Read Handshaking

For details on the read handshaking sequence, refer to the following figure and table.

Figure 1. Parallel Programming Timing, Read Sequence
Table 1. 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. Output
7 – Clears NVALID signal Output
8 Reads value on DATA Bus Waits for NOE high Output
9 Sets NOE signal – Output
10 Waits for NVALID high Sets DATA bus in input mode X
11 Sets DATA in output mode Sets NVALID signal Input
12 Sets NCMD signal Waits for NCMD high Input
13 Waits for RDY high Sets RDY signal Input
Parent topic: Programmer Handshaking