VRAM Details

• SAM - Serial Access Memory

  • arranged as 256 x 16 registers
  • connected to 16 serial outputs (SDQ0 - SDQ15)
  • registers read in sequential order

• Entire SAM can be loaded from DRAM array in one memory cycle

• Supports a fill operation in which 8 columns be written with data from a color register

  • high, low bytes can be seperately masked in each column

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