LAN9311 Datasheet, PDF (31/461 Pages) SMSC Corporation – Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Table 3.4 Host Bus Interface Pins (continued)
BUFFER
PIN
NAME
SYMBOL
TYPE
DESCRIPTION
Data FIFO
Direct Access
Select
FIFO_SEL
60
Endianess
Select
END_SEL
61
IS
Data FIFO Direct Access Select: When driven
high, all accesses to the LAN9311/LAN9311i are
directed to the RX and TX Data FIFO’s. All reads
are from the RX Data FIFO, and all writes are to
the TX Data FIFO. In this mode, the address input
is ignored. Refer to Section 14.1.3, "Direct FIFO
Access Mode," on page 168 for additional
information.
IS
Endianess Select: When this signal is set high,
big endian mode is selected. When low, little
endian mode is selected. This signal may be
dynamically changed or held static. Refer to
Chapter 8, "Host Bus Interface (HBI)," on page 99
for additional information.
Note: Refer to Chapter 8, "Host Bus Interface (HBI)," on page 99 for additional information regarding
the use of these signals.
Table 3.5 EEPROM Pins
BUFFER
PIN
NAME
SYMBOL
TYPE
DESCRIPTION
EEPROM
Microwire
Data Input
EEDI
IS
(PD)
EEPROM Microwire Data Input (EEDI): In
Microwire EEPROM mode (EEPROM_TYPE = 0),
this pin is the Microwire EEPROM serial data input.
EEPROM I²C
EE_SDA
IS/OD8 EEPROM I²C Serial Data Input/Output
96
Serial Data
Input/Output
(EE_SDA): In I²C EEPROM mode
(EEPROM_TYPE = 1), this pin is the I²C EEPROM
serial data input/output.
Note: If I²C is selected, an external pull-up is
required when using an EEPROM and is
recommended if no EEPROM is attached.
EEPROM
Microwire
Data Output
EEDO
98
O8
EEPROM Microwire Data Output: In Microwire
EEPROM mode (EEPROM_TYPE = 0), this pin is
the Microwire EEPROM serial data output.
Note: In I²C mode (EEPROM_TYPE=1), this pin
is not used and is driven low.
Note:
When not using a Microwire or I²C
EEPROM, an external pull-down resistor
is recommended on this pin.
EEPROM
Type Strap
EEPROM_TYPE
IS
Note 3.3
EEPROM Type Strap: Configures the EEPROM
type. See Note 3.4
0
1
=
=
MI_{2CicrMoowdiree}
Mode
Note: When not using a Microwire or I²C
EEPROM, an external pull-down resistor
is recommended on this pin.
SMSC LAN9311/LAN9311i
31
DATASHEET
Revision 2.0 (02-14-13)