lan9311 Standard Microsystems Corp., lan9311 Datasheet - Page 193

• Manufacturer Part Number: lan9311
• Description: Lan9311/lan9311i Two Port 10/100 Managed Ethernet Switch With 16-bit Non-pci Cpu Interface
• Manufacturer: Standard Microsystems Corp.

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
14.2.3
14.2.3.1
31:30
29:28
27:16
15:14
BITS
13
12
RESERVED
GPIO 1588 Timer Interrupt Clear Enable 9-8
(GPIO_1588_TIMER_INT_CLEAR_EN[9:8])
These bits enable inputs on GPIO9 and GPIO8 to clear the
1588_TIMER_INT bit of the
(1588_INT_STS_EN). The polarity of these inputs is determined by
GPIO_INT_POL[9:8].
Note:
GPIO Interrupt Polarity 11-0 (GPIO_INT_POL[11:0])
These bits set the interrupt polarity of the 12 GPIO pins. The configured
level (high/low) will set the corresponding GPIO_INT bit in the
Purpose I/O Interrupt Status and Enable Register
0: Sets low logic level trigger on corresponding GPIO pin
1: Sets high logic level trigger on corresponding GPIO pin
GPIO_INT_POL[9:8] also determines the polarity of the GPIO IEEE 1588
time clock capture events and the GPIO 1588 Timer Interrupt Clear inputs.
Refer to
information.
1588 GPIO Output Enable 9-8 (1588_GPIO_OE[9:8])
These bits configure GPIO 9 and GPIO 8 to output 1588 clock compare
events.
0: Disables the output of 1588 clock compare events
1: Enables the output of 1588 clock compare events
Note:
GPIO 9 Clock Event Polarity (GPIO_EVENT_POL_9)
This bit determines if the 1588 clock event output on GPIO 9 is active high
or low.
0: 1588 clock event output active low
1: 1588 clock event output active high
GPIO 8 Clock Event Polarity (GPIO_EVENT_POL_8)
This bit determines if the 1588 clock event output on GPIO 8 is active high
or low.
0: 1588 clock event output active low
1: 1588 clock event output active high
GPIO/LED
This section details the General Purpose I/O (GPIO) and LED related System CSR’s.
General Purpose I/O Configuration Register (GPIO_CFG)
This read/write register configures the GPIO input and output pins. The polarity of the 12 GPIO pins
is configured here as well as the IEEE 1588 timestamping and clock compare event output properties
of the GPIO[9:8] pins.
Section 13.2, "GPIO Operation," on page 163
The GPIO must be configured as an input for this function to
operate. For the clear function, GPIO inputs are edge sensitive and
must be active for greater than 40 nS to be recognized.
These bits override the direction bits in the
Data & Direction Register (GPIO_DATA_DIR)
the GPIO buffer type (GPIOBUF[11:0]) in the
Configuration Register (GPIO_CFG)
Offset:
1588 Interrupt Status and Enable Register
1E0h
DESCRIPTION
DATASHEET
193
is not overridden.
Size:
(GPIO_INT_STS_EN).
General Purpose I/O
General Purpose I/O
register. However,
for additional
General
32 bits
TYPE
R/W
R/W
R/W
R/W
R/W
RO
Revision 1.2 (04-08-08)
DEFAULT
00b
0h
0h
1b
1b
-