High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
BITS
DESCRIPTION
TYPE
DEFAULT
19
GP Timer (GPT_INT)
This interrupt is issued when the General Purpose Timer Count Register
(GPT_CNT) wraps past zero to FFFFh.
R/WC
0b
18
17
RESERVED
RO
-
Power Management Interrupt Event (PME_INT)
R/WC
0b
This interrupt is issued when a Power Management Event is detected as
configured in the Power Management Control Register (PMT_CTRL). This
interrupt functions independent of the PME signal, and will still function if
the PME signal is disabled. Writing a '1' clears this bit regardless of the
state of the PME hardware signal. In order to clear this bit, all unmasked
bits in the Power Management Control Register (PMT_CTRL) must first be
cleared.
Note:
The Interrupt De-assertion interval does not apply to the PME
interrupt.
16
15
TX Status FIFO Overflow (TXSO)
R/WC
R/WC
0b
0b
This interrupt is generated when the TX Status FIFO overflows.
Receive Watchdog Time-out (RWT)
This interrupt is generated when a packet larger than 2048 bytes has been
received by the Host MAC.
Note:
This can occur when the switch engine adds a tag to a non-tagged
jumbo packet that is originally larger than 2044 bytes.
14
13
12
Receiver Error (RXE)
R/WC
R/WC
RO
0b
0b
0b
Indicates that the Host MAC receiver has encountered an error. Please
refer to Section 9.9.5, "Receiver Errors," on page 136 for a description of
the conditions that will cause an RXE.
Transmitter Error (TXE)
When generated, indicates that the Host MAC transmitter has encountered
an error. Please refer to Section 9.8.8, "Transmitter Errors," on page 131
for a description of the conditions that will cause a TXE.
GPIO Interrupt Event (GPIO)
This bit indicates an interrupt event from the General Purpose I/O. The
source of the interrupt can be determined by polling the General Purpose
I/O Interrupt Status and Enable Register (GPIO_INT_STS_EN)
11
10
TX Data FIFO Underrun Interrupt (TDFU)
R/WC
R/WC
0b
0b
This interrupt is generated when the TX Data FIFO underruns.
TX Data FIFO Overrun Interrupt (TDFO)
This interrupt is generated when the TX Data FIFO is full, and another write
is attempted.
9
TX Data FIFO Available Interrupt (TDFA)
R/WC
0b
This interrupt is generated when the TX Data FIFO available space is
greater than the programmed level in the TX Data Available Level field of
the FIFO Level Interrupt Register (FIFO_INT).
8
7
TX Status FIFO Full Interrupt (TSFF)
R/WC
R/WC
0b
0b
This interrupt is generated when the TX Status FIFO is full.
TX Status FIFO Level Interrupt (TSFL)
This interrupt is generated when the TX Status FIFO reaches the
programmed level in the TX Status Level field of the FIFO Level Interrupt
Register (FIFO_INT).
6
RX Dropped Frame Interrupt (RXDF_INT)
This interrupt is issued whenever a receive frame is dropped by the Host
MAC.
R/WC
0b
SMSC LAN9312
175
Revision 1.2 (04-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
