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Ixiasoft
Visible to Intel only — GUID: sam1403479858841
Ixiasoft
7.5.1. Features of the Hard Memory Controller
Feature |
Description |
---|---|
Memory Interface Data Width |
|
Memory Density |
The controller supports up to four gigabits density parts and two chip selects. |
Memory Burst Length |
|
Command and Data Reordering |
The controller increases efficiency through the support for out-of-order execution of DRAM commands—with address collision detection-and in-order return of results. |
Starvation Control |
A starvation counter ensures that all requests are served after a predefined time-out period. This function ensures that data with low priority access are not left behind when reordering data for efficiency. |
User-Configurable Priority Support |
When the controller detects a high priority request, it allows the request to bypass the current queuing request. This request is processed immediately and thus reduces latency. |
Avalon®-MM Data Slave Local Interface |
By default, the controller supports the Avalon Memory-Mapped protocol. |
Bank Management |
By default, the controller provides closed-page bank management on every access. The controller intelligently keeps a row open based on incoming traffic. This feature improves the efficiency of the controller especially for random traffic. |
Streaming Reads and Writes |
The controller can issue reads or writes continuously to sequential addresses every clock cycle if the bank is open. This function allows for very high efficiencies with large amounts of data. |
Bank Interleaving |
The controller can issue reads or writes continuously to 'random' addresses. |
Predictive Bank Management |
The controller can issue bank management commands early so that the correct row is open when the read or write occurs. This increases efficiency. |
Multiport Interface |
The interface allows you to connect up to six data masters to access the memory controller through the local interface. You can update the multiport scheduling configuration without interrupting traffic on a port. |
Built-in Burst Adaptor |
The controller can accept bursts of arbitrary sizes on its local interface and map these bursts to efficient memory commands. |
Run-time Configuration of the Controller |
This feature provides support for updates to the timing parameters without requiring reconfiguration of the FPGA, apart from the standard compile-time setting of the timing parameters. |
On-Die Termination |
The controller controls the on-die termination (ODT) in the memory, which improves signal integrity and simplifies your board design. |
User-Controlled Refresh Timing |
You can optionally control when refreshes occur—allowing the refreshes to avoid clashing of important reads or writes with the refresh lock-out time. |
Low Power Modes |
You can optionally request the controller to put the memory into the self-refresh or deep power-down modes. |
Partial Array Self-Refresh |
You can select the region of memory to refresh during self-refresh through the mode register to save power. |
ECC |
Standard Hamming single error correction, double error detection (SECDED) error correction code (ECC) support:
|
Additive Latency |
With additive latency, the controller can issue a READ/WRITE command after the ACTIVATE command to the bank prior to t RCD to increase the command efficiency.
CAUTION:
Efficiency degradation may occur when using the additive latency feature with the hard memory controller for DDR3 SDRAM interfaces at 533 MHz.
|
Write Acknowledgment |
The controller supports write acknowledgment on the local interface. |
User Control of Memory Controller Initialization |
The controller supports initialization of the memory controller under the control of user logic—for example, through the software control in the user system if a processor is present. |
Controller Bonding Support |
You can bond two controllers to achieve wider data width for higher bandwidth applications. |