TS-5500 User’s Manual
Technologic Systems
10/31/03
7
host PC for file transfers. This results in the ability to quickly move files from a host PC to the TS-5500
using a Compact Flash card as the removable media. Since the Compact Flash card appears as a
standard IDE drive on the TS-5500, it uses no additional RAM for drivers. While a USB Compact Flash
reader allows for hot swapping of the Compact Flash card on the host PC, the Compact Flash interface
on the TS-5500 is not hot swappable, the TS-5500 must be rebooted after removing or installing a
Compact Flash card.
The DiskOnChip module can be installed into the 32-pin socket near the center of the board.
DiskOnChip modules are available from Technologic Systems as well as other distributors. It is
compatible with DOS as shipped, and drivers for other operating systems (such as Linux) are available.
If a DiskOnChip is installed, it will simply appear as drive C. The DiskOnChip is accessed through an 8
KB range of memory at D0000h through D1FFFh. If you are installing a PC/104 daughter card that uses
memory mapped I/O, it must not conflict with this address range
if the DiskOnChip is installed.
Additionally, in a DOS environment the DiskOnChip firmware uses approximately 30 KB of user RAM
(below 640 KB).
4.4
Using the SanDisk USB Compact Flash Card Reader
This device allows for a very fast and reliable method of moving files between the host PC and target
SBC (TS-5500). The Compact Flash (CF) card can then be hot swapped (inserted or removed without
rebooting the host PC). Sometimes it is necessary to unplug the USB cable and reinstall it after
swapping CF cards (at least Windows ME seems to prefer this).
Note:
The TS-5500 always needs to be powered off before swapping CF cards.
4.5
Non-Volatile SRAM
The 32-pin socket can also optionally hold 32 KB of Non-volatile SRAM memory. This behaves exactly
like battery-backed SRAM. This or the DiskOnChip may be installed, but not both.
Non-volatile SRAM provides non-volatile memory with unlimited write cycles and no write time
degradation, unlike Flash memory. The SRAM uses an additional 32 KB range of D0000h through
D7FFFh. If the SRAM is installed, PC/104 daughter card that uses memory mapped I/O must not
conflict with this address range.
I/O location 75h, bit 0 can be read to determine whether the SRAM option is installed; a ‘1’ in bit 0
indicates that it is installed, a ‘0’ that it is not.
5 Serial Ports
The three PC compatible asynchronous serial ports (COM1, COM2 and COM3) provide a means to
communicate with external serial devices such as printers, modems, etc. Each is independently
configured as a standard PC COM port that is compatible with the National Semiconductor NS16C450.
Alternatively, these ports can be changed to the 16C550 mode with 16 byte FIFOs in both the receive
and transmit UART channels. COM1 appears in the I/O space at 3F8h – 3FFh and uses IRQ4. COM2
is located at 2F8h – 2FFh and uses IRQ3. COM3 appears in the I/O space at 3E8h-3EFh and can be
jumper selected to use IRQ5, IRQ6, or IRQ7.
By changing an internal configuration register in the Elan520, the serial clock to the COM ports can be
switched to a 10 times rate (18.432 MHz). This feature allows baud rates higher than 115 Kbaud (such
as 230K baud or 576K baud), as well as non-standard lower baud rates (such as 24 Kbaud). See
Appendix G for further information.
The COM1 and COM2 ports may also be configured to use a DMA channel, which may be useful when
very high baud rates are being used.
See the AMD Elan520 User's Manual for further details.
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