Kontron KTA55/pITX, Руководство пользователя

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KTD-S0031-E Page 25 LPC Bus
KTA55/pITX
User's Guide
13 LPC Bus
The LPC bus (Low Pin Count) is used to connect low bandwith devices to the compagnion chip. This bus is
replacing the 16 bit-wide, 8.33 MHz ISA bus with a 4 bit-wide bus operating at 4 times the clock speed (33
MHz PCI bus clock frequency).
You can use the LPC bus to expand the board functionality (e.g. Lattice LPC bus controller (LPC peripheral),
ROM emulator or LPC to SPI bridge).
CAUTION!
Do not use signal voltages above 3.3V. LPC bus signals are
unprotected against overvoltage.
13.1 Connector
The LPC bus interface is available through the connector J1800 (10 pins).
Header Pin Signal Name Function
1 VCC
1)
Power +3.3V
2
/RESET
Reset
3 LCLK Clock
4
/LFRAME
Start or stop transfer
5
LAD0
Address or data 0
6 LAD1 Address or data 1
7
LAD2
Address or data 2
8 LAD3 Address or data 3
9
SERIRQ
Serial interrupt
1
10 GND Ground
Note:
1)
To protect the external power lines of peripheral devices make sure that
- the wires have the right diameter to withstand the maximum available current.
- the enclosure of the peripheral device fulfills the fire-protecting conditions of IEC/EN 60950.