SMSC LAN9312 - Manual (Page 45)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312 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.
Table 4.3 provides a list of
all hard-straps and their associated pin. These straps, along with their pin assignments are also fully
defined in
Chapter 3, "Pin Description and Configuration," on page 26 .
manual_FC_strap_2 Port 2 Manual Flow Control Enable Strap: Configures the
default value of the
Port 2 Full-Duplex Manual Flow Control
Select (MANUAL_FC_2) bit in the Port 2 Manual Flow
Control Register (MANUAL_FC_2) . When configured low,
flow control is determined by auto-negotiation (if enabled),
and symmetric PAUSE is advertised (bit 10 of the
Port x
PHY Auto-Negotiation Advertisement Register
(PHY_AN_ADV_x)
is set).
When configured high, flow control is determined by the
Port 2 Full-Duplex Transmit Flow Control Enable
(TX_FC_2)
and Port 2 Full-Duplex Receive Flow Control
Enable (RX_FC_2) bits, and symmetric PAUSE is not
advertised (bit 10 of the Port x PHY Auto-Negotiation
Advertisement Register (PHY_AN_ADV_x) is cleared).
0b
BP_EN_strap_mii Port 0(Host MAC) Backpressure Enable Strap:
Configures the default value for the
Port 0 Backpressure
Enable (BP_EN_MII) bit of the Port 0(Host MAC) Manual
Flow Control Register (MANUAL_FC_MII) . When
configured low, backpressure is disabled. When configured
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
Port 0(Host MAC) Manual Flow
Control Register (MANUAL_FC_MII) 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.
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
Port 0(Host MAC) Manual Flow Control Register
(MANUAL_FC_MII) . 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
Port 0(Host MAC) Manual Flow
Control Register (MANUAL_FC_MII) .
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
Virtual PHY
Special Control/Status Register
(VPHY_SPECIAL_CONTROL_STATUS)
. When configured
low, SQEOFF defaults to 0 and SQE test is enabled. When
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