Intermec 073296-001 Manual Do Utilizador

IMAGE

CAPTURE

STATE

MACHINE

ADDR DECODE,

RD/WR CTL

DMA

BUFFER

CTL

REGs

FIFO

SD31..0

SA25..0

SCAN_IRQ

HCR_WR2*
HCR_WR5*

SDBUF_D7..0

SCAN_DREQ

Host CPU

I/F

Scanner

I/F

GPIO

REQ#, GNT#

BUS

ARBITER

DBP

COUNT
LOGIC

DQM3..0

nOE

nPWE

RDY

RD/WR

FPGA_CS

DBP_HSYNC

SOS_VSYNC

ILLUM_LASEN_RTS

SCAN_LED

SCAN_LED_LOW

TETH_DBP, SOS

TETH_PRESENT

GPIO

USER_LED<2:1>

SCAN_TRIG*

PCI

CTL

REGs

IRQ

CTL

Kypd

KEY_RET<7:0>

Scanner I/F

nWE

SPEED_RANGE_GDRD

SCAN_FLASH_EN

DOCK_TRIG*

VOL<2:0>

IMAGER_PIXCLK

BATT_FAULT_IRQ

IO MUX LOGIC

BLUR 

DETECT,

EXPOSURE

SENSE

PCI/HCR_CS

Bus I/F

 

The scanner is enabled and controlled from the PXA255 through memory-
mapped registers in the FPGA and octal register U11 (see the “Using the 
Scanner Interface Signal Set” table on page 76): 

•  SCAN_PWR_EN* is asserted low to switch 3.3V and 5V power 

through high-side switches U12 and U13 to scanner connector J3.  The 
scan flex is used to select the voltage appropriate to the installed scanner.  
The selected voltage is also routed through a loop-back on the flex to 
provide the appropriate pull-up voltage (SCAN_VCC) for signals from 
open-collector scanner outputs (like SCAN_TRIG*, DBP_HSYNC, 
and SOS_VSYNC). 

Most scanners are powered up only when scanning is commanded, but 
tethered scanners are powered continuously while the CK30 is on so that 
their triggers will work. 

•  SCAN_FLASH_EN* is asserted low to enable the scanner and/or start 

its dither mirror. 

•  ILLUM_LASEN_RTS is asserted low to enable the laser or scanner 

illumination. 

•  SCAN_TRIG* is set high or low depending on the scanner.  This is a 

general-purpose control line used for spotter beam control, scan speed 
selection, scanner reset, or tethered scanner auto-detect enable, 
depending on the installed scanner (See “Using the Scanner Interface 
Signal Set” on page 76).