Table of Contents
Advertisement
Table 17-14 PROM Mode Commands
Command Name
Memory read mode
Auto-program mode
Auto-erase mode
Status read mode
Legend:
RA: Read address
PA: Program address
Notes: 1. In auto-program mode, 129 cycles are required for command writing by a simultaneous
128-byte write.
2. In memory read mode, the number of cycles depends on the number of address write
cycles (n).
17.11.4 Memory Read Mode
• After the end of an auto-program, auto-erase, or status read operation, the command wait state
is entered. To read memory contents, a transition must be made to memory read mode by
means of a command write before the read is executed.
• Command writes can be performed in memory read mode, just as in the command wait state.
• Once memory read mode has been entered, consecutive reads can be performed.
• After power-on, memory read mode is entered.
Table 17-15 AC Characteristics in Memory Read Mode
(Conditions: V
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
WE rise time
WE fall time
584
Number
of Cycles
Mode
1 + n
Write
129
Write
2
Write
2
Write
= 3.3 V ±0.3 V, V
CC
Symbol
t
nxtc
t
ceh
t
ces
t
dh
t
ds
t
wep
t
r
t
f
1st Cycle
Address Data
X
H'00
X
H'40
X
H'20
X
H'71
= 25°C ±5°C)
= 0 V, T
SS
a
Min
Max
Unit
µs
20
0
ns
0
ns
50
ns
50
ns
70
ns
30
ns
30
ns
2nd Cycle
Mode
Address Data
Read
RA
Write
PA
Write
X
Write
X
Notes
Dout
Din
H'20
H'71
Advertisement
Table of Contents
