MT47H64M8CB-5E:B Micron Technology Inc, MT47H64M8CB-5E:B Datasheet - Page 60

• Manufacturer Part Number: MT47H64M8CB-5E:B
• Description: IC DDR2 SDRAM 512MBIT 5NS 60FBGA
• Manufacturer: Micron Technology Inc

Specifications of MT47H64M8CB-5E:B

• Format - Memory: RAM
• Memory Type: DDR2 SDRAM
• Memory Size: 512M (64M x 8)
• Speed: 5ns
• Interface: Parallel
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 60-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Precharge
PRECHARGE Command
PRECHARGE Operation
Figure 42:
PDF: 09005aef8117c18e, Source: 09005aef8211b2e6
512MbDDR2_2.fm - Rev. K 8/06 EN
PRECHARGE Command
Note:
The PRECHARGE command, illustrated in Figure 42 on page 60, is used to deactivate the
open row in a particular bank or the open row in all banks. The bank(s) will be available
for a subsequent row activation a specified time (
is issued, except in the case of concurrent auto precharge, where a READ or WRITE
command to a different bank is allowed as long as it does not interrupt the data transfer
in the current bank and does not violate any other timing parameters. Once a bank has
been precharged, it is in the idle state and must be activated prior to any READ or WRITE
commands being issued to that bank. A PRECHARGE command is allowed if there is no
open row in that bank (idle state) or if the previously open row is already in the process
of precharging. However, the precharge period will be determined by the last
PRECHARGE command issued to the bank.
Input A10 determines whether one or all banks are to be precharged, and in the case
where only one bank is to be precharged, inputs BA1–BA0 select the bank. Otherwise
BA1–BA0 are treated as “Don’t Care.”
When all banks are to be precharged, inputs BA1–BA0 are treated as “Don’t Care.” Once a
bank has been precharged, it is in the idle state and must be activated prior to any READ
or WRITE commands being issued to that bank.
PRECHARGE (ALL) command is issued, regardless of the number of banks already open
or closed. If a single-bank PRECHARGE command is issued,
BA0, BA1
ADDRESS
CAS#
RAS#
BA = bank address (if A10 is LOW; otherwise “Don’t Care”).
WE#
A10
CKE
CK#
CS#
CK
HIGH
ALL BANKS
ONE BANK
DON’T CARE
BA
60
Micron Technology, Inc., reserves the right to change products or specifications without notice.
512Mb: x4, x8, x16 DDR2 SDRAM
t
RPA timing applies when the
t
RP) after the PRECHARGE command
t
RP timing applies.
©2004 Micron Technology, Inc. All rights reserved.
Precharge