IP175A LF
Preliminary Data Sheet
30/60
February 20, 2006
Copyright © 2004, IC Plus Corp.
IP175A LF-DS-R08
4.10
Extended MII registers
MII
ROM
Function
R/W
Description
Default
MII register 12H (18D)
12.15
12.14
2.1
2.0
LED_SEL [1:0]
R/W
Led_sel,
LED mode selection.
LED_SEL[1:0]=2’b00: LED mode 0,
LED_SEL[1:0]=2’b01: LED mode 1,
LED_SEL[1:0]=2’b10: LED mode 2,
LED_SEL[1:0]=2’b11: LED mode 3 (default)
2’b11
12.13
4.7
X_EN
R/W
X_en,
IEEE 802.3x flow control enable
This signal is used as pause_en for digital parts.
1: enable, 0:disable
1
12.12
4.4
BK_EN
R/W
Bk_en,
Backpressure enable
1: enable, 0: disable
1
12.11
4.2
BF_STM_EN
R/W
Broadcast storm enable
1: enable
Drop the incoming packet if the number of queued
broadcast
packet
is
over
the
threshold.
The
threshold is defined in register 0AH[14:13].
0: disable
0
12.10
4.3
MAC_X_EN
R/W
MII0 flow control enable
1: enable,
0: disable
1
12.7
--
MII_REGISTER_
EN
R/W
1: select MII register
0: select EEPROM register
This bit should not be enabled until the contents of
MII registers are all filled with correct value.
0
12.6
B.4
UPDATE_R4_EN
R/W
Update_r4_en,
Change capability enable
A full duplex port will change its capability to half
duplex, if the remote full duplex port does not
support 802.3x and this function is enable.
1: enable, 0: disable
0
12.4
6.5
Reserved
R/W
0
12.3
6.4
AGING
R/W
Aging time,
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
12.2
--
MII0_SPEED
RO
Speed of MII0
1: 100M
0: 10M
It is speed of MII0 if P4_EXT is enabled. It is speed
of port4 if P4EXT is disabled
0
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