SAM7X128_14 Datasheet, PDF (116/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Figure 20-2. Parallel Programming Timing, Write Sequence
NCMD
RDY
NOE
NVALID
2
3
DATA[15:0]
1
MODE[3:0]
4
5
Table 20-4. Write Handshake
Step
Programmer Action
Device Action
1
Sets MODE and DATA signals
Waits for NCMD low
2
Clears NCMD signal
Latches MODE and DATA
3
Waits for RDY low
Clears RDY signal
4
Releases MODE and DATA signals
Executes command and polls NCMD high
5
Sets NCMD signal
Executes command and polls NCMD high
6
Waits for RDY high
Sets RDY
20.2.4.2 Read Handshaking
For details on the read handshaking sequence, refer to Figure 20-3 and Table 20-5.
Figure 20-3. Parallel Programming Timing, Read Sequence
Data I/O
Input
Input
Input
Input
Input
Input
NCMD
2
3
RDY
NOE
NVALID
DATA[15:0]
1
MODE[3:0]
5
4
Adress IN
Z
ADDR
12
13
9
7
11
6
8
10
Data OUT X
IN
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
116