Freeze and unfreeze controls, Data source controller, Standard partial reconfiguration data interface – Altera Partial Reconfiguration IP Core User Manual
Page 18

The controller receives data and sends it to the
prblock
WYSIWYG atom primitive during a PR event
with the clock-to-data ratio (CDRATIO) you specify when you instantiate the Partial Reconfiguration IP
core.
Table 8: CDRATIO for PR Compression and/or Encryption
The following table lists the range of values for the clock-to-data ratio for bitstreams that are compressed,
encrypted, both, or neither.
Compressed
Encrypted
Clock-to-Data Ratio
No
No
x1
No
Yes
x2
Yes
No
x4
Yes
Yes
x4
Related Information
Instantiating the Partial Reconfiguration IP Core in the Quartus II IP Catalog
Freeze and Unfreeze Controls
The Freeze/Unfreeze controller logic of the Partial Reconfiguration IP core provides a signal to the user
specified PR regions, freezing all input signals during PR operation to avoid current contention.
You begin a PR event by asserting the
pr_start
input port to the PR IP core. The Freeze/Unfreeeze
Controller then asserts the output freeze signal high and sends it to the PR region you specified. All the
input signals coming into that PR region are then pulled high, preventing current contention in the
device. The PR IP core does not differentiate between multiple PR regions, so you may need to create
custom freeze logic if you are freezing individual PR regions.
Once the PR operation is completed, this controller asserts the output freeze signal low. All the input
signals coming into the specified PR region are released and the PR region is ready for normal operation.
Related Information
•
Partial Reconfiguration IP Core Timing Specification
•
Partial Reconfiguration IP Core Ports
on page 8
Data Source Controller
This controller handles the source of PR data, either from JTAG or standard data interface.
The JTAG interface takes precedence over the standard PR data interface. For example, whenever JTAG is
engaged through command from Quartus II Programmer tool, the PR data is sourced from the JTAG
interface rather than the PR data interface.
Standard Partial Reconfiguration Data Interface
18
Freeze and Unfreeze Controls
UG-PARTRECON
2015.05.04
Altera Corporation
Partial Reconfiguration IP Core