IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
66/111
Mar 09, 2007
Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
2.21
MII registers of Switch controller
PHY
MII
ROM
R/W
Description
Default
29
18.15
18.14
2.1
2.0
R/W LED_SEL [1:0]
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)
It is for debug only. User should not update the setting of
LED_SEL pins by writing this registers.
Pin92,
Pin91
X_EN
IEEE 802.3x flow control enable
This signal is used as pause_en for digital parts.
1: enable (default), 0:disable
Default value
TEST2=0
TEST2=1
Pin113 MII2_EN=1 Pin113 MII2_EN=0
29
18.13
4.7
R/W
1
Pin100 X_EN (1)
1
*
BK_EN,
Backpressure enable
1: enable (default), 0: disable
Default value
TEST2=0
TEST2=1
Pin113 MII2_EN=1 Pin113 MII2_EN=0
29
18.12
4.4
R/W
1
Pin100 X_EN (1)
1
*
BF_STM_EN, 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 MII
register 30.11[15:14].
0: disable (default)
Default value
TEST2=0
TEST2=1
Pin113=1
Pin113 MII2_EN=0
LAT_IN_DIS=1
LAT_IN_DIS=0
29
18.11
4.2
R/W
0
Pin102
BF_STM_EN (0)
0
0
*
MAC_X_EN, flow control enable of MII0 and MII2
1: enable (default),
0: disable
Default value
TEST2=0
TEST2=1
Pin74 P4EXT=1
Pin74 P4EXT =0
29
18.10
4.3
R/W
1
Pin67 MAC_X_EN (1)
0
*
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