W3H32M64EA-XSBX
ADVANCED
TABLE 3 – TRUTH TABLE - DDR2 COMMANDS
Notes: 1–3 apply to the entire table
CKE
BA2
BA0
An
A11
Function
CS#
RAS#
CAS#
WE#
A10
A9-A0
Notes
Previous
Cycle
Current
Cycle
LOAD MODE
REFRESH
H
H
H
H
H
L
L
L
L
H
L
L
L
L
L
L
L
X
H
L
L
L
L
L
L
H
H
X
H
L
BA
X
OP Code
4, 6
X
X
X
X
X
X
SELF-REFRESH Entry
L
X
X
H
H
H
H
SELF-REFRESH Exit
L
H
X
X
X
X
4, 7
6
Single bank precharge
All banks PRECHARGE
Bank activate
H
H
H
H
H
H
BA
X
X
X
L
H
X
X
L
H
BA
Row Address
4
Column
Address
Column
Address
WRITE
H
H
H
H
H
H
H
H
L
L
L
L
L
H
H
H
H
L
L
L
L
L
BA
BA
BA
BA
L
H
L
4, 5, 6, 8
Column
Address
Column
Address
WRITE with auto precharge
READ
4, 5, 6, 8
4, 5, 6, 8
4, 5, 6, 8
Column
Address
Column
Address
H
H
Column
Address
Column
Address
READ with auto precharge
H
NO OPERATION
H
H
X
X
L
H
H
L
H
X
X
H
X
H
H
X
X
H
X
H
H
X
X
H
X
H
X
X
X
X
X
X
X
X
Device DESELECT
POWER-DOWN entry
H
L
L
X
X
X
X
X
X
X
X
9
9
H
L
POWER-DOWN exit
H
Notes:
1. All DDR2 SDRAM commands are defined by states of CS#, RAS#, CAS#, WE#, and CKE at the rising edge of the clock.
2. The state of ODT does not affect the states described in this table. The ODT function is not available during self refresh.
3. “X” means “H or L” (but a defined logic level) for valid IDD measurements.
4. BA2 is only applicable for densities ≥1Gb.
5. An n is the most significant address bit for a given density and configuration. Some larger address bits may be “Don’t Care” during column addressing, depending on density and configuration.
6. Bank addresses (BA) determine which bank is to be operated upon. BA during a LOAD MODE command selects which mode register is programmed.
7. SELF REFRESH exit is asynchronous.
8. Burst reads or writes at BL = 4 cannot be terminated or interrupted.
9. The power-down mode does not perform any REFRESH operations. The duration of powerdown is limited by the refresh requirements outlined in the AC parametric section.
Microsemi Corporation reserves the right to change products or specifications without notice.
August 2011 © 2011 Microsemi Corporation. All rights reserved.
Rev.1
14
Microsemi Corporation • (602) 437-1520 • www.microsemi.com
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