Artesyn ATCA-7480 Installation and Use (February 2015) - Manual (Page 159)

Maps and Registers
ATCA-7480 Installation and Use (6806800T17A) 159
5.1.19 PCH Output Enable Register
The output signals, PCH_RCIN_, PCH_SCI_ and PCH_PSTATE_ are connected to the GPIO Pins
of the PCH. After power-up, the PCH drives these signals. To avoid signal contention, the
outputs are tri-stated. After software has configured the PCH GPIO pins as inputs, the
corresponding outputs can be enabled with this Register.
5.1.20 RTM SPI Interface Registers
The signals, RTM_SPI_SCK, RTM_SPI_SS_, RTM_SPI_MISO and RTM_SPI_MOSI are used to
support a SPI master protocol. The signal, RTM_SPI_MISO is also used to signal an ARTM
interrupt to the base board. See Chapter 5.18.4 RTM Interrupt Status Register.
Table 5-78 PCH Output Enable Register
Address Offset: 0x41
Bit Description Default Access
0 PCH_RCIN_ enable:
0: Disabled. Signal is tri-state
1: Enabled. Drive pch_rcin 0 LPC: r/w
1 PCH_SCI_ enable:
0: Disabled. Signal is tri-state
1: Enabled. Drive pch_sci 0 LPC: r/w
2 PCH_PSTATE_ enable:
0: Disabled. Signal is tri-state
1: Enabled. Drive pch_pstate 0 LPC: r/w
7:3 Reserved 0 0
At the moment there is no ARTM with an SPI interface defined.