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2.3.1
Power
When reading this section, refer to the daughter card schematic diagram.
2.3.1.1
Power Sources
®
The Intel
Table 6.
Power Sources on the Intel
Source
main board
External +5 VDC
2.3.2
SRAM
The daughter card provides 2 Mbytes of static random-access memory in addition to the SRAM
integrated into the daughter card. This low-power SRAM, with relatively slow access time (70 ns),
is representative of the type typically found in low-power devices. The card-level SRAM maps to
the upper half of the Processor chip select nCS2.
2.3.3
Programmable Daughter Card Logic (CPLD1)
A Xilinx complex programmable logic device (CPLD) contains the logic for controlling the
daughter card memory-bus transceiver's JTAG chaining and MSL/PCMCIA signal mixing. This
device can interface with two signaling-voltage levels.
For information on programming CPLD1, see
Logic Devices" on page
2.3.4
Stand-Alone I/O Interface
When the daughter card operates in stand-alone mode, the RS-232 serial port (see
provides the interface to a host computer or other serial device at speeds up to 115 kbps. The JTAG
interface (see
2.3.5
Full-Featured RS-232 Serial Port
®
The Intel
connector via a Maxim RS-232 transceiver. For programming details, see the FFUART chapter in
®
the Intel
®
Intel
PXA27x Processor Developer's Kit - User's Guide
PXA270 Processor can derive power from any of the sources described in
®
PXA27x Processor Developer's Kit Daughter Card
Connector
or
Description
Component
To power the Intel
on J22 between pins 1 and 3, and between pins 2 and 4 (see the Intel
J22
PXA270 Processor schematic diagram). This is the default setting for J22.
The default main board supply voltage is 5V.
To power the Intel
1. CAUTION: Turn off the main board power and remove the Intel
J23
PXA270 Processor from the main board.
2. Connect a 5-volt, 2-amp source to J23.
85.
Section
2.3.6) provides debugging and software downloading.
PXA270 Processor Full-Featured UART controller connects to a standard DB-9
PXA27x Processor Family Developer's Manual.
®
PXA270 Processor from the main board, install jumpers
®
PXA270 Processor from an external power supply:
Section 3.6, "Programming Flash Memory and
Table
6.
®
®
Section
2.3.5)
39
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