GS8342D38BGD-500I Datasheet, PDF (9/30 Pages) GSI Technology – JEDEC-standard pinout and package

GS8342D06/11/20/38BD-550/500/450/400/350
Separate I/O SigmaQuad II+ B4 SRAM Truth Table
Previous
Operation
A
R
W
Current
Operation
D
D
D
D
Q
Q
Q
Q
K
K K K
K
K
K
K
K
K
K
K
K
(t_n-1)
(t_n) (t_n) (t_n)
(t_n)
(t_n+1) (t_n+1½) (t_n+2) (t_n+2½)
(t_n+2½)
(t_n+3)
(t_n+3½)
(t_n+4)
Deselect
X
1
1
Deselect
X
X
—
—
Hi-Z
Hi-Z
—
—
Write
X
1
X
Deselect
D2
D3
—
—
Hi-Z
Hi-Z
—
—
Read
X
X
1
Deselect
X
X
—
—
Q2
Q3
—
—
Deselect
V
1
0
Write
D0
D1
D2
D3
Hi-Z
Hi-Z
—
—
Deselect
V
0
X
Read
X
X
—
—
Q0
Q1
Q2
Q3
Read
V
X
0
Write
D0
D1
D2
D3
Q2
Q3
—
—
Write
V
0
X
Read
D2
D3
—
—
Q0
Q1
Q2
Q3
Notes:
1. “1” = input “high”; “0” = input “low”; “V” = input “valid”; “X” = input “don’t care”
2. “—” indicates that the input requirement or output state is determined by the next operation.
3. Q0, Q1, Q2, and Q3 indicate the first, second, third, and fourth pieces of output data transferred during Read operations.
4. D0, D1, D2, and D3 indicate the first, second, third, and fourth pieces of input data transferred during Write operations.
5. Users should not clock in metastable addresses.
Byte Write Clock Truth Table
BW
BW
BW
BW
Current Operation
D
D
D
D
K
(t_n+1)
T
K
(t_n+1½)
T
K
(t_n+2)
T
K
(t_n+2½)
T
K
(t_n)
Write
Dx stored if BWn = 0 in all four data transfers
K
(t_n+1)
D0
K
(t_n+1½)
D2
K
(t_n+2)
D3
K
(t_n+2½)
D4
T
F
F
F
Write
Dx stored if BWn = 0 in 1st data transfer only
D0
X
X
X
F
T
F
F
Write
Dx stored if BWn = 0 in 2nd data transfer only
X
D1
X
X
F
F
T
F
Write
Dx stored if BWn = 0 in 3rd data transfer only
X
X
D2
X
F
F
F
T
Write
Dx stored if BWn = 0 in 4th data transfer only
X
X
X
D3
F
F
F
F
Write Abort
No Dx stored in any of the four data transfers
X
X
X
X
Notes:
1. “1” = input “high”; “0” = input “low”; “X” = input “don’t care”; “T” = input “true”; “F” = input “false”.
2. If one or more BWn = 0, then BW = “T”, else BW = “F”.
Rev: 1.02c 8/2017
9/30
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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