Altera UG-01080 Guía de usuario Pagina 402

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 484
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 401
16–24 Chapter 16: Transceiver Reconfiguration Controller IP Core
PLL Reconfiguration
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
You can establish the number of possible PLL configurations on the Reconfiguration
tab of the appropriate transceiver PHY IP core. The Reconfiguration tab allows you to
specify up to five input reference clocks and up to four TX PLLs. You can also change
the input clock source to the CDR PLL; up to five input clock sources are possible. If
you plan to dynamically reconfigure the PLLs in your design, you must also enable
Allow PLL Reconfiguration and specify the Main TX PLL logical index which is the
PLL that the Quartus II software instantiates at power up. Figure 16–4 illustrates these
parameters.
1 If you dynamically reconfigure PLLs, you must provide your own reset logic by
including the Altera Reset Controller IP Core or your own custom reset logic in your
design. For more information about the Altera-provided reset controller, refer to
Chapter 17, Transceiver PHY Reset Controller IP Core.
f For more information about the Stratix V reset sequence, refer to Transceiver Reset
Control in Stratix V Devices in volume 2 of the Stratix V Device Handbook. For Arria V
devices, refer to Transceiver Reset Control and Power-Down in Arria V Devices. For
Cyclone V devices refer to Transceiver Reset Control and Power Down in Cyclone V
Devices.
When you specify multiple PLLs, you must use the QSF assignment,
XCVR_TX_PLL_RECONFIG_GROUP
, to identify the PLLs within a reconfiguration group
using the Assignment Editor. The
XCVR_TX_PLL_RECONFIG_GROUP
assignment identifies
PLLs that the Quartus II Fitter can merge. You can assign TX PLLs from different
transceiver PHY IP core instances to the same group.
1 You must create the
XCVR_TX_PLL_RECONFIG_GROUP
even if one transceiver PHY IP
core instance instantiates multiple TX PLLs.
Figure 16–4. Reconfiguration Tab of Custom, Low Latency, and Deterministic Latency
Transceiver PHYs
Vista de pagina 401
1 2 ... 397 398 399 400 401 402 403 404 405 406 407 ... 483 484

Comentarios a estos manuales

Sin comentarios