lrs1830 Sharp Microelectronics of the Americas, lrs1830 Datasheet - Page 81

• Manufacturer Part Number: lrs1830
• Description: Stacked Chip 256m X16 Boot Block Flash And 32m X16 Scram
• Manufacturer: Sharp Microelectronics of the Americas

B-1 POWER UP SEQUENCE OF Smartcombo RAM
B-1.1 Sequence of Smartcombo RAM Power Supply
NOTES:
<Example of the actual connection>
When turning on Smartcombo RAM power supply, the following sequence is needed.
(1) Supply power.
(2) Keep S-CE
(3) Keep S-CE
(4) End of Initialization.
*1) Connect System Reset signal to S-CE
*2) By adding “300µs Wait Routine” (S-CE
By executing above (1) to (4), the initialization of chip inside and the power occurred inside become stable.
longer than or equal to 300µs.
sharp
2
1
S-CE
S-CE
and S-CE
low longer than or equal to 50µs. (See NOTES *1)
V
CC
1
2
2
high longer than or equal to 300µs. (See NOTES *2 )
System Reset
from CPU
Add “300µs
before the first Smartcombo RAM access.
V
2
IH
and hold S-CE
1
V
and S-CE
CC
eed 50µs (Min.)
(*2)
(Min.)
wait routine” by software
2
2
high) in the software, delay the first access to Smartcombo RAM
low longer than or equal to 50µs.
eed 10ns (Min.)
V
(*1)
IH
V
IL
S-CE
S-CE
Combination
F-RST
Need 300µs (Min.)
V
IH
1
2
Memory
(*2)
1st Access to Smartcombo RAM
CC
i