SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

SMSC LAN9311/LAN9311i

45

Revision 1.4 (08-19-08)

 

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. 

 provides a list of

all hard-straps and their associated pin. These straps, along with their pin assignments are also fully
defined in 

.

manual_FC_strap_2

Port 2 Manual Flow Control Enable Strap: Configures 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 

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 

 bit of the 

. 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 

 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 

. 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 

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 

. 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