User guide

16–20 Chapter 16: Transceiver Reconfiguration Controller IP Core
Setting the First Tap Value Using DFE in Manual Mode
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Setting the First Tap Value Using DFE in Manual Mode
Complete the following steps to use DFE in Manual mode and set first DFE tap value
to 5:
1. Read the DFE
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 DFE
logical
channel
number register.
3. Write the
DFE_offset address of 0x0 (DFE control register).
4. Write the data value 2'b10 to the
data register to enable DFE power.
5. Write the
control and status register write bit to 1'b1.
6. Read the DFE
control and status register busy bit (bit 8) until it is clear.
7. Write the
DFE_offset address of 0x1 (DFE Tap 1 register).
8. Write the
data value 3'b101 to the data register.
9. Write the
control and status register write bit to 1'b1.
10. Read the
control and status register busy bit. Continue to read the busy bit while
its value is 1‘b1.
11. When
busy equals 1b’0, the Transceiver Reconfiguration Controller has updated
the logical channel.
Example 16–3 shows a reconfiguration that uses DFE in Manual mode and sets first
tap value.
Example 16–3. Register-Based Write To Use DFE in Manual Mode and Set the First DFE Tap Value
to 5 for Logical Channel 0
#Setting logical channel 0
write_32 0x18 0x0
#Setting DFE offset to 0x0
write_32 0x1B 0x0
#Setting data register to 2
write_32 0x1C 0x2
#Writing the data to use DFE in Manual mode
write_32 0x1A 0x1
#Setting DFE offset to 0x1
write_32 0x1B 0x1
#Setting data register to 5
write_32 0x1C 0x5
#Writing the data to set DFE 1st tap value to 5
write_32 0x1A 0x1