Распределенная память, Спартан 6 Опции

[GAYVER]

блок двухпортовой распределенки с синхронной записью и асинхронным чтением. описан по шаблону из хелпа. по объему - четверть от максимально доступной. на мапе выдает:

CODE

The following instances are the last set of instances that failed to place:
0. B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O (size: 8)
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMC
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMB
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMA
.............................................

These instances could be impacted by the following constraints
(the line IDs below correspond with the instances above):

Clock Region restrictions

0. LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
LUTM B_IN_ADC/B_RAMD_IN_test/Mram_RAM_RE_STR11_RAMD_O
driver: DCM B_PLL/DCM_inst1 @ DCM_X0Y3
CLOCKREGION_X0Y2, CLOCKREGION_X1Y2
...............................................................

для меня тут никакой смысловой нагрузки... куда смотреть, чего делать?