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参数资料
| 型号： | MT46V2M32V1 |
| 厂商： | Micron Technology, Inc. |
| 英文描述： | DOUBLE DATA RATE DDR SDRAM |
| 中文描述： | 双倍数据速率的DDR SDRAM内存 |
| 文件页数： | 5/65页 |
| 文件大小： | 2360K |
| 代理商： | MT46V2M32V1 |
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5
64Mb: x32 DDR SDRAM
2M32DDR-07.p65
–
Rev. 12/01
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2001, Micron Technology, Inc.
64Mb: x32
DDR SDRAM
PIN DESCRIPTIONS
TQFP PIN NUMBERS
55, 54
SYMBOL
CK, CK#
TYPE
Input
DESCRIPTION
Clock: CK and CK# are differential clock inputs. All address and
control input signals are sampled on the crossing of the positive
edge of CK and negative edge of CK#. Output data (DQs and
DQS) is referenced to the crossings of CK and CK#.
Clock Enable: CKE HIGH activates and CKE LOW deactivates the
internal clock, input buffers and output drivers. Taking CKE LOW
provides PRECHARGE POWER-DOWN and SELF REFRESH
operations (all banks idle), or ACTIVE POWER-DOWN (row ACTIVE
in any bank). CKE is synchronous for POWER-DOWN entry and
exit, and for SELF REFRESH entry. CKE is asynchronous for SELF
REFRESH exit and for disabling the outputs. CKE must be
maintained HIGH throughout read and write accesses. Input
buffers (excluding CK, CK# and CKE) are disabled during POWER-
DOWN. Input buffers (excluding CKE) are disabled during SELF
REFRESH. CKE is an SSTL_2 input but will detect an LVCMOS
LOW level after V
DD
is applied.
Chip Select: CS# enables (registered LOW) and disables (regis-
tered HIGH) the command decoder. All commands are masked
when CS# is registered HIGH. CS# provides for external bank
selection on systems with multiple banks. CS# is considered part
of the command code.
Command Inputs: RAS#, CAS#, and WE# (along with CS#) define
the command being entered.
Input Data Mask: DM is an input mask signal for write data. Input
data is masked when DM is sampled HIGH along with that input
data during a WRITE access. DM is sampled on both edges of
DQS. Although DM pins are input-only, the DM loading is
designed to match that of DQ and DQS pins.
Bank Address Inputs: BA0 and BA1 define to which bank an
ACTIVE, READ, WRITE, or PRECHARGE command is being applied.
Address Inputs: Provide the row address for ACTIVE commands,
and the column address and auto precharge bit (A8) for READ/
WRITE commands, to select one location out of the memory array
in the respective bank. A8 sampled during a PRECHARGE
command determines whether the PRECHARGE applies to one
bank (A8 LOW, bank selected by BA0, BA1) or all banks (A8
HIGH). The address inputs also provide the op-code during a
MODE REGISTER SET command. BA0 and BA1 define which mode
register (mode register or extended mode register) is loaded
during the LOAD MODE REGISTER command.
Data Input/Output:
53
CKE
Input
28
CS#
Input
27, 26, 25
RAS#, CAS#, Input
WE#
DM0-DM3 Input
23, 56, 24, 57
29, 30
BA0, BA1
Input
31-34, 47-51, 45, 36
A0-A10
Input
97, 98, 100, 1, 3, 4, 6, 7
60, 61, 63, 64, 68, 69, 71, 72
9, 10, 12, 13, 17, 18, 20, 21
74, 75, 77, 78, 80, 81, 83, 84
DQ0-31
I/O
(continued on next page)
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