SMSC LAN9312 - Manual (Page 174)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 174 SMSC LAN9312
DATASHEET
14.2.1.2 Interrupt Status Register (INT_STS)
This register contains the current status of the generated interrupts. A value of 1 indicates the
corresponding interrupt conditions have been met, while a value of 0 indicates the interrupt conditions
have not been met. The bits of this register reflect the status of the interrupt source regardless of
whether the source has been enabled as an interrupt in the
Interrupt Enable Register (INT_EN) . Where
indicated as R/WC, writing a 1 to the corresponding bits acknowledges and clears the interrupt.
Offset: 058h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31 Software Interrupt (SW_INT)
This interrupt is generated when the SW_INT_EN bit of the
Interrupt Enable
Register (INT_EN) is set high. Writing a one clears this interrupt.
R/WC 0b
30 Device Ready (READY)
This interrupt indicates that the LAN9312 is ready to be accessed after a
power-up or reset condition. R/WC 0b
29 1588 Interrupt Event (1588_EVNT)
This bit indicates an interrupt event from the IEEE 1588 module. This bit
should be used in conjunction with the
1588 Interrupt Status and Enable
Register (1588_INT_STS_EN) to determine the source of the interrupt
event within the 1588 module.
RO 0b
28 Switch Fabric Interrupt Event (SWITCH_INT)
This bit indicates an interrupt event from the Switch Fabric. This bit should
be used in conjunction with the
Switch Global Interrupt Pending Register
(SW_IPR) to determine the source of the interrupt event within the Switch
Fabric.
RO 0b
27 Port 2 PHY Interrupt Event (PHY_INT2)
This bit indicates an interrupt event from the Port 2 PHY. The source of the
interrupt can be determined by polling the
Port x PHY Interrupt Source
Flags Register (PHY_INTERRUPT_SOURCE_x) .
RO 0b
26 Port 1 PHY Interrupt Event (PHY_INT1)
This bit indicates an interrupt event from the Port 1 PHY. The source of the
interrupt can be determined by polling the
Port x PHY Interrupt Source
Flags Register (PHY_INTERRUPT_SOURCE_x) .
RO 0b
25 TX Stopped (TXSTOP_INT)
This interrupt is issued when STOP_TX bit in
Transmit Configuration
Register (TX_CFG) is set, and the Host MAC transmitter is halted.
R/WC 0b
24 RX Stopped (RXSTOP_INT)
T his interrupt is issued when the Host MAC receiver is halted.
R/WC 0b
23 RX Dropped Frame Counter Halfway (RXDFH_INT)
This interrupt is issued when the
Host MAC RX Dropped Frames Counter
Register (RX_DROP) counts past its halfway point (7FFFFFFFh to
80000000h).
R/WC 0b
22 RESERVED RO -
21 TX IOC Interrupt (TX_IOC)
This interrupt is generated when a buffer with the IOC flag set has been
fully loaded into the TX Data FIFO. R/WC 0b
20 RX DMA Interrupt (RXD_INT)
This interrupt is issued when the amount of data programmed in the RX
DMA Count (RX_DMA_CNT) field of the
Receive Configuration Register
(RX_CFG) has been transferred out of the RX Data FIFO.
R/WC 0b