QuadMo747-x2000
QuadMo747-x2000 User Manual - Rev. First Edition: 1.0 - Last Edition: 2.0 - Author: S.B. - Reviewed by G.G. Copyright © 2014 SECO S.r.l.
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3.2.3.11
LPC interface signals
According to Qseven
®
specifications rel. 2.0, on the golden card edge connector there are 8 pins that are used for implementation of Low Pin Count (LPC) Bus
interface.
The following signals are available:
LPC_AD[0÷3]: LPC address, command and data bus, bidirectional signal, +3.3V_S electrical level.
LPC_CLK: LPC Clock Output line, +3.3V_S electrical level. Since only a clock line is available, if you need to connect more LPC devices on the carrier board, then
you have to provide for a zero-delay clock buffer to connect all clock lines to the single clock output of Qseven
®
module.
LPC_LDRQ#: LPC DMA Request line, +3.3V_S electrical level input.
LPC_FRAME#: LPC Frame indicator, active low output line, +3.3V_S electrical level. This signal is used to signal the start of a new cycle of transmission, or the
termination of existing cycles due to abort or time-out condition.
SERIRQ: LPC Serialised IRQ request, bidirectional line, +3.3V_S electrical level. This signal is used only by peripherals requiring Interrupt support.
3.2.3.12
SPI interface signals
According to newest Qseven
®
Rel. 2.0 specifications, QuadMo747-x2000 can optionally offer one SPI interface, which is derived from NM10 Express Chipset
’
s
USB port #6 by using the same USB-to-Serial bridge (Cypress CY7C65215) used for deriving the UART interface (see par. 3.2.3.2). The SPI interface is derived by
device
’
s serial port #1.
This interface can be used for connection of EEPROMs and Serial Flash devices, but it does not support platform firmware (BIOS).
SPI interface supports master mode, with speed up to 3MHz.
Signals involved with SPI management are the following:
SPI_MOSI: SPI Master Out Slave In, Output from Qseven
®
module to SPI devices embedded on the Carrier Board. Electrical level +3.3V_S.
SPI_MISO: SPI Master In Slave Out, Input to Qseven
®
module from SPI devices embedded on the Carrier Board. Electrical level +3.3V_S.
SPI_CLK: SPI Clock Output to carrier board
’
s SPI embedded devices. Electrical level +3.3V_S.
SPI_CS0#: SPI Chip select, active low output signal (+3.3V_S electrical level with a 10k
Ω
pull-up resistor).
Warning: Although the Qseven
®
specification states that pins 185-192 can be used for the implementation of the LPC bus or as 8 GPIOs, this
option is intended only for the manufacturers of the modules who are free to choose the option they deem more appropriate.
On the QuadMo747-x2000 module, the aforementioned pins have been dedicated to the LPC bus; use of these pins for different implementations
other than LPC (i.e. as GPIOs) is therefore not possible.
