LAN9312 datasheet(190/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

190

SMSC LAN9312

DATASHEET

Flow Control on Multicast Frame (FCMULT)

When this bit is set, the Host MAC will assert back pressure when the AFC

level is reached and a multicast frame is received. This field has no function

in full-duplex mode.

0: Flow Control on Multicast Frame Disabled

1: Flow Control on Multicast Frame Enabled

R/W

Flow Control on Broadcast Frame (FCBRD)

When this bit is set, the Host MAC will assert back pressure when the AFC

level is reached and a broadcast frame is received. This field has no function

in full-duplex mode.

0: Flow Control on Broadcast Frame Disabled

1: Flow Control on Broadcast Frame Enabled

R/W

Flow Control on Address Decode (FCADD)

When this bit is set, the Host MAC will assert back pressure when the AFC

level is reached and a frame addressed to the Host MAC is received. This

field has no function in full-duplex mode.

0: Flow Control on Address Decode Disabled

1: Flow Control on Address Decode Enabled

R/W

Flow Control on Any Frame (FCANY)

When this bit is set, the Host MAC will assert back pressure, or transmit a

pause frame when the AFC level is reached and any frame is received.

Setting this bit enables full-duplex flow control when the Host MAC is

operating in full-duplex mode.

When this mode is enabled during half-duplex operation, the Flow Controller

does not decode the Host MAC address and will send a JAM upon receipt

of a valid preamble (i.e., immediately at the beginning of the next frame after

the RX Data FIFO level is reached).

When this mode is enabled during full-duplex operation, the Flow Controller

will immediately instruct the Host MAC to send a pause frame when the RX

Data FIFO level is reached. The MAC will queue the pause frame

transmission for the next available window.

Setting this bit overrides bits [3:1] of this register.

R/W

Table 14.2 Backpressure Duration Bit Mapping

BACKPRESSURE DURATION

[7:4]

100Mbs Mode

10Mbs Mode

5uS

7.2uS

10uS

12.2uS

15uS

17.2uS

25uS

27.2uS

50uS

52.2uS

100uS

102.2uS

150uS

152.2uS

200uS

202.2uS

BITS

DESCRIPTION

TYPE

DEFAULT

LAN9312 Datasheet(PDF) 190 Page - SMSC Corporation

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