User guide

Address Bit Values
0x13C[7] 1’b0
0x132[5:4] 2’b00
0x142[4] 1’b0
0x11D[0] 1’b0
IP Guided Reconfiguration Flow
Use the IP guided reconfiguration flow to perform dynamic reconfiguration when you need to change
multiple parameters or parameters in multiple addresses for the transceiver channel or PLL. You can use
this flow to change data rates, change clock divider values, or switch from one PCS datapath to another.
You must generate the required configuration files for the base and modified Transceiver Native PHY or
PLL IP configurations.
The configuration files contain addresses and bit values of the corresponding configuration. Compare the
differences between the base and modified configuration files. The differences between these files indicate
the addresses and bit values that must change to switch from one configuration to another. Perform read-
modify-writes for the bit values that are different from the base configuration to obtain the modified
configuration.
To perform dynamic reconfiguration using the IP Guided Reconfiguration Flow:
1. Write 0x2 to address 0x0 of the channel.
2. Perform a read-modify-write to all addresses and bit values that are different from the base configura‐
tion.
3. Write 0x3 to address 0x0 of the channel.
The bit values that must be changed to obtain the new configuration may span across multiple addresses,
such as when switching between Standard, Enhanced, and PCS Direct data paths. It is difficult to
manually compare these values for the base and modified configurations and then build logic to stream
the different values in the modified configuration. You can use the multiple profiles feature of Native PHY
IP to store the parameter settings (MIF configuration file) to memory. With the configuration content
saved, you can read from the memory and write the content to the target channel for reconfiguration.
Optionally, you can also use the embedded reconfiguration streamer feature of Native PHY IP, which
includes the logic to store the individual profile information and logic to perform streaming. Using the
embedded reconfiguration streamer, you can reduce the number of read-modify-write operations to
obtain the modified configuration.
To perform dynamic reconfiguration using the Embedded Reconfiguration Streamer:
1. Write 0x2 to address 0x0 of the channel.
2. Perform a read-modify-write to address x340 with the desired profile select, broadcast bit, and
configuration load bit set accordingly. For example, to stream profile 1 to a channel, perform a read-
modify-write to bits x340[2:0] with 3’b001, bit x340[6] with 1’b0 to disable broadcasting, and bit
x340[7] with 1’b1 to initiate streaming.
3. Poll the streamer busy bit at address x341 (x341[0]) at regular intervals. When the busy bit is 1’b0, the
reconfiguration is complete.
4. Write 0x3 to address 0x0 of the channel.
6-18
IP Guided Reconfiguration Flow
UG-01143
2015.05.11
Altera Corporation
Reconfiguration Interface and Dynamic Reconfiguration
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