AX88179
USB 3.0 to 10/100/1000M Gigabit Ethernet Controller
7.4 Power-up Sequence
At power-up, the AX88179 requires the VCC33A/VCC33IO/VCC3IO/VCC33A_X/VCC33A_G power supply to
rise to nominal operating voltage within Trise3 and the VCC12 (Note) power supply to rise to nominal operating
voltage within Trise2.
Trise3
3.3V
0V
VCC33A/VCC33IO/VCC3IO/
VCC33A_X/VCC33A_G
Tdelay32
Trise2
1.2V
0V
VCC12
Trst_pu
RESET_N
Tclk
XTL25P/ XTL25N
Note: The VCC12 includes VCCK, VCC12A, and VCC12A_X/TX/RX.
Symbol
Trise3
Trise2
Tdelay32
Tclk
Parameter
Condition
From 0V to 3.3V
From 0V to 1.2V
Min
-
-
-5
-
Typ Max Unit
3.3V power supply rise time
1.2V power supply rise time
3.3V rise to 1.2V rise time delay
-
-
10
10
5
ms
ms
ms
ms
-
25MHz crystal oscillator stable From VCC3IO = 3.3V to stable clock
1
-
time
period of XTA25P or XTAL25N
From VCC12 = 1.2V and VCC3IO =
3.3V to RESET_N going high
Trst_pu
RESET_N low level interval
time from power-up
Tclk +
-
-
ms
Trst *1
*1 : Please refer to Section 7.5.2 Reset Timing for the details about the Trst.
56
Copyright © 2011-2012 ASIX Electronics Corporation. All rights reserved.
ASIX [ ASIX ELECTRONICS CORPORATION ]
