IDT70V261S/L
High-Speed 16K x 16 Dual-Port Static RAM with Interrupt
Industrial and Commercial Temperature Ranges
Timing Waveform of Semaphore Read after Write Timing, Either Side
(1)
t
SAA
A
0
-A
2
VALID ADDRESS
t
WR
t
AW
t
EW
t
DW
DATA
IN
VALID
t
AS
R/W
t
SWRD
OE
Write Cycle
Read Cycle
3040 drw 09
t
OH
VALID ADDRESS
t
ACE
t
SOP
DATA
OUT
VALID
(2)
SEM
I/O
0
t
WP
t
DH
t
AOE
NOTES:
1.
CE
= V
IH
or
UB
&
LB
= V
IH
for the duration of the above timing (both write and read cycle).
2. “DATA
OUT
VALID” represents all I/O's (I/O
0
-I/O
15
) equal to the semaphore value.
Timing Waveform of Semaphore Write Contention
(1,3,4)
A
0"A"
-A
2"A"
MATCH
SIDE
(2)
"A"
R/W
"A"
SEM
"A"
t
SPS
A
0"B"
-A
2"B"
MATCH
SIDE
(2)
"B"
R/W
"B"
SEM
"B"
3040 drw 10
NOTES:
1. D
OR
= D
OL
= V
IL
,
CE
R
=
CE
L
= V
IH
, or both
UB
&
LB
= V
IH
.
2. All timing is the same for left and right ports. Port “A” may be either left or right port. Port “B” is the opposite from port “A”.
3. This parameter is measured from R/W
"A"
or
SEM
"A"
going HIGH to R/W
"B"
or
SEM
"B"
going HIGH.
4. If t
SPS
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.
9
6.42
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
