Port 2 manual flow control register (manual_fc_2), Port 2 backpressure enable, Bp_en_2) – SMSC LAN9312 User Manual
Page 231: Bit of the, Port 2 manual flow control register, Manual_fc_2), E of the, Port 2 full-duplex, Transmit flow control enable (tx_fc_2), Port 2 full
High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312
231
Revision 1.4 (08-19-08)
DATASHEET
14.2.6.2
Port 2 Manual Flow Control Register (MANUAL_FC_2)
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
)
within the PHY are not affected by the values of this register.
Offset:
1A4h
Size:
32 bits
BITS
DESCRIPTION
TYPE
DEFAULT
31:7
RESERVED
RO
-
6
Port 2 Backpressure Enable (BP_EN_2)
This bit enables/disables the generation of half-duplex backpressure on
switch Port 2.
0: Disable backpressure
1: Enable backpressure
R/W
5
Port 2 Current Duplex (CUR_DUP_2)
This bit indicates the actual duplex setting of switch Port 2.
0: Full-Duplex
1: Half-Duplex
RO
4
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
RO
3
Port 2 Current Transmit Flow Control Enable (CUR_TX_FC_2)
This bit indicates the actual transmit flow setting of switch Port 2.
0: Flow control transmit is currently disabled
1: Flow control transmit is currently enabled
RO
2
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.
0: Disable flow control receive
1: Enable flow control receive
R/W
1
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.
0: Disable flow control transmit
1: Enable flow control transmit
R/W
0
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
R/W