GS8672D20BE-450 Datasheet, PDF (9/30 Pages) GSI Technology – Dual Double Data Rate interface

GS8672D20/38BE-633/550/500/450/400
Separate I/O SigmaQuad II+ B4 ECCRAM Truth Table
Previous
Operation
A RW
Current
Operation
D
D
D
D
Q
Q
Q
Q
K
(t_n-1)
Deselect
K
K
K

(t_n) (t_n) (t_n)
X
1
1
K
(t_n)
Deselect
K
(t_n+1)
K
(t_n+1½)
K
(t_n+2)
K
(t_n+2½)
X
X
—
—
K
(t_n+2½)
Hi-Z/0
K
(t_n+3)
K
(t_n+3½)
K
(t_n+4)
Hi-Z/0
—
—
Write
X
1
X
Deselect
D2
D3
—
—
Hi-Z/0
Hi-Z/0
—
—
Read
X
X
1
Deselect
X
X
—
—
Q2
Q3
—
—
Deselect
V
1
0
Write
D0
D1
D2
D3
Hi-Z/0
Hi-Z/0
—
—
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.
6. When On-Die Termination is disabled (ODT = 0), Q drivers are disabled (i.e., Q pins are tri-stated) for one cycle in response to NOP and
Write commands, 2.5 cycles after the command is sampled, except when preceded by a Read command.
7. When On-Die Termination is enabled (ODT = 1), Q drivers are enabled Low (i.e., Q pins are driven Low) for one cycle in response to NOP
and Write commands, 2.5 cycles after the command is sampled, except when preceded by a Read command. This is done so that the ASIC/
Controller can enable On-Die Termination on its data inputs without having to cope with the termination pulling tri-stated data inputs to V_DDQ/
2 (i.e., to the switch point of the data input receivers).
Rev: 1.03c 8/2017
9/30
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2011, GSI Technology