Memory ICs
•Input / output circuits
(1) Input circuits
RESET int.
CS
CS int.
DI
(2) Output circuits
BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F /
BR9040 / BR9040F
CS int.
SK
WC
OE int.
DO
∗ DO: BR9010 / F / FV
BR9020 / F
OE int.
DO
∗ DO: BR9040 / F
R/B
R / B: BR9020 / F, BR9040 / F
•Circuit operation
(1) Command mode
Command
Read
(READ)
Write
(WRITE)
Erase / Write enabled (EWEN)
Erase / Write disable (EWDS)
∗ Either VIH or VIL
With BR9020 / F,
With BR9010 / F / FV,
ଝ1 is ‘0’
ଝ1 and 2 are ‘0’
Start bit
1010
1010
1010
1010
Operating code
1000
0100
0011
0000
Address
A0 A1 A2 A3 A4 A5 (A6) ଝ2 (A7) ଝ1
A0 A1 A2 A3 A4 A5 (A6) ଝ2 (A7) ଝ1
∗∗∗∗∗∗∗ ∗
∗∗∗∗∗∗∗ ∗
Data
D0 D1—D14 D15
10