RM0082
DDR memory controller (MPMC)
Doc ID 018672 Rev 1
195/844
out_of_range_type [1:0]
Holds the type of command that caused an out-of-range interrupt
request to the memory devices. This parameter is read-only.
For more information on out-of-range address checking, refer to
placement_en [0]
Enables using the placement logic to fill the command queue.
1‘b0 - Placement logic is disabled. The command queue is a straight
FIFO.
1‘b1 - Placement logic is enabled. The command queue will be filled
according to the placement logic factors.
power_down [0]
When this parameter is set to 1'b1, the Memory Controller will complete
processing of the current burst for the current transaction (if any), issue
a pre-charge all command and then disable the clock enable signal to
the DRAM devices. Any subsequent commands in the command queue
will be suspended until this parameter is set to 1'b0.
1'b0 - Enable full power state.
1'b1 - Disable the clock enable and power down the Memory Controller.
priority_en [0]
Controls priority as a condition when using the placement logic to fill the
command queue.
1'b0 - Disabled
1'b1 - Enabled
pwrup_srefresh_exit [0]
Controls controller to exit power-down mode by executing a self-refresh
instead of the full memory initialization.
1'b0 - Disabled
1'b1 - Enabled
q_fullness [3:0]
Defines quantity of data that will be considered full for the command
queue.
rd2rd_turn [0]
Adds an additional clock between back-to-back READ operations to
different chip selects. The extra clock is required for mobile DDR
devices where:
tac_max > (period/2+tac_min)
Without this additional clock, the first READ may drive DQS out at
tac_max and the second READ may drive DQS out at tac_min,
resulting in a contention on the DQS line.
1'b0 - Disabled
1'b1 - Enabled
reduc [0]
Controls the width of the memory datapath. When enabled, the upper
half of the memory buses (DQ, DQS and DM) are unused and relevant
data only exists in the lower half of the buses. This parameter expands
the Memory Controller for use with memory devices of the configured
width or half of the configured width.
For more information on half datapath mode, refer to
.
1'b0 - Standard operation using full memory bus.
1'b1 - Memory datapath width is half of the maximum size.
Table 153.
Memory controller parameters (continued)
Parameter
Description