GL842 datasheet(33/64 Pages) GENESYS

33 / 64 page

GL842 USB 2.0 2-in-1 Scanner Controller

Page 33

Offset 37h …….……..……………………..………..….………..….…..…….…. Default value = 8’h00

MAXWD7 MAXWD6 MAXWD5 MAXWD4 MAXWD3 MAXWD2 MAXWD1 MAXWD0

R/W

7-0 MAXWD[7:0] To set maximum word size per line for ASIC estimation.

If usable buffer size < MAXWD,then buffer is full.The scanner execute forward

And Backward moving.

Offset 38h ……..……..……………………..………..….………..….……..……. Default value = 8’h15

LPERIOD15 LPERIOD14 LPERIOD13 LPERIOD12 LPERIOD11 LPERIOD10

LPERIOD9 LPERIOD8

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7-0 LPERIOD[15:8] To set Line period(or exposure time) for CCD.

Unit : pixel count

Note: Can’t be programmed to logic zero.

Offset 39h ……..…..……………………..………..….………..………………. Default value = 8’h18

LPERIOD7 LPERIOD6 LPERIOD5 LPERIOD4 LPERIOD3 LPERIOD2 LPERIOD1 LPERIOD0

R/W

7-0 LPERIOD[7:0] To set Line period(or exposure time) for CCD.

Unit : pixel count

Note: Can’t be programmed to logic zero.

Offset 3Ah ……..……..……………………………..….………..….…..…….…. Default value = 8’h00

FEWRDATA8

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7-1 RESERVED

0 FEWRDATA8 This port is used to write data to control register of front-end.

Offset 3Bh ……..……..…………………..………..….………..….…..…….…. Default value = 8’h00

FEWRDATA7 FEWRDATA6 FEWRDATA5 FEWRDATA4 FEWRDATA3 FEWRDATA2 FEWRDATA1 FEWRDATA0

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7-0 FEWRDATA[7:0] This port is used to write data to control register of front-end.

Offset 3Ch …….……………………………………..…………..….…..…….…. Default value = 8’h00

RAMWRDATA

R/W

RAMWRDATA

This port is used to write data to DRAM.

GL842 Datasheet(PDF) 33 Page - GENESYS LOGIC