Ports and parameters – Altera Phase-Locked Loop Reconfiguration IP Core User Manual
Page 40
Page 40
Specifications
Phase-Locked Loop Reconfiguration (ALTPLL_RECONFIG) Megafunction
February 2012
Altera Corporation
Ports and Parameters
This section describes the ports and parameters of the ALTPLL_RECONFIG
megafunction.
lists the ALTPLL_RECONFIG megafunction input ports.
Table 8. ALTPLL_RECONFIG Megafunction Input Ports (Part 1 of 3)
Port Name
Required?
Description
clock
Yes
Clock input for loading individual parameters. This signal also clocks the PLL during
reconfiguration.
The clock input port must be connected to a valid clock.
Refer to the DC and Switching Characteristics chapter of the respective device
handbooks for the clock f
MAX
.
reset
Yes
Asynchronous reset input to the megafunction.
Altera recommends that you reset this megafunction before first use to guarantee that
it is in a valid state. However, it does power up in the reset state. This port must be
connected.
data_in[]
No
Data input that provides parameter value when writing parameters.
A 9-bit input port that provides the data to be written to the scan cache during a write
operation. The bit width of the counter parameter to be written determines the
number of bits of
data_in[]
that are read into the cache. For example, the low bit
count of the
C0
counter is 8-bit wide, so
data_in[7..0]
is read to the correct cache
location. The bypass mode for the C0 counter is 1-bit wide, so
data_in[0]
is read
for the value of this parameter. If omitted, the default value is
0
.
counter_type[]
No
Specifies the counter type.
An input port in the form of a 4-bit bus that selects which counter type should be
selected for the corresponding operation (
read
,
write
, or
reconfig
). The following
table specifies the mapping between the
counter_type
value and the physical
counter to be set. For details, refer to the following tables:
■
counter_type[3..0]
settings for Stratix III, Stratix IV, and
Cyclone III devices.
■
counter_type[3..0]
settings for Stratix II, Stratix II GX,
Arria GX and HardCopy II devices.
■
counter_type[3..0]
settings for Stratix and Stratix GX
devices.
counter_param[]
No
Specifies the parameter for the value specified in the
counter_type
port.
An input port in the form of a 3-bit bus that selects which parameter for the given
counter type should be updated. The mapping to each parameter type and the
corresponding parameter bit-width are defined in the following tables:
■
counter_param[2..0]
settings for Stratix III, Stratix IV, and
Cyclone III devices.
■
counter_param[2..0]
settings for Stratix II, Stratix II GX,
Arria GX and HardCopy II devices.
■
counter_param[2..0]
settings for Stratix and Stratix GX
devices.