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Figure 51: Bank Read – Without Auto Precharge
CK
CK#
CKE
A10
Bank address
tCK
tCH
tCL
RA
tRCD
tRAS3
tRC
tRP
CL = 3
DM
T0
T1
T2
T3
T4
T5
T7n
T8n
T6
T7
T8
DQ8
DQS, DQS#
Case 1: tAC (MIN) and tDQSCK (MIN)
Case 2: tAC (MAX) and tDQSCK (MAX)
DQ8
DQS, DQS#
tRPRE
tRPST
tDQSCK (MIN)
tLZ (MIN)
tLZ (MAX)
tAC (MIN)
tLZ (MIN)
DO
n
tHZ (MAX)
tAC (MAX)
tLZ (MIN)
DO
n
NOP1
Command
ACT
RA
Col n
PRE3
Bank x
RA
Bank x
Bank x6
7
ACT
Bank x
NOP1
tHZ (MIN)
One bank
All banks
Don’t Care
Transitioning Data
READ2
Address
5
tRTP4
tRPST
tDQSCK (MAX)
T9
Notes: 1. NOP commands are shown for ease of illustration; other commands may be valid at
these times.
2. BL = 4 and AL = 0 in the case shown.
3. The PRECHARGE command can only be applied at T6 if tRAS (MIN) is met.
4. READ-to-PRECHARGE = AL + BL/2 - 2CK + MAX (tRTP/tCK or 2CK).
5. Disable auto precharge.
6.
“Don’t Care” if A10 is HIGH at T5.
7. I/O balls, when entering or exiting High-Z, are not referenced to a specific voltage level,
but to when the device begins to drive or no longer drives, respectively.
8. DO n = data-out from column n; subsequent elements are applied in the programmed
order.
1Gb: x4, x8, x16 DDR2 SDRAM
READ
PDF: 09005aef821ae8bf
Rev. P 1/09 EN
101
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2004 Micron Technology, Inc. All rights reserved.