DDR memory controller (MPMC)
RM0082
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Doc ID 018672 Rev 1
tref [13:0]
Defines the DRAM cycles between refresh commands.
Please refer to
tref_enable [0]
Enables internal refresh commands. If command refresh mode is
configured, then refresh commands will be issued based on the internal
tref counter and any refresh commands sent through the command
interface.
1'b0 - Internal refresh commands disabled.
1'b1 - Internal refresh commands enabled.
trfc [7:0]
Defines the DRAM refresh command time, in cycles.
Please refer to
trp [3:0]
Defines the DRAM pre-charge command time, in cycles.
trrd [2:0]
Defines the DRAM activate to activate delay for different banks, in
cycles.
trtp [2:0]
Defines the DRAM tRTP (READ to pre-charge time) parameter, in
cycles.
twr_int [2:0]
Defines the DRAM WRITE recovery time, in cycles.
twtr [2:0]
Sets the number of cycles needed to switch from a WRITE to a READ
operation, as requested by the DDR SDRAM specification.
txsnr [15:0]
Defines the DRAM tXSNR parameter, in cycles.
txsr [15:0]
Defines the DRAM self-refresh exit time, in cycles.
user_def_reg_0 [31:0]
Bit[31:1] - Reserved
Bit[0] - Controls READ data retime:
1'b0 = Read data retime in circuit
1'b1 = Read data retime is bypassed
For more information on the READ data retime function, please refer to
.
user_def_reg_1 [31:0]
This register is not used in the device and should be considered as
reserved.
version [15:0]
Holds the Memory Controller version number for this controller. This
parameter is read-only For the actual silicon revision (XX,YY) the
controller revision is
0x2041
weighted_round_robin_late
ncy _control [0]
Controls the weighted round-robin latency option.
1'b0 - Counters only count when their port has a command waiting to
be processed.
1'b1 - Counters are always running.
weighted_round_robin_wei
ght _sharing [1:0]
Reports that the port pair is tied together in arbitration decisions during
weighted round-robin arbitration. Bit 0 represents ports 0 and 1, bit 1
represents ports 2 and 3, etc. Bit setting is as follows:
1'b0 - The represented ports are treated independently in arbitration.
1'b1- The represented ports are tied together for arbitration.
Table 153.
Memory controller parameters (continued)
Parameter
Description