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LF4430 Datasheet(PDF) 16 Page - LUXPIA |
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LF4430 Datasheet(HTML) 16 Page - LUXPIA |
16 / 32 page LOGIC Devices Incorporated www.logicdevices.com January 23, 2008 LDS-44xx-A High Performance Memory Product 16 MEMORY FRAME Video Memory / FIFO LF4460 LF4430 LF4415 PRELIMINARY RESET RCLK REN RCLR RSET RDWRB ADDR PrevAdd IntAdd Description Master reset - write/read pointers are clearedMaster reset REN pipelined by 1 RCLK cycle Increment read pointer - read from addr 1 Halt read pointer - no output register update- no read operation Increment read pointer - read from addr 2 Override read pointer to Ext. Addr. Port - read from addr. An Override read pointer to Ext. Addr. Port - read from addr. Am Increment read pointer - read from addr Am+1 Clear read pointer - read from addr 0 Increment read pointer - read from addr 1 0 1 1 1 1 1 1 1 1 1 X 1 1 1 1 0 0 1 1 1 X X X X X 1 1 X X X X X X X X An Am X X X X 0 1 0 0 0 0 0 0 -- X 1 1 1 1 1 1 1 0 1 Figure 8 - Read Address Pointer Control X 0000 0000 0001 0001 0002 An Am Am+1 0000 0000 0000 0001 0001 0002 An Am Am+1 0000 1 Address Control 1. Overriding the Read address is only possible in Single-Channel modes. Holding RSET LOW for multiple cycles allows multi-cycle or ‘full-time’ Read address override - with the address capable of changing every cycle 2. An additional 8 rising RCLK edges are required for the Memory contents to appear on Qx[11:0] [1] NOTES: [2] |
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