SAM7S256_14 Datasheet, PDF (128/775 Pages) ATMEL Corporation – ARM-based Flash MCU

Table 20-4. Write Handshake
Step
Programmer Action
1
Sets MODE and DATA signals
2
Clears NCMD signal
3
Waits for RDY low
4
Releases MODE and DATA signals
5
Sets NCMD signal
6
Waits for RDY high
Device Action
Waits for NCMD low
Latches MODE and DATA
Clears RDY signal
Executes command and polls NCMD high
Executes command and polls NCMD high
Sets RDY
Data I/O
Input
Input
Input
Input
Input
Input
20.2.4.2 Read Handshaking
For details on the read handshaking sequence, refer to Figure 20-5, Figure 20-6 and Table 20-5.
Figure 20-5. SAM7S542/256/128/321/161 Parallel Programming Timing, Read Sequence
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
Figure 20-6. SAM7S32/16 Parallel Programming Timing, Read Sequence
NCMD
2
3
RDY
NOE
NVALID
DATA[7:0]
1
MODE[3:0]
5
4
Adress IN
Z
ADDR
12
13
9
7
11
6
8
10
Data OUT X
IN
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
128