SMSC LAN9311 User Manual
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
45
Revision 1.4 (08-19-08)
DATASHEET
4.2.4.2
Hard-Straps
Hard-straps are latched upon Power-On Reset (POR) or pin reset (nRST) only. Unlike soft-straps,
hard-straps always have an associated pin and cannot be overridden by the EEPROM Loader. These
straps are used as either direct configuration values or as register defaults.
hard-straps always have an associated pin and cannot be overridden by the EEPROM Loader. These
straps are used as either direct configuration values or as register defaults.
provides a list of
all hard-straps and their associated pin. These straps, along with their pin assignments are also fully
defined in
defined in
.
manual_FC_strap_2
Port 2 Manual Flow Control Enable Strap: Configures the
default value of the
default value of the
bit in the
. When configured low,
flow control is determined by auto-negotiation (if enabled),
and symmetric PAUSE is advertised (bit 10 of the
and symmetric PAUSE is advertised (bit 10 of the
When configured high, flow control is determined by the
bits, and symmetric PAUSE is not
advertised (bit 10 of the
is cleared).
0b
BP_EN_strap_mii
Port 0(Host MAC) Backpressure Enable Strap:
Configures the default value for the
Configures the default value for the
. When
configured low, backpressure is disabled. When configured
high, backpressure is enabled.
high, backpressure is enabled.
1b
FD_FC_strap_mii
Port 0(Host MAC) Full-Duplex Flow Control Enable
Strap: Configures the default of the TX_FC_MII and
RX_FC_MII bits in the
Strap: Configures the default of the TX_FC_MII and
RX_FC_MII bits in the
which are used when
manual full-duplex flow control is selected. When
configured low, flow control is disabled on RX/TX. When
configured high, flow control is enabled on RX/TX.
configured low, flow control is disabled on RX/TX. When
configured high, flow control is enabled on RX/TX.
1b
manual_FC_strap_mii
Port 0(Host MAC) Manual Flow Control Enable Strap:
Configures the default value of the MANUAL_FC_MII bit in
the
Configures the default value of the MANUAL_FC_MII bit in
the
. When configured low, flow control is
determined by Virtual Auto-Negotiation (if enabled). When
configured high, flow control is determined by TX_FC_MII
and RX_FC_MII bits in the
configured high, flow control is determined by TX_FC_MII
and RX_FC_MII bits in the
0b
SQE_test_disable_strap_mii
SQE Heartbeat Disable Strap: Configures the Signal
Quality Error (Heartbeat) test function by controlling the
default value of the SQEOFF (bit 0) of the
Quality Error (Heartbeat) test function by controlling the
default value of the SQEOFF (bit 0) of the
. When configured
low, SQEOFF defaults to 0 and SQE test is enabled. When
configured high, SQEOFF defaults to 1 and SQE test is
disabled.
configured high, SQEOFF defaults to 1 and SQE test is
disabled.
0b
Table 4.2 Soft-Strap Configuration Strap Definitions (continued)
STRAP NAME
DESCRIPTION
PIN / DEFAULT
VALUE
VALUE