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---------------------------------------------
memory bandwith on nano 2g (S5L8701)
---------------------------------------------

test_mem ( 48/48/48 MHz)
alignment       none  16byte  off by 4 bytes
DRAM rd    25.0  27.5  25.0  
DRAM wr    17.7  17.7  17.7
DRAM st    17.3  17.3  17.3
DRAM cp    10.6  10.6  10.5
IRAM rd    49.2  48.4  39.5
IRAM wr    39.0  39.0  39.0
IRAM st    39.0  38.5  38.5
IRAM cp    22.2  21.6  22.2

test_mem (192/96/48 MHz)
DRAM rd    57.1  61.5  57.1
DRAM wr    34.7  34.7  34.7
DRAM st    34.7  34.7  34.7
DRAM cp    21.6  21.6  21.6
IRAM rd    114.2  114.2  96.9
IRAM wr    78.0  78.0  78.0
IRAM st    78.0  78.0  78.0
IRAM cp    47.0  47.0  44.4