IDT7028 Integrated Device Technology, IDT7028 Datasheet - Page 9

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

Timing Waveform of Semaphore Write Contention
Timing Waveform of Semaphore Read after Write Timing, Either Side
NOTES:
1. CE = V
2. "DATA
NOTES:
1. D
2. All timing is the same for left and right ports. Port "A" may be either left or right port. "B" is the opposite from port "A".
3. This parameter is measured from R/W
4. If t
IDT7028L
High-Speed 64K x 16 Dual-Port Static RAM
OR
SPS
= D
OUT
is not satisfied, the semaphore will fall positively to one side or the other, but there is no guarantee which side will obtain the flag.
IH
OL
DATA
or UB and LB = V
VALID" represents all I/O's (I/O
A
= V
SEM
R/W
0
-A
OE
IL
, CE
2
0
SIDE
SIDE
L
= CE
(2)
(2)
R
IH
= V
"A"
"B"
for the duration of the above timing (both write and read cycle) (Refer to Chip Enable Truth Table).
IH
or both UB and LB = V
"A"
A
A
t
or SEM
VALID ADDRESS
AS
0
0"A"
0"B"
- I/O
SEM
SEM
R/W
R/W
t
-A
-A
AW
15
"A"
Write Cycle
2"A"
2"B"
) equal to the semaphore value.
"A"
"A"
"B"
"B"
going HIGH to R/W
t
t
EW
WP
DATA
IH
(Refer to Chip Enable Truth Table).
t
DW
IN
t
WR
VALID
t
DH
MATCH
"B"
or SEM
6.42
9
t
SWRD
"B"
MATCH
going HIGH.
VALID ADDRESS
t
t
SOP
Read Cycle
SOP
t
SAA
t
SPS
Industrial and Commercial Temperature Ranges
t
t
ACE
AOE
(1,3,4)
DATA
VALID
OUT
(2)
4836 drw 10
t
OH
4836 drw 09
(1)