Altera 50G Interlaken MegaCore Function User Manual
Page 77
RX
Register Offset
Bits
Meaning
Action
2
0xB
[1]
Enable 10G PCS mode
Set this bit to the value of 1 to specify the
PCS is in 10G mode.
[3:2] Verifier counter threshold
Set this field to the value your design
requires to ensure adequate lead time before
the PRBS checker begins counting PRBS
errors. The field value specifies the wait
time in number of
clk_rx_common
clock
cycles. A counter begins counting
clk_rx_
common
clock cycles after the soft reset, and
triggers the start of PRBS checking when the
specified threshold is reached. This field has
the following valid values:
• 2'b00—Specifies the counter threshold
(the wait time) is 127.
• 2'b01—Specifies the counter threshold is
255.
• 2'b10—Specifies the counter threshold is
511.
• 2'b11—Specifies the counter threshold is
1023.
[5]
Enable PRBS9
Set one of these bits to the value of 1, and
the others to the value of 0, to select the
expected polynomial.
[6]
Enable PRBS15
[7]
Enable PRBS23
3
0xC
[0]
Enable PRBS31
[1]
Confirm 10G PCS mode
Set this bit to the value of 1 to confirm the
PCS is in 10G mode.
[3]
PRBS width select
Set this bit to the value of 0 to specify that
the PRBS width is 64 bits.
4
0x13F
[3:0] RX Deserializer width select Set this field to the value of 4'b1110 to
specify that the data width after deserializa‐
tion is 64 bits.
After you enable the IP core to generate or receive PRBS output, by setting the relevant register field
values for each Interlaken lane, you must perform a soft reset of the transceiver transmitters and receivers.
To perform a soft reset of the transceiver transmitters and receivers, on the 50G Interlaken IP core
management interface, program bit [2] of the 50G Interlaken IP core
RESET
register at offset 0x13 with the
value of 1. On the following
mm_clk
cycle, or later, program the bit 0x13[2] with the value of 0 to clear the
reset. After you reset the transceivers and subsequently clear the reset bit, the IP core immediately begins
transmitting PRBS output on the Interlaken link. You can check the receive PRBS status in the
50G Interlaken IP core PRBS status registers (
RX_PRBS_DONE,
RX_PRBS_ERR,
and
RX_PRBS_COUNT
).
After your testing is complete, you must reset these register bits to their default values and perform the
soft reset to enable normal operation.
8-6
Setting up PRBS Mode in Arria 10 Devices
UG-01140
2015.05.04
Altera Corporation
50G Interlaken IP Core Test Features