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PDF W9412G2IB Data sheet ( Hoja de datos )
| Número de pieza | W9412G2IB | |
| Descripción | 1M X 4 BANKS X 32 BITS GDDR SDRAM | |
| Fabricantes | Winbond | |
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W9412G2IB
1M × 4 BANKS × 32 BITS GDDR SDRAM
Table of Contents-
1. GENERAL DESCRIPTION .................................................................................................................................4
2. FEATURES ........................................................................................................................................................4
3. KEY PARAMETERS...........................................................................................................................................5
4. BALL CONFIGURATION....................................................................................................................................6
5. BALL DESCRIPTION .........................................................................................................................................7
6. BLOCK DIAGRAM..............................................................................................................................................9
7. FUNCTIONAL DESCRIPTION .........................................................................................................................10
7.1 Power Up Sequence...........................................................................................................................10
7.2 Command Function ............................................................................................................................11
7.2.1 Bank Activate Command ......................................................................................................11
7.2.2 Bank Precharge Command ..................................................................................................11
7.2.3 Precharge All Command ......................................................................................................11
7.2.4 Write Command ...................................................................................................................11
7.2.5 Write with Auto-precharge Command ..................................................................................11
7.2.6 Read Command ...................................................................................................................11
7.2.7 Read with Auto-precharge Command ..................................................................................11
7.2.8 Mode Register Set Command ..............................................................................................12
7.2.9 Extended Mode Register Set Command ..............................................................................12
7.2.10 No-Operation Command ......................................................................................................12
7.2.11 Burst Read Stop Command..................................................................................................12
7.2.12 Device Deselect Command ..................................................................................................12
7.2.13 Auto Refresh Command .......................................................................................................12
7.2.14 Self Refresh Entry Command...............................................................................................13
7.2.15 Self Refresh Exit Command .................................................................................................13
7.2.16 Data Write Enable /Disable Command .................................................................................13
7.3 Read Operation ..................................................................................................................................13
7.4 Write Operation ..................................................................................................................................14
7.5 Precharge...........................................................................................................................................14
7.6 Burst Termination ...............................................................................................................................14
7.7 Refresh Operation ..............................................................................................................................14
7.8 Power Down Mode .............................................................................................................................15
7.9 Input Clock Frequency Change during Precharge Power Down Mode...............................................15
7.10 Mode Register Operation ...................................................................................................................15
7.10.1 Burst Length field (A2 to A0) ................................................................................................16
7.10.2 Addressing Mode Select (A3)...............................................................................................16
Publication Release Date: Aug. 30, 2010
- 1 - Revision A06
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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W9412G2IB
3. KEY PARAMETERS
SYMBOL
DESCRIPTION
CL = 2
tCK Clock Cycle Time
CL = 2.5
CL = 3
tRAS
tRC
IDD0
IDD1
IDD4R
IDD4W
IDD5
IDD6
CL = 4
Active to Precharge Command Period
Active to Ref/Active Command Period
Operating Current:
One Bank Active-Precharge
Operating Current:
One Bank Active-Read-Precharge
Burst Operation Read Current
Burst Operation Write Current
Auto Refresh Current
Self-Refresh Current
MIN./MAX.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Max.
-4
-
-
-
-
4 nS
12 nS
4 nS
12 nS
40 nS
48 nS
160 mA
-5/-5I
7.5 nS
12 nS
6 nS
12 nS
5 nS
12 nS
-
-
40 nS
50 nS
150 mA
-6/-6I
7.5 nS
12 nS
6 nS
12 nS
6 nS
12 nS
-
-
42 nS
54 nS
140 mA
Max.
Max.
Max.
Max.
Max.
180 mA
240 mA
270 mA
210 mA
3 mA
170 mA
220 mA
250 mA
200 mA
3 mA
160 mA
200 mA
230 mA
190 mA
3 mA
-5-
Publication Release Date: Aug. 30, 2010
Revision A06
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
W9412G2IB
7.2 Command Function
7.2.1 Bank Activate Command
( RAS = “L”, CAS = “H”, WE = “H”, BA0, BA1 = Bank, A0 to A11 = Row Address)
The Bank Activate command activates the bank designated by the BA (Bank address) signal. Row
addresses are latched on A0 to A11 when this command is issued and the cell data is read out of
the sense amplifiers. The maximum time that each bank can be held in the active state is specified
as tRAS (max). After this command is issued, Read or Write operation can be executed.
7.2.2 Bank Precharge Command
( RAS = “L”, CAS = “H”, WE = “L”, BA0, BA1 = Bank, A8 = “L”, A0 to A7, A9 to A11 = Don’t
Care)
The Bank Precharge command percharges the bank designated by BA. The precharged bank is
switched from the active state to the idle state.
7.2.3 Precharge All Command
( RAS = “L”, CAS = “H”, WE = “L”, BA0, BA1 = Don’t Care, A8 = “H”, A0 to A7, A9 to A11 =
Don’t Care)
The Precharge All command precharges all banks simultaneously. Then all banks are switched to
the idle state.
7.2.4 Write Command
( RAS = “H”, CAS = “L”, WE = “L”, BA0, BA1 = Bank, A8 = “L”, A0 to A7 = Column Address)
The write command performs a Write operation to the bank designated by BA. The write data are
latched at both edges of DQS. The length of the write data (Burst Length) and column access
sequence (Addressing Mode) must be in the Mode Register at power-up prior to the Write
operation.
7.2.5 Write with Auto-precharge Command
( RAS = “H”, CAS = “L”, WE = “L”, BA0, BA1 = Bank, A8 = “H”, A0 to A7 = Column Address)
The Write with Auto-precharge command performs the Precharge operation automatically after the
Write operation. This command must not be interrupted by any other commands.
7.2.6 Read Command
( RAS = “H”, CAS = “L”, WE = “H”, BA0, BA1 = Bank, A8 = “L”, A0 to A7 = Column Address)
The Read command performs a Read operation to the bank designated by BA. The read data are
synchronized with both edges of DQS. The length of read data (Burst Length), Addressing Mode
and CAS Latency (access time from CAS command in a clock cycle) must be programmed in the
Mode Register at power-up prior to the Read operation.
7.2.7 Read with Auto-precharge Command
( RAS = “H”, CAS = ”L”, WE = ”H”, BA0, BA1 = Bank, A8 = ”H”, A0 to A7 = Column Address)
The Read with Auto-precharge command automatically performs the Precharge operation after the
Read operation.
- 11 -
Publication Release Date: Aug. 30, 2010
Revision A06
Datasheet pdf - http://www.DataSheet4U.net/
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