
9–6 Chapter 9: Custom PHY IP Core
General Options Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
The CDR can be put in either manual or automatic mode. The CDR mode is controlled
with the
pma_rx_set_locktodata
and
pma_rx_set_locktoref
registers. Table 9–3
shows the required settings to control the CDR mode.
Enable Avalon data interfaces
and bit reversal
On/Off
When you turn this option On, the order of symbols is changed.
This option is typically required if you are planning to import your
Custom PHY IP Core into a Qsys system.
Enable embedded reset control On/Off
When On, the automatic reset controller initiates the reset
sequence for the transceiver. When Off you can design your own
reset logic using
tx_analogreset
,
rx_analogreset
,
tx_digitalreset
,
rx_digitalreset
, and
pll_powerdown
which are top-level ports of the Custom Transceiver PHY. You may
also use the Transceiver PHY Reset Controller' to reset the
transceivers. For more information, refer to the Transceiver
Reconfiguration Controller IP Core.
By default, the CDR circuitry is in automatic lock mode whether you
use the embedded reset controller or design your own reset logic.
You can switch the CDR to manual mode by writing the
pma_rx_setlocktodata
or
pma_rx_set_locktoref
registers
to 1. If either the
pma_rx_set_locktodata
and
pma_rx_set_locktoref
is set, the CDR automatic lock mode is
disabled as Table 9–3 illustrates. For more information about the
reset control and status registers, refer to Custom PHY IP Core
Registers.
For more information about reset in Stratix V devices, refer to
Transceiver Reset Control in Stratix V Devices in volume 2 of the
Stratix V Device Handbook.
Table 9–2. Custom PHY General Options (Part 4 of 4)
Name Value Description
Table 9–3. Reset Mode
rx_set_locktoref rx_set_locktodata CDR Lock Mode
1 0 Manual RX CDR locked to reference
X 1 Manual RX CDR locked to data
0 0 Automatic RX CDR
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