Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos
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ATSAM4S-XPLD
330
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
21.2.4.2 Read Handshaking
Figure 21-3. SAM4SxB/C (64/100 pins) Parallel Programming Timing, Read Sequence
Table 21-4. 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[7:0]
MODE[3:0]
1
2
3
4
5
6
7
9
8
ADDR
Adress IN
Z
Data OUT
10
11
X
IN
12
13
Table 21-5. Read Handshake
Step
Programmer Action
Device Action
DATA I/O
1
Sets MODE and DATA signals
Waits for NCMD low
Input
2
Clears NCMD signal
Latch MODE and DATA
Input
3
Waits for RDY low
Clears RDY signal
Input
4
Sets DATA signal in tristate
Waits for NOE Low
Input
5
Clears NOE signal
Tristate
6
Waits for NVALID low
Sets DATA bus in output mode and outputs
the flash contents.
the flash contents.
Output
7
Clears NVALID signal
Output
8
Reads value on DATA Bus
Waits for NOE high
Output
9
Sets NOE signal
Output