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參數資料
| 型號： | WEDPN8M64V-133B2C |
| 廠商： | MICROSEMI CORP-PMG MICROELECTRONICS |
| 元件分類： | DRAM |
| 英文描述： | 8M X 64 SYNCHRONOUS DRAM, 5.5 ns, PBGA219 |
| 封裝： | 21 X 21 MM, PLASTIC, BGA-219 |
| 文件頁數： | 13/15頁 |
| 文件大?。?/td> | 398K |
| 代理商： | WEDPN8M64V-133B2C |
WEDPN8M64V-XB2X
7
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
January 2005
Rev. 2
LOAD MODE REGISTER command can only be issued
when all banks are idle, and a subsequent executable
command cannot be issued until tMRD is met.
ACTIVE
The ACTIVE command is used to open (or activate) a row in
a particular bank for a subsequent access. The value on the
BA0, BA1 inputs selects the bank, and the address provided
on inputs A0-11 selects the row. This row remains active
(or open) for accesses until a PRECHARGE command is
issued to that bank. A PRECHARGE command must be
issued before opening a different row in the same bank.
READ
The READ command is used to initiate a burst read
access to an active row. The value on the BA0, BA1 inputs
selects the bank, and the address provided on inputs A0-8
selects the starting column location. The value on input A10
determines whether or not AUTO PRECHARGE is used. If
AUTO PRECHARGE is selected, the row being accessed
will be precharged at the end of the READ burst; if AUTO
PRECHARGE is not selected, the row will remain open
for subsequent accesses. Read data appears on the I/Os
subject to the logic level on the DQM inputs two clocks
earlier. If a given DQM signal was registered HIGH, the
COMMANDS
The Truth Table provides a quick reference of available
commands. This is followed by a written description of
each command. Three additional Truth Tables appear
following the Operation section; these tables provide
current state/next state information.
COMMAND INHIBIT
The COMMAND INHIBIT function prevents new commands
from being executed by the SDRAM, regardless of whether
the CLK signal is enabled. The SDRAM is effectively
deselected. Operations already in progress are not
affected.
NO OPERATION (NOP)
The NO OPERATION (NOP) command is used to perform
a NOP to an SDRAM which is selected (CS# is LOW). This
prevents unwanted commands from being registered during
idle or wait states. Operations already in progress are not
affected.
LOAD MODE REGISTER
The Mode Register is loaded via inputs A0-11. See Mode
Register heading in the Register Denition section. The
NOTES:
1.
CKE is HIGH for all commands shown except SELF REFRESH.
2.
A0-11 dene the op-code written to the Mode Register.
3.
A0-11 provide row address, and BA0, BA1 determine which bank is made active.
4.
A0-8 provide column address; A10 HIGH enables the auto precharge feature
(nonpersistent), while A10 LOW disables the auto precharge feature; BA0, BA1
determine which bank is being read from or written to.
5.
A10 LOW: BA0, BA1 determine the bank being precharged. A10 HIGH: All banks
precharged and BA0, BA1 are “Don’t Care.”
6.
This command is AUTO REFRESH if CKE is HIGH; SELF REFRESH if CKE is
LOW.
7.
Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t
Care” except for CKE.
8.
Activates or deactivates the I/Os during WRITEs (zero-clock delay) and READs
(two-clock delay).
TRUTH TABLE – COMMANDS AND DQM OPERATION (NOTE 1)
NAME (FUNCTION)
CS#
RAS#
CAS#
WE#
DQM
ADDR
I/Os
COMMAND INHIBIT (NOP)
H
X
NO OPERATION (NOP)
L
H
X
ACTIVE (Select bank and activate row) (3)
L
H
X
Bank/Row
X
READ (Select bank and column, and start READ burst) (4)
L
H
L
H
L/H 8
Bank/Col
X
WRITE (Select bank and column, and start WRITE burst) (4)
L
H
L
L/H 8
Bank/Col
Valid
BURST TERMINATE
L
H
L
X
Active
PRECHARGE (Deactivate row in bank or banks) (5)
L
H
L
X
Code
X
AUTO REFRESH or SELF REFRESH (Enter self refresh mode) (6, 7)
L
H
X
LOAD MODE REGISTER (2)
L
X
Op-Code
X
Write Enable/Output Enable (8)
––––
L
–
Active
Write Inhibit/Output High-Z (8)
––––
H
–
High-Z
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相關代理商/技術參數 |
參數描述 |
|---|---|
| WEDPN8M64V-133B2I | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx64 Synchronous DRAM |
| WEDPN8M64V-133B2M | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx64 Synchronous DRAM |
| WEDPN8M64V-133BC | 制造商:Microsemi Corporation 功能描述:8M X 64 SDRAM MODULE, 3.3V, 133 MHZ, 219 PBGA 25MM X 25MM, C - Bulk |
| WEDPN8M64VR-XBX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Registered SDRAM MCP |
| WEDPN8M64V-XB2X | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx64 Synchronous DRAM |
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