LAN89218 datasheet(95/148 Pages) MICROCHIP

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DS60001255B-page 95

LAN89218

Flow Control on Any Frame (FCANY). When this bit is set, the LAN89218

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 LAN89218 is operating in full-duplex mode.

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

does not decode the MAC address and will send a pause frame 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 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 5-5:

BACKPRESSURE DURATION BIT MAPPING

Backpressure Duration

[19:16]

100 Mbps Mode

10 Mbps Mode

5 µs

7.2 µs

10 µs

12.2 µs

15 µs

17.2 µs

25 µs

27.2 µs

50 µs

52.2 µs

100 µs

102.2 µs

150 µs

152.2 µs

200 µs

202.2 µs

250 µs

252.2 µs

300 µs

302.2 µs

350 µs

352.2 µs

400 µs

402.2 µs

450 µs

452.2 µs

500 µs

502.2 µs

550 µs

552.2 µs

600 µs

602.2 µs

Bits

Description

Type

Default

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