User guide
16–36 Chapter 16: Transceiver Reconfiguration Controller IP Core
Changing Transceiver Settings Using Register-Based Reconfiguration
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
You can create a reduced MIF from the following two MIFs:
■ Original MIF—contains the transceiver settings that were specified during the
initial compilation
■ Reconfigured MIF—contains the new transceiver settings. You generate the
reconfigured MIF by modifying the original transceiver settings. For example, if
the original compilation specifies a clock divider value of 1 and the reconfigured
compilation specifies a clock divider value of 2, the MIF files reflect that change.
The reduced MIF contains only the changed content. In this example, the
difference between the two MIFs would be the clock divider value.
Follow these steps to generate a reduced MIF:
1. Determine the content differences between the original MIF and the reconfigured
MIF. For this example, assume there are bit differences at offset 5 and offset 20.
These offsets reside in the
PMA-TX
and
PMA-RX
sections of the MIF.
2. Use a text editor to create a new reduced MIF file. In this example, we will call the
reduced MIF reduced_mif.mif. Copy the
WIDTH
,
DEPTH
,
ADDRESS_RADIX
,
DATA_RADIX
and
CONTENT BEGIN
lines from the original MIF to reduced_mif.mif.
3. Copy offsets 0-3 as described Table 16–26 from the original MIF to
reduced_mif.mif. The reconfiguration MIF must always include these lines.
4. Copy all offsets of the
PMA-TX
and
PMA-RX
sections from the reconfigured MIF to
reduced_mif.mif.
5. Copy the
End of MIF
opcode offset and
END;
from the original MIF to
reduced_mif.mif.
6. Renumber reduced_mif.mif sequentially and update the
DEPTH
variable with the
new value. The new value equals the number offsets in reduced_mif.mif.
You can now use reduced_mif.mif to reconfigure the transceiver.
Changing Transceiver Settings Using Register-Based Reconfiguration
In register-based mode, you use a sequence of Avalon-MM writes and reads to update
individual transceiver settings. The following section describes how to perform a
register-based reconfiguration read and write.
Register-Based Write
Complete the following steps to perform a register-based write:
1. Read the
control and status
register
busy
bit (bit 8) until it is clear.
2. Write the logical channel number of the channel to be updated to the
logical
channel
number
register.
3. Write the <feature> offset address.
4. Write the appropriate data value to the
data
register.
5. Write the
control
and
status
register
write
bit to 1’b1.
6. Read the
control
and
status
register
busy
bit. Continue to read the busy bit while
its value is one.