SMSC LAN9312 - Manual (Page 52)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 52 SMSC LAN9312
DATASHEET
5.2.3 Ethernet PHY Interrupts
The Port 1 and Port 2 PHYs each provide a set of identical interrupt sources. The top-level PHY_INT1
(bit 26) and PHY_INT2 (bit 27) of the
Interrupt Status Register (INT_STS) provides indication that a
P H Y i n t e r r u p t e v e n t o c c u r r e d i n t h e P o r t x P H Y I n t e r r u p t S o u r c e F l a g s R e g i s t e r
(PHY_INTERRUPT_SOURCE_x) .
Port 1 and Port 2 PHY interrupts are enabled/disabled via their respective Port x PHY Interrupt Mask
Register (PHY_INTERRUPT_MASK_x) . The source of a PHY interrupt can be determined and cleared
via the Port x PHY Interrupt Source Flags Register (PHY_INTERRUPT_SOURCE_x) . The Port 1 and
Port 2 PHYs are each capable of generating unique interrupts based on the following events:
„ ENERGYON Activated
„ Auto-Negotiation Complete
„ Remote Fault Detected
„ Link Down (Link Status Negated)
„ Auto-Negotiation LP Acknowledge
„ Parallel Detection Fault
„ Auto-Negotiation Page Received
In order for a Port 1 or Port 2 interrupt event to trigger the external IRQ interrupt pin, the desired PHY
interrupt event must be enabled in the corresponding
Port x PHY Interrupt Mask Register
(PHY_INTERRUPT_MASK_x) , the PHY_INT1(Port 1 PHY) and/or PHY_INT2(Port 2 PHY) bits 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) .
For additional details on the Ethernet PHY interrupts, refer to Section 7.2.8.1, "PHY Interrupts," on
page 94 .
5.2.4 GPIO Interrupts
Each GPIO[11:0] of the LAN9312 is provided with its own interrupt. The top-level GPIO (bit 12) of the
Interrupt Status Register (INT_STS) provides indication that a GPIO interrupt event occurred in the
General Purpose I/O Interrupt Status and Enable Register (GPIO_INT_STS_EN) . The General
Purpose I/O Interrupt Status and Enable Register (GPIO_INT_STS_EN) provides enabling/disabling
and status of each GPIO[11:0] interrupt.
In order for a GPIO interrupt event to trigger the external IRQ interrupt pin, the desired GPIO interrupt
m u s t b e e n a b l e d i n t h e
G e n e r a l P u r p o s e I / O I n t e r r u p t Stat u s a n d E n a b le Re g i s t e r
(GPIO_INT_STS_EN) , bit 12 (GPIO_EN) 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) .
For additional details on the GPIO interrupts, refer to Section 13.2.2, "GPIO Interrupts," on page 163 .
5.2.5 Host MAC Interrupts
The top-level Interrupt Status Register (INT_STS) , and Interrupt Enable Register (INT_EN) provide the
status and enabling/disabling of multiple Host MAC related interrupts. All Host MAC interrupts are
monitored and configured directly within these two registers. The following Host MAC related interrupt
events are supported:
„ TX Stopped
„ RX Stopped
„ RX Dropped Frame Counter Halfway
„ TX IOC
„ RX DMA