10G PCS TX FIFO. The active high
TX FIFO partially full flag is synchro‐
nous to coreclk. The default value is 23.
TX FIFO partially empty threshold 0-31 Specifies the partially empty threshold
for the 10G PCS TX FIFO. The active
high TX FIFO partially empty flag is
synchronous to coreclk.
Enable tx_10g_fifo_full port On/Off When you turn this option On , the 10G
PCS includes the active high tx_10g_
fifo_full port. tx_10g_fifo_full is
synchronous to coreclk.
UG-01080
2015.01.19
10G PCS Parameters for Arria V GZ Native PHY
14-31
Arria V GZ Transceiver Native PHY IP Core
Altera Corporation
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