802.11B/G Radio; 10/100Mb Ethernet; Scanners - Intermec CK30 Service Manual

Chapter 4 — Theory of Operation

802.11b/g Radio

10/100Mb Ethernet

Scanners

74
802.11b and 802.11g are supported through an Actiontec 802MIG2 Type
3A Mini PCI card based on the Intersil Prism GT chipset. The 802MIG2
is a "flashless" card: it has a small EEPROM for parameters like MAC
address, but there is no flash holding a firmware image. Instead, the
firmware is downloaded to the card from CK30 system flash by the radio
driver at boot time and on resume.
This radio is a bus-mastering device: It does not rely on interrupting the
PXA255 to have it transfer data to and from the card. Instead, when it
needs to transfer data to and from system SDRAM, it initiates its own read
and write transactions on the Mini PCI bus to the (target) PCI bridge in
the FPGA. The PCI bridge in turn requests ownership of the PXA255
system bus to complete the transaction to or from system SDRAM.
At first release, the radio is powered and active only when the computer is
awake and is powered off during Suspend. Primary power management is
handled by the card itself and its driver. The power management mode is
user-selectable through the configuration menus.
10/100 Ethernet is supported through an Actiontec MP100R2 Type 3A
Mini PCI Ethernet card based on the Realtek RTL8100BL controller.
This card is also a bus-mastering device: It does not rely on interrupting
the PXA255 to have it transfer data to and from the card. Instead, when it
needs to transfer data to and from system SDRAM, it initiates its own read
and write transactions on the Mini PCI bus to the (target) PCI bridge in
the FPGA. The PCI bridge in turn requests ownership of the PXA255
system bus to complete the transaction to or from system SDRAM.
The 802.3 sideband signals in the Mini PCI connector are not used.
Instead, a short cable assembly is used to bring the 802.3 signals from a
connector on the Mini PCI card to four-position connector J12 on the
CK30 main PCB. From there, the signals are routed to 26-pin dock
connector J13 and passed on to an RJ45 network connector in the AD1 or
AD2 dock.
The CK30 architecture supports the following internal scan engines and
external tethered scanners.
CK30 Handheld Computer Service Manual