AX88170L ASIX [ASIX Electronics Corporation], AX88170L Datasheet - Page 9

• Manufacturer Part Number: AX88170L
• Description: USB to Fast Ethernet/HomePNA Controller
• Manufacturer: ASIX [ASIX Electronics Corporation]

2.4 RMII interface signal pins (PHY mode)
When /S_RMII=0 and /S_MAC=1
RXD[1:0]
CRS_DV
TXD[1:0]
TX_EN
REF_CLK
Tab – 5 RMII interface signal pins (PHY mode)
2.5 Miscellaneous pins group
25M_XIN
25M_XOUT
48M_XIN
48M_XOUT
25M_CLKO
/RST
/S_RMII
/S_MAC
/S_FDPX
S_EXT
SPD_UP
SIGNAL
SIGNAL
AX88170
TYPE
I/PU
I/PD
TYPE
O
O
I/PD
I/PU
I/PD
I/PD
I/PD
I
ID
O
O
O
I
I
PIN NO.
27, 26
19, 18
PIN NO.
15
22
16
35
36
52
51
33
43
4
9
8
7
6
Receive Data : Basically RXD[1:0] is transformed from TXD[1:0] of MAC
mode of RMII interface.
Carrier Sense _ Data Valid : Basically CRS_DV is transformed of TX_EN
from MAC mode of RMII interface.
Transmit Data : Basically TXD[1:0] is transformed from RXD[1:0] of MAC
mode of RMII interface.
Transmit Enable : Basically TX_EN is transformed from RX_DV from MAC
mode of RMII interface.
Reference clock : The input is a continue clock at 50Mhz for timing
reference with RMII interface.
CMOS Local Clock : Typical a 25Mhz clock, +/- 100 ppm, 40%-60% duty
cycle. ( See application note also )
Crystal Oscillator Input : Typical a 25Mhz crystal, +/- 25 ppm can be
connected across 25M_XIN and 25M_XOUT.
Crystal Oscillator Output : Typical a 25Mhz crystal, +/- 25 ppm can be
connected across 25M_XIN and 25M_XOUT. If a single-ended external
clock is connected to 25M_XIN, the crystal output pin should be left
floating.
48Mhz CMOS Clock In : Typical a 48Mhz clock, +/- 500 ppm, 40%-60% duty
cycle. ( See application note also )
48Mhz Crystal Oscillator Input: Typical a 48Mhz crystal, +/- 100 ppm can be
connected across 48M_XIN and 48M_XOUT.
48Mhz Crystal Oscillator Output: Typical a 48Mhz crystal, +/- 100 ppm can
be connected across 48M_XIN and 48M_XOUT. If a single-ended external
clock is connected to 48M_XIN, the crystal output pin should be left
floating.
Clock Output : This clock is source from 25M_XIN.
Reset:
Reset is active low then place AX88170 into reset mode immediately.
During Rising edge the AX88170 loads the EEPROM data.
Set to RMII mode:
0: RMII mode is selected.
1: MII mode is selected. (default)
Set MII/RMII interface to MAC mode:
0: MAC mode is selected. (default)
1: PHY mode is selected.
Set duplex mode when PHY mode is selected or When S_EXT is set and
MAC mode is selected:
0: full-duplex mode is selected. (default)
1: half-duplex mode is selected.
Select where duplex mode is sourced from when MAC mode:
0: duplex mode depands on internal register. (default)
1: duplex mode depands on external signal /S_FDPX
The setting is enable speed up test mode:
9
DESCRIPTION
DESCRIPTION
ASIX ELECTRONICS CORPORATION
PRELIMINARY
CONFIDENTIAL