Allwinner A20 - NFC Timing Diagram

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 301 / 812
2.2.3. NFC Timing Diagram
Typically, there are two kinds of serial access method. One method is conventional method which
fetching data at the rise edge of NFC_RE# signal line. Another one is EDO type which fetching data
at the next fall edge of NFC_RE# signal line.
Conventional Serial Access after Read Cycle (SAM0)
Data(0)
Data(n-1)
sample n-1sample 0
t10
t13
t14
t12
t14
t12
t4t3
NFC_CLE
NFC_CE#
NFC_WE#
NFC_RE#
NFC_ALE
NFC_RB#
NFC_IOx
EDO type Serial Access after Read Cycle (SAM1)
Data(0)
Data(n-1)
sample 0
t10
t13
t14
t12
t14
t12
t4t3
NFC_CLE
NFC_CE#
NFC_WE#
NFC_RE#
NFC_ALE
NFC_RB#
NFC_IOx