This section describes the configuration parameters that you
can set for the DMC-400.
Note
If the DMC-400 cannot map an ACE-Lite burst to a single DMC-400
burst, it splits the ACE-Lite burst into multiple DMC-400 bursts
that in turn consume multiple slots. Therefore the terms burst and
hazards refer to DMC-400 bursts and DMC-400 hazards, and not ACE-Lite bursts
and ACE-Lite hazards.
System configuration parameters
Table 2.3 shows
the system configuration parameters that you can set.
Table 2.3. System configuration parameters
| Description | Range of values | Default value |
|---|
| The bit-width of the system ID bus | 4-24 | 8 |
| The bit-width of the system interface address
bus | 32, 40, 64 | 32 |
| The bit-width of the system interface data
bus | 64, 128, 256 | 64 |
| The number of read bursts that each system
interface can accept | 16, 32, 64 | 32 |
| The number of read ID hazards that each system
interface can issue before stalling more requests | 8, 16 | 8 |
| How you implement the read hazard buffer | RAM, synthesized registers | synthesized registers |
| Whether to include logic to support Virtual
Networks | False, True | False |
Memory configuration parameters
Table 2.4 shows
the memory configuration parameters that you can set.
Table 2.4. Memory configuration parameters
| Description | Range of values | Default value |
|---|
| The bit-width of the DFI data bus | 32, 64, 128 | 64 |
| The number of chip-selects on each memory interface | 1, 2 | 1 |
| The number of memory bursts the write buffer
can hold | 16, 32, 64 | 32 |
| How you implement the write buffer | RAM, synthesized registers | synthesized registers |
| The number of memory bursts the read queue
can hold | 16, 32, 64 | 32 |
| The number of DFI data beats in each queued
burst | 4, 8 | 8 |
| Whether to include logic to support Single
Error Correct, Double Error Detect ECC protection on the external
memory. ECC is only supported for DFI widths of 128 bits or 64 bits | False, True | False |
File selection configurable parameters
You must select the following configurable parameters by choosing
the correct Verilog file:
number of system interfaces, the permitted values are 1, 2,
or 4
number of memory channels, the permitted values
are 1 or 2.
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