38 / 60 page
IP175A LF
Preliminary Data Sheet
38/60
February 20, 2006
Copyright © 2004, IC Plus Corp.
IP175A LF-DS-R08
ROM
MII
Pin name
Description
(Switch control register 1)
Default
EEPROM registers 04H
4.1
Reserved
0
4.0
Reserved
1
ROM
MII
Pin name
Description
(Switch control register 2)
Default
EEPROM registers 05H
5[7:6]
--
--
Reserved
2’b0
5.5
--
--
Reserved
1’b0
5[4:3]
--
--
Bp_kind,
Backpressure type selection
It is valid only if Bk_en (02H[4]) is set to 1’b1.
00: carrier base backpressure
01: collision base backpressure with hashing
10: collision base backpressure without hashing
00
5[2:0]
--
--
Reserved
3’b0
ROM
MII
Pin name
Description
(Switch control register 3)
Default
EEPROM registers 06H
6.7
--
--
No drop16,
A port will drop the transmitting packet after 16 consecutive
collisions if this function is turned on.
1: do not drop, 0: drop
1
6.6
12.0
--
0
6.5
12.4
--
0
6.4
12.3
Aging
(RXD1_2)
Agetime,
Aging time of address table selection
An address tag in hashing table will be dropped if this function
is turned on and its aging timer expires. Aging =bit[4]
0: no aging
1: aging time 300sec (default)
1
6.2
--
--
Twopart,
Turn on twopartD
IP175A LF examine the carrier idle for 64 bits only when it is
back off if this function is turned.
1: turn on, 0: turn off
1
6.1
--
--
Modbck,
Turn on modified back off algorithm
The maximum back off period is limited to 16-slot time if this
function is turned on.
1: turn on (default),
0: turn off
1
6.0
--
--
Reserved
0
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