Why does Striatix 10 -3 speed 's Fmax of ROM restricted on 420Mhz, But it is not described in Timequest report?

Hi, expert As Table 65. Memory Block Performance Specifications for Intel Stratix 10 Devices​ in Stratix 10 datasheet, the 'True dual port, all supported widths ' -E3V, performance is 420Mhz. Bu...