Chapter 4 — Theory of Operation
In-System Programmability of Programmable Devices
FPGA
The SRAM-based FPGA supports two programming models.
In normal operation, the FPGA is downloaded at boot time and on every
resume by the FPGA download driver running on the PXA255 processor.
See “FPGA Download” on page 48 for details.
For debug purposes (for instance, if the OS is not running), the FPGA can
be also programmed via the JTAG port using the 073048 JTAG board
described in “Field-Access Debug Port” on page 93.
PSC PIC
The flash-based firmware in the Power Supply Controller may be
reprogrammed using proprietary programming tools from Microchip
(ProMate II programmer with an AC004004 adapter module, and
MPLAB development environment software). The programming signals
are accessible through debug port P1 using the 073048 JTAG board
described in “Field-Access Debug Port” on page 93.
Accessories
All of the docks/chargers use the same Texas Instrument L-ion charging
chip (BQ2954). In regards to charging, the only difference between all of
these accessories is the amount of charge current.
The power supply lump (073573) is also common to all docks and
chargers. The lump supplies up to 4.15A @ 12 VDC.
Connector Pin-Outs
Male DB9 Serial Connector
Pin No. Signal Name I/O to Terminal Description
1 DCD I Data Carrier Detect
2 RXD I RS-232 RXD
3 TXD O RS-232 TXD
4 DTR O RS-232 DTR
5 GND -- Ground
6 DSR I RS-232 DSR
7 RTS O RS-232 RTS
8 CTS I RS-232 CTS
9 N/C -- --
96 CK30 Handheld Computer Service Manual
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