High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.2.6.2
Port 2 Manual Flow Control Register (MANUAL_FC_2)
Offset:
1A4h
Size:
32 bits
This read/write register allows for the manual configuration of the switch Port 2 flow control. This
register also provides read back of the currently enabled flow control settings, whether set manually
or Auto-Negotiated. Refer to Section 6.2.3, "Flow Control Enable Logic," on page 58 for additional
information.
Note: The flow control values in the PHY_AN_ADV_2 register (see Section 14.4.2.5, on page 294)
within the PHY are not affected by the values of this register.
BITS
DESCRIPTION
TYPE
DEFAULT
31:7
6
RESERVED
RO
-
Port 2 Backpressure Enable (BP_EN_2)
This bit enables/disables the generation of half-duplex backpressure on
switch Port 2.
R/W
Note 14.8
0: Disable backpressure
1: Enable backpressure
5
4
3
2
Port 2 Current Duplex (CUR_DUP_2)
RO
RO
Note 14.9
Note 14.9
Note 14.9
Note 14.10
This bit indicates the actual duplex setting of switch Port 2.
0: Full-Duplex
1: Half-Duplex
Port 2 Current Receive Flow Control Enable (CUR_RX_FC_2)
This bit indicates the actual receive flow setting of switch Port 2.
0: Flow control receive is currently disabled
1: Flow control receive is currently enabled
Port 2 Current Transmit Flow Control Enable (CUR_TX_FC_2)
This bit indicates the actual transmit flow setting of switch Port 2.
RO
0: Flow control transmit is currently disabled
1: Flow control transmit is currently enabled
Port 2 Full-Duplex Receive Flow Control Enable (RX_FC_2)
When the MANUAL_FC_2 bit is set, or Auto-Negotiation is disabled, this bit
enables/disables the detection of full-duplex Pause packets on switch Port 2.
R/W
0: Disable flow control receive
1: Enable flow control receive
1
0
Port 2 Full-Duplex Transmit Flow Control Enable (TX_FC_2)
When the MANUAL_FC_2 bit is set, or Auto-Negotiation is disabled, this bit
enables/disables full-duplex Pause packets to be generated on switch Port
2.
R/W
R/W
Note 14.10
Note 14.11
0: Disable flow control transmit
1: Enable flow control transmit
Port 2 Full-Duplex Manual Flow Control Select (MANUAL_FC_2)
This bit toggles flow control selection between manual and auto-negotiation.
0: If auto-negotiation is enabled, the auto-negotiation function
determines the flow control of switch Port 2 (RX_FC_2 and TX_FC_2
values ignored). If auto-negotiation is disabled, the RX_FC_2 and
TX_FC_2 values are used.
1: TX_FC_2 and RX_FC_2 bits determine the flow control of switch Port
2 when in full-duplex mode
SMSC LAN9312
231
Revision 1.2 (04-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
