SMSC LAN9312 - Manual (Page 54)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 54 SMSC LAN9312
DATASHEET
5.2.8 Software Interrupt
A general purpose software interrupt is provided in the top level Interrupt Status Register (INT_STS)
and Interrupt Enable Register (INT_EN) . The SW_INT interrupt (bit 31) of the Interrupt Status Register
(INT_STS) is generated when SW_INT_EN (bit 31) of the Interrupt Enable Register (INT_EN) is set.
This interrupt provides an easy way for software to generate an interrupt, and is designed for general
software usage.
5.2.9 Device Ready Interrupt
A device ready interrupt is provided in the top-level Interrupt Status Register (INT_STS) and Interrupt
Enable Register (INT_EN) . The READY interrupt (bit 30) of the Interrupt Status Register (INT_STS)
indicates that the LAN9312 is ready to be accessed after a power-up or reset condition. Writing a 1 to
this bit in the
Interrupt Status Register (INT_STS) will clear it.
In order for a device ready interrupt event to trigger the external IRQ interrupt pin, bit 30 of the Interrupt
Enable Register (INT_EN) must be set, and IRQ output must be enabled via bit 8 (IRQ_EN) of the
Interrupt Configuration Register (IRQ_CFG) .