Intermec 073300-001 ユーザーズマニュアル
Chapter 4 — Theory of Operation
IMAGE
CAPTURE
STATE
MACHINE
ADDR DECODE,
RD/WR CTL
DMA
BUFFER
CTL
REGs
FIFO
SD31..0
SA25..0
SCAN_IRQ
HCR_WR2*
HCR_WR5*
HCR_WR5*
SDBUF_D7..0
SCAN_DREQ
Host CPU
I/F
Scanner
I/F
GPIO
REQ#, GNT#
BUS
ARBITER
DBP
COUNT
LOGIC
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
CK30 FPGA Block Diagram-Count Gathering for 1D Scanners
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):
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).
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.
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).
selection, scanner reset, or tethered scanner auto-detect enable,
depending on the installed scanner (See “Using the Scanner Interface
Signal Set” on page 76).
CK30 Handheld Computer Service Manual
79