RM0082
DDR memory controller (MPMC)
Doc ID 018672 Rev 1
185/844
10.14
Summary of memory controller parameters
Note:
The table below gives a description of the parameters referred to throughout this chapter. To
fully understand the concepts related to each parameter, please refer to the relevant
sections of the document.
Table 153.
Memory controller parameters
Parameter
Description
AGING[0]
Enables aging of commands in the command queue when using the
placement logic to fill the command queue.
The total number of cycles required to decrement the priority value on a
command by one is the product of the values in the age_count and
command_age_count parameters.
1'b0 - Disabled
1'b1 - Enabled
addr_cmp_en [0]
Enables address collision/data coherency detection as a condition
when using the placement logic to fill the command queue.
1'b0 - Disabled
1'b1 - Enabled
addr_pins [2:0]
Defines the difference between the maximum number of address pins
configured (15) and the actual number of pins being used. The user
address is automatically shifted so that the user address space is
mapped contiguously into the memory map based on the value of this
parameter. For details, please refer to
.
age_count [5:0]
Holds the initial value of the master aging-rate counter. When using the
placement logic to fill the command queue, the command aging
counters will be decremented one each time the master aging-rate
counter counts down age_count cycles.
ahbX_fifo_type_reg [1:0]
Sets the correlation of the clock domains between AHB port X and the
Memory Controller core clock.
2'b00 - Asynchronous
2'b01 - 2:1 Reserved
2'b10 - 1:2 Port: Core Pseudo-Synchronous
2'b11 - Synchronous
ahbX_port_ordering [2:0]
Used in weighted round-robin arbitration to modify the order than the
ports are scanned when multiple commands are at the same priority
level and have the same relative priorities.
ahbX_priority_relax [9:0]
Holds the counter value for AHB port X at which the priority relax
condition is triggered in weighted round robin arbitration.
ahbX_priorityY_relative_pri
ority [3:0]
Holds the relative priority of AHB port X for priority Y commands in
weighted round robin arbitration.
ahbX_r_priority [2:0]
Sets the priority of READ commands from AHB port X. A value of 0 is
the highest priority.
