IDT70T3539M
High-Speed 2.5V 512K x 36 Dual-Port Synchronous Static RAM
Waveform of Collision Timing (1,2)
CLK L
t OFS
Industrial and Commercial Temperature Ranges
t SA
t HA
(4)
ADDRESS L
A 0
A 1
A 2
A 3
COL L
CLK R
t OFS
t COLS
(3)
t COLR
t SA
t HA
ADDRESS R
(4)
A 0
A 1
A 2
A 3
t COLS
t COLR
COL R
5678 drw 20
NOTES:
1. CE 0 = V IL , CE 1 = V IH .
2. For reading port, OE is a Don't care on the Collision Detection Logic. Please refer to Truth Table IV for specific cases.
3. Leading Port Output flag might output 3t CYC 2 + t COLS after Address match.
4. Address is for internal register, not the external bus, i.e., address needs to be qualified by one of the Address counter control signals.
Collision Detection Timing (3,4)
Cycle Time
Region 1 (ns)
(1)
t OFS (ns)
Region 2 (ns) (2)
NOTES:
1. Region 1
Both ports show collision after 2nd cycle for Addresses 0, 2, 4 etc.
5ns
0 - 2.8
2.81 - 4.6
2. Region 2
Leading port shows collision after 3rd cycle for addresses 0, 3, 6, etc.
6ns
0 - 3.8
3.81 - 5.6
while trailing port shows collision after 2nd cycle for addresses 0, 2, 4 etc.
3. All the production units are tested to midpoint of each region.
7.5ns
0 - 5.3
5.31 - 7.1
4. These ranges are based on characterization of a typical device.
5678 tbl 13
Truth Table IV — Collision Detection Flag
Left Port
Right Port
R/ W R
CLK L
R/ W L
(1)
CE L
(1)
A 18L -A 0L
(2)
COL L
CLK R
(1)
CE R (1)
A 18R -A 0R (2)
COL R
Function
H
H
L
L
L
L
L
L
MATCH
MATCH
MATCH
MATCH
H
L
H
L
H
L
H
L
L
L
L
L
MATCH
MATCH
MATCH
MATCH
H
H
L
L
Both ports reading. Not a valid collision.
No flag output on either port.
Left port reading, Right port writing.
Valid collision, flag output on Left port.
Right port reading, Left port writing.
Valid collision, flag output on Right port.
Both ports writing. Valid collision. Flag
output on both ports.
NOTES:
1. CE 0 = V IL and CE 1 = V IH . R/ W and CE are synchronous with respect to the clock and need valid set-up and hold times.
2. Address is for internal register, not the external bus, i.e., address needs to be qualified by one of the Address counter control signals.
19
6.42
5678 tbl 14
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