LAN9730 Datasheet, PDF (137/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
Bits
Description
7:4 Back Pressure Duration (BACK_DUR)
This field is used to select the time period for the Back Pressure Duration
Timer. This field has no function in full-duplex mode.
Note: Back Pressure Duration is slightly greater in 10 Mbs mode.
Back Pressure Duration
100 Mbps Mode:
0h = 5 µs
1h = 10 µs
2h = 15 µs
3h = 25 µs
4h = 50 µs
5h = 100 µs
6h = 150 µs
7h = 200 µs
8h = 250 µs
9h = 300 µs
Ah = 350 µs
Bh = 400 µs
Ch = 450 µs
Dh = 500 µs
Eh = 550 µs
Fh = 600 µs
10 Mbps Mode:
0h = 7.2 µs
1h = 12.2 µs
2h = 17.2 µs
3h = 27.2 µs
4h = 52.2 µs
5h = 102.2 µs
6h = 152.2 µs
7h = 202.2 µs
8h = 252.2 µs
9h = 302.2 µs
Ah = 352.2 µs
Bh = 402.2 µs
Ch = 452.2 µs
Dh = 502.2 µs
Eh = 552.2 µs
Fh = 602.2 µs
3 Flow Control on Multicast Frame (FCMULT)
When this bit is set, the device 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.
2 Flow Control on Broadcast Frame (FCBRD)
When this bit is set, the device 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.
1 Flow Control on Address Decode (FCADD)
When this bit is set, the device will assert back pressure when the AFC level is
reached and a frame addressed to the device is received. This field has no
function in full-duplex mode.
Type
R/W
R/W
R/W
R/W
Default
0h
0b
0b
0b
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DS00001946A-page 137