High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Table 3.4 Host Bus Interface Pins (continued)
BUFFER
TYPE
PIN
NAME
SYMBOL
DESCRIPTION
Data FIFO
Direct Access
Select
FIFO_SEL
IS
Data FIFO Direct Access Select: When driven
high, all accesses to the LAN9312 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 167 for additional information.
60
Endianess
Select
END_SEL
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.
61
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.
96
EEPROM I2C
Serial Data
Input/Output
EE_SDA
EEDO
IS/OD8
O8
EEPROM I2C Serial Data Input/Output
(EE_SDA): In I2C EEPROM mode
(EEPROM_TYPE = 1), this pin is the I2C EEPROM
serial data input/output.
EEPROM
Microwire
Data Output
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.
98
EEPROM_TYPE
EECLK
EEPROM
Type Strap
IS
EEPROM Type Strap: Configures the EEPROM
type. See Note 3.4
Note 3.3
0 = Microwire Mode
1 = I2C Mode
EEPROM
Microwire
Serial Clock
O8
EEPROM Microwire Serial Clock (EECLK): In
Microwire EEPROM mode (EEPROM_TYPE = 0),
this pin is the Microwire EEPROM clock output.
EEPROM I2C
Serial Clock
EE_SCL
IS/OD8
EEPROM I2C Serial Clock (EE_SCL): In I2C
EEPROM mode (EEPROM_TYPE=1), this pin is
the I2C EEPROM clock input/open-drain output.
99
EEPROM_SIZE_1
EEPROM
Size Strap 1
IS
Note 3.5
EEPROM Size Strap 1: Configures the high bit of
the EEPROM size range as specified in Section
10.2, "I2C/Microwire Master EEPROM Controller,"
on page 137. This bit is not used for I2C
EEPROMs. See Note 3.4.
SMSC LAN9312
Revision 1.2 (04-08-08)
DATA3S1HEET
SMSC [ SMSC CORPORATION ]
