Memory Summary
Virtex has two kinds of internal memory
- distributed SelectRAM+ for small RAMs
- Block SelectRAM+ for larger RAMs
SelectRAM+
- 0.6 ns read access time
- 16- and 32-word RAMs / 16-word dual-ported RAMs
- 16-word shift registers
- sequential write/random read FIFOs, pipelining, LUT functions
Dual-ported 4096-bit Block SelectRAM+
- 3.3 ns read access time
- true dual-ported operation
- both ports are read/write / ports can be clocked asynchronously
- configurable aspect ratio
- 4096 x 1 bit to 256 x 16 bits / configure ports differently for width/rate conversion
High-speed SelectI/O access to external RAM