Datasheet

128
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
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
Figure 20-6. SAM7S32/16 Parallel Programming Timing, Read Sequence
Table 20-4. Write Handshake
Step Programmer Action Device Action Data I/O
1 Sets MODE and DATA signals Waits for NCMD low Input
2 Clears NCMD signal Latches MODE and DATA Input
3 Waits for RDY low Clears RDY signal Input
4 Releases MODE and DATA signals Executes command and polls NCMD high Input
5 Sets NCMD signal Executes command and polls NCMD high Input
6 Waits for RDY high Sets RDY Input
NCMD
RDY
NOE
NVALID
DATA[15:0]
MODE[3:0]
1
2
3
4
5
6
7
9
8
ADDR
Adress IN Z
Data OUT
10
11
XIN
12
13
NCMD
RDY
NOE
NVALID
DATA[7:0]
MODE[3:0]
1
2
3
4
5
6
7
9
8
ADDR
Adress IN Z
Data OUT
10
11
XIN
12
13