IDT7028 Integrated Device Technology, IDT7028 Datasheet - Page 13

• Manufacturer Part Number: IDT7028
• Description: 64k X16 Dual-port Ram
• Manufacturer: Integrated Device Technology

Waveform of Interrupt Timing
NOTES:
1. All timing is the same for left and right ports. Port “A” may be either the left or right port. Port “B” is the port opposite from port “A”.
2. See Interrupt Truth Table.
3. Timing depends on which enable signal (CE or R/W) is asserted last.
4. Timing depends on which enable signal (CE or R/W) is de-asserted first.
5. Refer to Chip Enable Truth Table.
Truth Table IV — Interrupt Flag
NOTES:
1. Assumes BUSY
2. If BUSY
3. If BUSY
4. INT
5. Refer to Chip Enable Truth Table.
IDT7028L
High-Speed 64K x 16 Dual-Port Static RAM
ADDR
R/W
ADDR
X
X
X
L
R/W
L
L
INT
CE
INT
and INT
CE
OE
L
R
"A"
"A"
"A"
"B"
= V
"B"
"B"
"B"
= V
"B"
CE
IL
R
IL
X
X
L
L
, then no change.
, then no change.
must be initialized at power-up.
L
L
= BUSY
Left Port
OE
R
X
X
X
L
=V
L
IH
.
A
15L
FFFF
FFFE
X
X
-A
t
AS
t
0L
AS
t
(3)
INS
INTERRUPT CLEAR ADDRESS
t
(3)
INR
INTERRUPT SET ADDRESS
(3)
(3)
INT
L
H
X
X
(3)
(2)
L
(1,5)
R/W
(1,4,5)
X
X
X
L
R
t
WC
t
RC
6.42
13
CE
X
X
L
L
R
Right Port
OE
X
X
X
L
(2)
(2)
R
t
WR
Industrial and Commercial Temperature Ranges
(4)
A
15R
FFFE
FFFF
X
X
-A
0R
INT
H
L
X
X
(2)
(3
R
)
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
4836 drw 16
4836 drw 15
Function
L
R
Flag
L
Flag
R
Flag
Flag
4836 tbl 16