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GL842 Datasheet(PDF) 21 Page - GENESYS LOGIC |
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GL842 Datasheet(HTML) 21 Page - GENESYS LOGIC |
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21 / 64 page  GL842 USB 2.0 2-in-1 Scanner Controller Genesys Logic Inc.—All rights reserved. Page 21 Offset 07h ……………………………………………..…………..……..………. Default value = 8’h00 X X X X SRAMSEL FASTDMA DMASEL DMARDWR X X X X R/W R/W R/W R/W 7-4 RESERVED - 3 SRAMSEL 0 DMA access for DRAM. 1 DMA access for SRAM. 2 FASTDMA 0 4clocks/access,that is to say 4clocks/16bits or 4clocks/8bits for DMA access. 1 2clocks/access,that is to say 2clocks/16bits or 2clocks/8bits for DMA access. 1 DMASEL 0 MPU access DRAM under command mode. 1 DMA access DRAM under command mode. 0 DMARDWR 0 DMA write DRAM under command mode. 1 DMA read DRAM under command mode. Note: DMA operation can be processed under CPU and DMA type. Offset 08h ……………………………………………..…………..……..………. Default value = 8’h00 X DECFLAG GMMFFR GMMFFG GMMFFB GMMZR GMMZG GMMZB X R/W R/W R/W R/W R/W R/W R/W 7 RESERVED - 6 DECFLAG 0 Gamma table is increment type 1 Gamma table is decrement type. 5 GMMFFR To indicate that red channel Gamma table address FFH is special value. 4 GMMFFG To indicate that red channel Gamma table address FFH is special value. 3 GMMFFB To indicate that red channel Gamma table address FFH is special value. 2 GMMZR To indicate that red channel Gamma table address 00H is special value. 1 GMMZG To indicate that green channel Gamma table address 00H is special value. 0 GMMZB To indicate that blue channel Gamma table address 00H is special value. Offset 09h ……………………………………………..…………..……..………. Default value = 8’h00 MCNTSET1 MCNTSET0 CLKSET1 CLKSET0 BACKSCAN ENHANCE SHORTTG NWAIT R/W R/W R/W R/W R/W R/W R/W R/W 7-6 MCNTSET[1:0] To select the unit of motor table counter. 00 Pixel count. 01 System clock*2. 10 System clock*3. 11 System clock*4. 5-4 CLKSET[1:0] To select the system clock frequency. 00 24 MHz 01 30 MHz 10 40 MHz 11 48 MHz 3 BACKSCAN 0 To select forward scan function. 1 To enable backward scan function. 2 ENHANCE 0 To select normal EPP interface speed for USB2.0 1 To enhance EPP interface speed for USB2.0 1 SHORTTG Enable short CCD SH(TG) period for film scanning. 0 NWAIT To delay nWait (H_BUSY) one clock. |
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