W9425G8EH
8M × 4 BANKS × 8 BITS DDR SDRAM
Table of Contents1.
GENERAL DESCRIPTION .............................................................................................................. 4
2.
FEATURES...................................................................................................................................... 4
3.
KEY PARAMETERS........................................................................................................................ 5
4.
PIN CONFIGURATION.................................................................................................................... 6
5.
PIN DESCRIPTION ......................................................................................................................... 7
6.
BLOCK DIAGRAM........................................................................................................................... 8
7.
FUNCTIONAL DESCRIPTION ........................................................................................................ 9
7.1
Power Up Sequence.............................................................................................................. 9
7.2
Command Function ............................................................................................................. 10
7.2.1
Bank Activate Command ......................................................................................................10
7.2.2
Bank Precharge Command ..................................................................................................10
7.2.3
Precharge All Command ......................................................................................................10
7.2.4
Write Command ...................................................................................................................10
7.2.5
Write with Auto-precharge Command ..................................................................................10
7.2.6
Read Command ...................................................................................................................10
7.2.7
Read with Auto-precharge Command ..................................................................................10
7.2.8
Mode Register Set Command ..............................................................................................11
7.2.9
Extended Mode Register Set Command ..............................................................................11
7.2.10
No-Operation Command ......................................................................................................11
7.2.11
Burst Read Stop Command..................................................................................................11
7.2.12
Device Deselect Command ..................................................................................................11
7.2.13
Auto Refresh Command .......................................................................................................11
7.2.14
Self Refresh Entry Command...............................................................................................12
7.2.15
Self Refresh Exit Command .................................................................................................12
7.2.16
Data Write Enable /Disable Command .................................................................................12
7.3
Read Operation ................................................................................................................... 12
7.4
Write Operation ................................................................................................................... 13
7.5
Precharge ............................................................................................................................ 13
7.6
Burst Termination ................................................................................................................ 13
7.7
Refresh Operation ............................................................................................................... 13
7.8
Power Down Mode .............................................................................................................. 14
7.9
Input Clock Frequency Change during Precharge Power Down Mode .............................. 14
7.10 Mode Register Operation .................................................................................................... 14
7.10.1
Burst Length field (A2 to A0) ................................................................................................14
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8.
9.
7.10.2
Addressing Mode Select (A3)...............................................................................................15
7.10.3
CAS Latency field (A6 to A4)................................................................................................16
7.10.4
DLL Reset bit (A8) ................................................................................................................16
7.10.5
Mode Register /Extended Mode register change bits (BS0, BS1) ........................................16
7.10.6
Extended Mode Register field ..............................................................................................16
7.10.7
Reserved field ......................................................................................................................16
OPERATION MODE...................................................................................................................... 17
8.1
Simplified Truth Table.......................................................................................................... 17
8.2
Function Truth Table ........................................................................................................... 18
8.3
Function Truth Table for CKE.............................................................................................. 21
8.4
Simplified Stated Diagram................................................................................................... 22
ELECTRICAL CHARACTERISTICS ............................................................................................. 23
9.1
Absolute Maximum Ratings................................................................................................. 23
9.2
Recommended DC Operating Conditions ........................................................................... 23
9.3
Capacitance......................................................................................................................... 24
9.4
Leakage and Output Buffer Characteristics ........................................................................ 24
9.5
DC Characteristics............................................................................................................... 25
9.6
AC Characteristics and Operating Condition....................................................................... 26
9.7
AC Test Conditions.............................................................................................................. 27
10. SYSTEM CHARACTERISTICS FOR DDR SDRAM ..................................................................... 30
10.1 Table 1: Input Slew Rate for DQ, DQS, and DM................................................................. 30
10.2 Table 2: Input Setup & Hold Time Derating for Slew Rate.................................................. 30
10.3 Table 3: Input/Output Setup & Hold Time Derating for Slew Rate...................................... 30
10.4 Table 4: Input/Output Setup & Hold Derating for Rise/Fall Delta Slew Rate ...................... 30
10.5 Table 5: Output Slew Rate Characteristics (X8 Devices only) ............................................ 30
10.6 Table 6: Output Slew Rate Matching Ratio Characteristics ................................................ 31
10.7 Table 7: AC Overshoot/Undershoot Specification for Address and Control Pins ............... 31
10.8 Table 8: Overshoot/Undershoot Specification for Data, Strobe, and Mask Pins ................ 32
10.9 System Notes: ..................................................................................................................... 33
11. TIMING WAVEFORMS.................................................................................................................. 35
11.1 Command Input Timing ....................................................................................................... 35
11.2 Timing of the CLK Signals................................................................................................... 35
11.3 Read Timing (Burst Length = 4) .......................................................................................... 36
11.4 Write Timing (Burst Length = 4) .......................................................................................... 37
11.5 DM, DATA MASK (W9425G8EH) ....................................................................................... 38
11.6 Mode Register Set (MRS) Timing ....................................................................................... 39
11.7 Extend Mode Register Set (EMRS) Timing......................................................................... 40
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11.8 Auto-precharge Timing (Read Cycle, CL = 2) ..................................................................... 41
11.9 Auto-precharge Timing (Read cycle, CL = 2), continued .................................................... 42
11.10 Auto-precharge Timing (Write Cycle) .................................................................................. 43
11.11 Read Interrupted by Read (CL = 2, BL = 2, 4, 8) ................................................................ 44
11.12 Burst Read Stop (BL = 8) .................................................................................................... 44
11.13 Read Interrupted by Write & BST (BL = 8).......................................................................... 45
11.14 Read Interrupted by Precharge (BL = 8) ............................................................................. 45
11.15 Write Interrupted by Write (BL = 2, 4, 8) ............................................................................. 46
11.16 Write Interrupted by Read (CL = 2, BL = 8)......................................................................... 46
11.17 Write Interrupted by Read (CL = 3, BL = 4)......................................................................... 47
11.18 Write Interrupted by Precharge (BL = 8) ............................................................................. 47
11.19 2 Bank Interleave Read Operation (CL = 2, BL = 2) ........................................................... 48
11.20 2 Bank Interleave Read Operation (CL = 2, BL = 4) ........................................................... 48
11.21 4 Bank Interleave Read Operation (CL = 2, BL = 2) ........................................................... 49
11.22 4 Bank Interleave Read Operation (CL = 2, BL = 4) ........................................................... 49
11.23 Auto Refresh Cycle.............................................................................................................. 50
11.24 Precharge/Activate Power Down Mode Entry and Exit Timing ........................................... 50
11.25 Input Clock Frequency Change during Precharge Power Down Mode Timing................... 50
11.26 Self Refresh Entry and Exit Timing ..................................................................................... 51
12. PACKAGE SPECIFICATION......................................................................................................... 52
12.1 TSOP 66 lI – 400 mil ........................................................................................................... 52
13. REVISION HISTORY..................................................................................................................... 53
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W9425G8EH
1. GENERAL DESCRIPTION
W9425G8EH is a CMOS Double Data Rate synchronous dynamic random access memory (DDR
SDRAM), organized as 8,388,608 words × 4 banks × 8 bits. W9425G8EH delivers a data bandwidth of
up to 400M words per second (-5). To fully comply with the personal computer industrial standard,
W9425G8EH is sorted into three speed grades: -5, -6 and -75. The -5 is compliant to the DDR400/CL3
specification, the -6 is compliant to the DDR333/CL2.5 specification and the -75 is compliant to the
DDR266/CL2 specification.
All Input reference to the positive edge of CLK (except for DQ, DM and CKE). The timing reference
point for the differential clock is when the CLK and CLK signals cross during a transition. Write and
Read data are synchronized with the both edges of DQS (Data Strobe).
By having a programmable Mode Register, the system can change burst length, latency cycle,
interleave or sequential burst to maximize its performance. W9425G8EH is ideal for main memory in
high performance applications.
2. FEATURES
•
2.5V ±0.2V Power Supply for DDR266/DDR333/DDR400
•
Up to 200 MHz Clock Frequency
•
Double Data Rate architecture; two data transfers per clock cycle
•
Differential clock inputs (CLK and CLK )
•
DQS is edge-aligned with data for Read; center-aligned with data for Write
•
CAS Latency: 2, 2.5 and 3
•
Burst Length: 2, 4 and 8
•
Auto Refresh and Self Refresh
•
Precharged Power Down and Active Power Down
•
Write Data Mask
•
Write Latency = 1
•
7.8µS refresh interval (8K/64mS refresh)
•
Maximum burst refresh cycle: 8
•
Interface: SSTL_2
•
Packaged in TSOP II 66-pin, using Lead free materials with RoHS compliant
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
3. KEY PARAMETERS
SYMBOL
DESCRIPTION
MIN./MAX.
CL = 2
tCK
Clock Cycle Time
CL = 2.5
CL = 3
-5
-6
-75
Min.
7.5 nS
7.5 nS
7.5 nS
Max.
12 nS
12 nS
12 nS
Min.
6 nS
6 nS
7.5 nS
Max.
12 nS
12 nS
12 nS
Min.
5 nS
6 nS
7.5 nS
Max.
12 nS
12 nS
12 nS
tRAS
Active to Precharge Command Period
Min.
40 nS
42 nS
45 nS
tRC
Active to Ref/Active Command Period
Min.
55 nS
60 nS
67.5 nS
Max.
110 mA
110 mA
110 mA
Max.
150 mA
150 mA
150 mA
IDD0
IDD1
Operating Current:
One Bank Active-Precharge
Operating Current:
One Bank Active-Read-Precharge
IDD4R
Burst Operation Read Current
Max.
180 mA
170 mA
160 mA
IDD4W
Burst Operation Write Current
Max.
180 mA
170 mA
160 mA
IDD5
Auto Refresh Current
Max.
190 mA
190 mA
190 mA
IDD6
Self Refresh Current
Max.
3 mA
3 mA
3 mA
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
4. PIN CONFIGURATION
VDD
1
66
VSS
DQ0
2
65
DQ7
VDDQ
3
64
VSSQ
NC
4
63
NC
DQ1
5
62
DQ6
VSSQ
6
61
VDDQ
NC
DQ5
NC
7
60
DQ2
8
59
VDDQ
9
58
VSSQ
NC
10
57
NC
DQ4
DQ3
11
56
VSSQ
12
55
VDDQ
NC
13
54
NC
NC
14
53
NC
VDDQ
15
52
VSSQ
NC
16
51
DQS
NC
NC
17
50
VDD
18
49
VREF
NC
19
48
VSS
DM
NC
20
47
WE
21
46
CLK
CAS
22
45
CLK
RAS
23
44
CKE
CS
24
43
NC
NC
25
42
A12
BS0
26
41
A11
BS1
27
40
A9
A10/AP
28
39
A8
A0
29
38
A7
A1
30
37
A6
A2
31
36
A5
A3
32
35
A4
VDD
33
34
VSS
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
5. PIN DESCRIPTION
PIN NUMBER
PIN NAME
FUNCTION
DESCRIPTION
Multiplexed pins for row and column address.
28 − 32,
35 − 42
A0 − A12
26, 27
BS0, BS1
Bank Select
Select bank to activate during row address latch time, or bank
to read/write during column address latch time.
2, 5, 8, 11, 56,
59, 62, 65
DQ0 − DQ7
Data Input/
Output
The DQ0 – DQ7 input and output data are synchronized with
both edges of DQS.
51
DQS
Data Strobe
DQS is Bi-directional signal. DQS is input signal during write
operation and output signal during read operation. It is Edgealigned with read data, Center-aligned with write data.
24
CS
Chip Select
Disable or enable the command decoder. When command
decoder is disabled, new command is ignored and previous
operation continues.
RAS , CAS ,
WE
Command
Inputs
Command inputs (along with CS ) define the command being
entered.
47
DM
Write Mask
When DM is asserted "high" in burst write, the input data is
masked. DM is synchronized with both edges of DQS.
45, 46
CLK, CLK
Differential
Clock Inputs
All address and control input signals are sampled on the
crossing of the positive edge of CLK and negative edge of
CLK .
44
CKE
49
VREF
Reference
Voltage
1, 18, 33
VDD
Power (+2.5)
Power for logic circuit inside DDR SDRAM.
34, 48, 66
VSS
Ground
Ground for logic circuit inside DDR SDRAM.
3, 9, 15, 55, 61
VDDQ
Power (+2.5V) Separated power from VDD, used for output buffer, to improve
for I/O Buffer noise.
6, 12, 52, 58, 64
VSSQ
Ground for I/O Separated ground from VSS, used for output buffer, to improve
noise.
Buffer
4, 7, 10, 13, 14,
16, 17, 19, 20,
25, 43, 50, 53,
54, 57, 60, 63
NC
23, 22, 21
Address
Row address: A0 − A12.
Column address: A0 − A9. (A10 is used for Auto-precharge)
CKE controls the clock activation and deactivation. When CKE
Clock Enable is low, Power Down mode, Suspend mode, or Self Refresh
mode is entered.
No Connection
VREF is reference voltage for inputs.
No connection. (NC pin should be connected to GND or
floating)
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
6. BLOCK DIAGRAM
CLK
CLK
DLL
CLOCK
BUFFER
CKE
CONTROL
CS
RAS
CAS
SIGNAL
GENERATOR
COMMAND
DECODER
COLUMN DECODER
COLUMN DECODER
A10
MODE
REGISTER
A0
CELL ARRAY
BANK #1
SENSE AMPLIFIER
SENSE AMPLIFIER
ADDRESS
BUFFER
PREFETCH REGISTER
DQ
DATA CONTROL
BUFFER
DQ0
DQ7
CIRCUIT
COLUMN
COUNTER
COUNTER
DQS
DM
COLUMN DECODER
CELL ARRAY
BANK #2
COLUMN DECODER
ROW DECODER
REFRESH
ROW DECODER
A9
A11
A12
BS0
BS1
CELL ARRAY
BANK #0
ROW DECODER
ROW DECODER
WE
SENSE AMPLIFIER
CELL ARRAY
BANK #3
SENSE AMPLIFIER
NOTE: The cell array configuration is 8192 * 1024 * 8
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
7. FUNCTIONAL DESCRIPTION
7.1
Power Up Sequence
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Apply power and attempt to CKE at a low state ( ≤ 0.2V), all other inputs may be undefined
1) Apply VDD before or at the same time as VDDQ.
2) Apply VDDQ before or at the same time as VTT and VREF.
Start Clock and maintain stable condition for 200 µS (min.).
After stable power and clock, apply NOP and take CKE high.
Issue precharge command for all banks of the device.
Issue EMRS (Extended Mode Register Set) to enable DLL and establish Output Driver Type.
Issue MRS (Mode Register Set) to reset DLL and set device to idle with bit A8.
(An additional 200 cycles(min) of clock are required for DLL Lock before any executable
command applied.)
Issue precharge command for all banks of the device.
Issue two or more Auto Refresh commands.
Issue MRS-Initialize device operation with the reset DLL bit deactivated A8 to low.
CLK
CLK
Command
PREA
EMRS
tRP
MRS
2 Clock min.
PREA
2 Clock min.
AREF
tRP
AREF
tRFC
ANY
CMD
MRS
tRFC
2 Clock min.
200 Clock min.
Inputs
maintain stable
for 200 µS min.
Enable DLL
Disable DLL reset with A8 = Low
DLL reset with A8 = High
Initialization sequence after power-up
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Publication Release Date: Jul. 04, 2008
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7.2
Command Function
7.2.1
Bank Activate Command
( RAS = "L", CAS = "H", WE = "H", BS0, BS1 = Bank, A0 to A12 = Row Address)
The Bank Activate command activates the bank designated by the BS (Bank address) signal. Row
addresses are latched on A0 to A12 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", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11, A12 = Don’t
Care)
The Bank Precharge command percharges the bank designated by BS. 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", BS0, BS1 = Don’t Care, A10 = "H", A0 to A9, A11, A12 =
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", BS0, BS1 = Bank, A10 = "L", A0 to A9 = Column Address)
The write command performs a Write operation to the bank designated by BS. 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", BS0, BS1 = Bank, A10 = "H", A0 to A9 = 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", BS0, BS1 = Bank, A10 = "L", A0 to A9 = Column Address)
The Read command performs a Read operation to the bank designated by BS. 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”, BS0, BS1 = Bank, A10 = ”H”, A0 to A9 = Column Address)
The Read with Auto-precharge command automatically performs the Precharge operation after the
Read operation.
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Publication Release Date: Jul. 04, 2008
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W9425G8EH
1) READA ≥ tRAS (min) - (BL/2) x tCK
Internal precharge operation begins after BL/2 cycle from Read with Auto-precharge command.
2) tRCD(min) ≤ READA < tRAS(min) - (BL/2) x tCK
Data can be read with shortest latency, but the internal Precharge operation does not begin until
after tRAS (min) has completed.
This command must not be interrupted by any other command.
7.2.8
Mode Register Set Command
( RAS = "L", CAS = "L", WE = "L", BS0 = "L", BS1 = "L", A0 to A12 = Register Data)
The Mode Register Set command programs the values of CAS Latency, Addressing Mode, Burst
Length and DLL reset in the Mode Register. The default values in the Mode Register after powerup are undefined, therefore this command must be issued during the power-up sequence. Also,
this command can be issued while all banks are in the idle state. Refer to the table for specific
codes.
7.2.9
Extended Mode Register Set Command
( RAS = "L", CAS = "L", WE = "L", BS0 = "H", BS1 = "L", A0 to A12 = Register data)
The Extended Mode Register Set command can be implemented as needed for function
extensions to the standard (SDR-SDRAM). These additional functions include DLL enable/disable,
output drive strength selection. The default value of the extended mode register is not defined;
therefore this command must be issued during the power-up sequence for enabling DLL. Refer to
the table for specific codes.
7.2.10 No-Operation Command
( RAS = "H", CAS = "H", WE = "H")
The No-Operation command simply performs no operation (same command as Device Deselect).
7.2.11 Burst Read Stop Command
( RAS = "H", CAS = "H", WE = "L")
The Burst stop command is used to stop the burst operation. This command is only valid during a
Burst Read operation.
7.2.12 Device Deselect Command
( CS = "H")
The Device Deselect command disables the command decoder so that the RAS , CAS ,
WE and Address inputs are ignored. This command is similar to the No-Operation command.
7.2.13 Auto Refresh Command
( RAS = "L", CAS = "L", WE = "H", CKE = "H", BS0, BS1, A0 to A12 = Don’t Care)
AUTO REFRESH is used during normal operation of the DDR SDRAM and is analogous to CAS–
BEFORE–RAS (CBR) refresh in previous DRAM types. This command is non persistent, so it
must be issued each time a refresh is required. The refresh addressing is generated by the
internal refresh controller. This makes the address bits ”Don’t Care” during an AUTO REFRESH
command. The DDR SDRAM requires AUTO REFRESH cycles at an average periodic interval of
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tREFI (maximum). To allow for improved efficiency in scheduling and switching between tasks,
some flexibility in the absolute refresh interval is provided. A maximum of eight AUTO REFRESH
commands can be posted to any given DDR SDRAM, and the maximum absolute interval
between any AUTO REFRESH command and the next AUTO REFRESH command is 8 * tREFI.
7.2.14 Self Refresh Entry Command
( RAS = "L", CAS = "L", WE = "H", CKE = "L", BS0, BS1, A0 to A12 = Don’t Care)
The SELF REFRESH command can be used to retain data in the DDR SDRAM, even if the rest of
the system is powered down. When in the self refresh mode, the DDR SDRAM retains data
without external clocking. The SELF REFRESH command is initiated like an AUTO REFRESH
command except CKE is disabled (LOW). The DLL is automatically disabled upon entering SELF
REFRESH, and is automatically enabled upon exiting SELF REFRESH. Any time the DLL is
enabled a DLL Reset must follow and 200 clock cycles should occur before a READ command
can be issued. Input signals except CKE are “Don’t Care” during SELF REFRESH. Since CKE is
an SSTL_2 input, VREF must be maintained during SELF REFRESH.
7.2.15 Self Refresh Exit Command
(CKE = "H", CS = "H" or CKE = "H", RAS = "H", CAS = "H")
The procedure for exiting self refresh requires a sequence of commands. First, CLK must be
stable prior to CKE going back HIGH. Once CKE is HIGH, the DDR SDRAM must have NOP
commands issued for tXSNR because time is required for the completion of any internal refresh in
progress. A simple algorithm for meeting both refresh and DLL requirements is to apply NOPs for
200 clock cycles before applying any other command.
The use of SELF REFREH mode introduces the possibility that an internally timed event can be
missed when CKE is raised for exit from self refresh mode. Upon exit from SELF REFRESH an
extra auto refresh command is recommended.
7.2.16 Data Write Enable /Disable Command
(DM = "L/H")
During a Write cycle, the DM signal functions as Data Mask and can control every word of the
input data. The DM signal controls DQ0 to DQ7.
7.3
Read Operation
Issuing the Bank Activate command to the idle bank puts it into the active state. When the Read
command is issued after tRCD from the Bank Activate command, the data is read out sequentially,
synchronized with both edges of DQS (Burst Read operation). The initial read data becomes
available after CAS Latency from the issuing of the Read command. The CAS Latency must be set
in the Mode Register at power-up.
When the Precharge Operation is performed on a bank during a Burst Read and operation, the
Burst operation is terminated.
When the Read with Auto-precharge command is issued, the Precharge operation is performed
automatically after the Read cycle, then the bank is switched to the idle state. This command
cannot be interrupted by any other commands. Refer to the diagrams for Read operation.
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W9425G8EH
7.4
Write Operation
Issuing the Write command after tRCD from the bank activate command. The input data is latched
sequentially, synchronizing with both edges(rising & falling) of DQS after the Write command
(Burst write operation). The burst length of the Write data (Burst Length) and Addressing Mode
must be set in the Mode Register at power-up.
When the Precharge operation is performed in a bank during a Burst Write operation, the Burst
operation is terminated.
When the Write with Auto-precharge command is issued, the Precharge operation is performed
automatically after the Write cycle, then the bank is switched to the idle state, The Write with Autoprecharge command cannot be interrupted by any other command for the entire burst data
duration.
Refer to the diagrams for Write operation.
7.5
Precharge
There are two Commands, which perform the precharge operation (Bank Precharge and
Precharge All). When the Bank Precharge command is issued to the active bank, the bank is
precharged and then switched to the idle state. The Bank Precharge command can precharge one
bank independently of the other bank and hold the unprecharged bank in the active state. The
maximum time each bank can be held in the active state is specified as tRAS (max). Therefore, each
bank must be precharged within tRAS(max) from the bank activate command.
The Precharge All command can be used to precharge all banks simultaneously. Even if banks
are not in the active state, the Precharge All command can still be issued. In this case, the
Precharge operation is performed only for the active bank and the precharge bank is then
switched to the idle state.
7.6
Burst Termination
When the Precharge command is used for a bank in a Burst cycle, the Burst operation is
terminated. When Burst Read cycle is interrupted by the Precharge command, read operation is
disabled after clock cycle of (CAS Latency) from the Precharge command. When the Burst Write
cycle is interrupted by the Precharge command, the input circuit is reset at the same clock cycle at
which the precharge command is issued. In this case, the DM signal must be asserted "high"
during tWR to prevent writing the invalided data to the cell array.
When the Burst Read Stop command is issued for the bank in a Burst Read cycle, the Burst Read
operation is terminated. The Burst read Stop command is not supported during a write burst
operation. Refer to the diagrams for Burst termination.
7.7
Refresh Operation
Two types of Refresh operation can be performed on the device: Auto Refresh and Self Refresh.
By repeating the Auto Refresh cycle, each bank in turn refreshed automatically. The Refresh
operation must be performed 8192 times (rows) within 64mS. The period between the Auto
Refresh command and the next command is specified by tRFC.
Self Refresh mode enters issuing the Self Refresh command (CKE asserted "low") while all banks
are in the idle state. The device is in Self Refresh mode for as long as CKE held "low". In the case
of distributed Auto Refresh commands, distributed auto refresh commands must be issued every
7.8 µS and the last distributed Auto Refresh commands must be performed within 7.8 µS before
entering the self refresh mode. After exiting from the Self Refresh mode, the refresh operation
must be performed within 7.8 µS. In Self Refresh mode, all input/output buffers are disabled,
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Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
resulting in lower power dissipation (except CKE buffer). Refer to the diagrams for Refresh
operation.
7.8
Power Down Mode
Two types of Power Down Mode can be performed on the device: Active Standby Power Down
Mode and Precharge Standby Power Down Mode.
When the device enters the Power Down Mode, all input/output buffers and DLL are disabled
resulting in low power dissipation (except CKE buffer).
Power Down Mode enter asserting CKE "low" while the device is not running a burst cycle. Taking
CKE "high" can exit this mode. When CKE goes high, a No operation command must be input at
next CLK rising edge. Refer to the diagrams for Power Down Mode.
7.9
Input Clock Frequency Change during Precharge Power Down Mode
DDR SDRAM input clock frequency can be changed under following condition:
DDR SDRAM must be in precharged power down mode with CKE at logic LOW level. After a
minimum of 2 clocks after CKE goes LOW, the clock frequency may change to any frequency
between minimum and maximum operating frequency specified for the particular speed grade.
During an input clock frequency change, CKE must be held LOW. Once the input clock frequency
is changed, a stable clock must be provided to DRAM before precharge power down mode may be
exited. The DLL must be RESET via EMRS after precharge power down exit. An additional MRS
command may need to be issued to appropriately set CL etc. After the DLL relock time, the DRAM
is ready to operate with new clock frequency.
7.10 Mode Register Operation
The mode register is programmed by the Mode Register Set command (MRS/EMRS) when all
banks are in the idle state. The data to be set in the Mode Register is transferred using the A0 to
A12 and BS0, BS1 address inputs.
The Mode Register designates the operation mode for the read or write cycle. The register is
divided into five filed: (1) Burst Length field to set the length of burst data (2) Addressing Mode
selected bit to designate the column access sequence in a Burst cycle (3) CAS Latency field to set
the assess time in clock cycle (4) DLL reset field to reset the DLL (5) Regular/Extended Mode
Register filed to select a type of MRS (Regular/Extended MRS). EMRS cycle can be implemented
the extended function (DLL enable/Disable mode).
The initial value of the Mode Register (including EMRS) after power up is undefined; therefore the
Mode Register Set command must be issued before power operation.
7.10.1 Burst Length field (A2 to A0)
This field specifies the data length for column access using the A2 to A0 pins and sets the Burst
Length to be 2, 4 and 8 words.
A2
A1
A0
BURST LENGTH
0
0
0
Reserved
0
0
1
2 words
0
1
0
4 words
0
1
1
8 words
1
x
x
Reserved
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Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
7.10.2 Addressing Mode Select (A3)
The Addressing Mode can be one of two modes; Interleave mode or Sequential Mode, When the
A3 bit is "0", Sequential mode is selected. When the A3 bit is "1", Interleave mode is selected. Both
addressing Mode support burst length 2, 4 and 8 words.
A3
ADDRESSING MODE
0
Sequential
1
Interleave
7.10.2.1. Addressing Sequence of Sequential Mode
A column access is performed by incrementing the column address input to the device. The
address is varied by the Burst Length as the following.
Addressing Sequence of Sequential Mode
DATA
ACCESS ADDRESS
BURST LENGTH
Data 0
n
2 words (address bits is A0)
Data 1
n+1
not carried from A0 to A1
Data 2
n+2
4 words (address bit A0, A1)
Data 3
n+3
Not carried from A1 to A2
Data 4
n+4
Data 5
n+5
8 words (address bits A2, A1 and A0)
Data 6
n+6
Not carried from A2 to A3
Data 7
n+7
7.10.2.2. Addressing Sequence for Interleave Mode
A Column access is started from the inputted column address and is performed by interleaving the
address bits in the sequence shown as the following.
Address Sequence for Interleave Mode
DATA
ACCESS ADDRESS
Data 0
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 1
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 2
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 3
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 4
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 5
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 6
A8 A7 A6 A5 A4 A3 A2 A1 A0
Data 7
A8 A7 A6 A5 A4 A3 A2 A1 A0
- 15 -
BURST LENGTH
2 words
4 words
8 words
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
7.10.3 CAS Latency field (A6 to A4)
This field specifies the number of clock cycles from the assertion of the Read command to the first
data read. The minimum values of CAS Latency depend on the frequency of CLK.
A6
A5
A4
CAS LATENCY
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Reserved
Reserved
2
3
Reserved
Reserved
2.5
Reserved
7.10.4 DLL Reset bit (A8)
This bit is used to reset DLL. When the A8 bit is "1", DLL is reset.
7.10.5 Mode Register /Extended Mode register change bits (BS0, BS1)
These bits are used to select MRS/EMRS.
BS1
BS0
A12-A0
0
0
1
0
1
x
Regular MRS Cycle
Extended MRS Cycle
Reserved
7.10.6 Extended Mode Register field
1) DLL Switch field (A0)
This bit is used to select DLL enable or disable
A0
DLL
0
1
Enable
Disable
2) Output Driver Size Control field (A1)
This bit is used to select Output Driver Size, both Full strength and Half strength are based on
JEDEC standard.
A1
OUTPUT DRIVER
0
1
Full Strength
Half Strength
7.10.7 Reserved field
• Test mode entry bit (A7)
This bit is used to enter Test mode and must be set to "0" for normal operation.
• Reserved bits (A9, A10, A11, A12)
These bits are reserved for future operations. They must be set to "0" for normal operation.
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Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
8. OPERATION MODE
The following table shows the operation commands.
8.1
Simplified Truth Table
SYM.
COMMAND
ACT
DEVICE
STATE
(3)
Bank Active
Idle
(3)
PRE
Bank Precharge
PREA
Precharge All
Any
WRIT
Write
Active
WRITA
Write with Autoprecharge
Active
CKEn-1
CKEn
DM
H
X
X
(4)
BS0,
BS1
A10
A12,
A11,
A9-A0
CS
RAS
CAS
V
V
V
L
L
H
WE
H
H
X
X
V
L
X
L
L
H
L
H
X
X
X
H
X
L
L
H
L
(3)
H
X
X
V
L
V
L
H
L
L
(3)
H
X
X
V
H
V
L
H
L
L
(3)
H
X
X
V
L
V
L
H
L
H
(3)
Any
READ
Read
Active
READA
Read with Autoprecharge
Active
H
X
X
V
H
V
L
H
L
H
MRS
Mode Register Set
Idle
H
X
X
L, L
C
C
L
L
L
L
EMRS
Extended Mode
Register Set
Idle
H
X
X
H, L
V
V
L
L
L
L
NOP
No Operation
Any
H
X
X
X
X
X
L
H
H
H
BST
Burst Read Stop
Active
H
X
X
X
X
X
L
H
H
L
DSL
Device Deselect
Any
H
X
X
X
X
X
H
X
X
X
AREF
Auto Refresh
Idle
H
H
X
X
X
X
L
L
L
H
SELF
Self Refresh Entry
Idle
H
L
X
X
X
X
L
L
L
H
SELEX
Self Refresh Exit
Idle
(Self
Refresh)
L
H
X
X
X
X
H
X
X
X
L
H
H
X
PD
Power Down
Mode Entry
Idle/
(5)
Active
H
L
X
X
X
X
H
X
X
X
PDEX
Power Down
Mode Exit
Any
(Power
Down)
L
H
X
X
X
X
WDE
Data Write
Enable
Active
H
X
L
X
X
WDD
Data Write Disable
Active
H
X
H
X
X
L
H
H
X
H
X
X
X
L
H
H
X
X
X
X
X
X
X
X
X
X
X
Notes:
1. V = Valid
X = Don’t Care
L = Low level
H = High level
2. CKEn signal is input level when commands are issued.
CKEn-1 signal is input level one clock cycle before the commands are issued.
3. These are state designated by the BS0, BS1 signals.
4. LDM, UDM (W9425G8EH).
5. Power Down Mode can not entry in the burst cycle.
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Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
8.2
Function Truth Table
(Note 1)
CURRENT
STATE
Idle
Row Active
Read
Write
ADDRESS
COMMAND
ACTION
NOTES
CS RAS
CAS
WE
H
X
X
X
X
DSL
NOP
L
H
H
X
X
NOP/BST
NOP
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
Row activating
L
L
H
L
BS, A10
PRE/PREA
NOP
L
L
L
H
X
AREF/SELF
Refresh or Self refresh
2
L
L
L
L
Op-Code
MRS/EMRS
Mode register accessing
2
H
X
X
X
X
DSL
NOP
L
H
H
X
X
NOP/BST
NOP
L
H
L
H
BS, CA, A10
READ/READA
Begin read: Determine AP
4
L
H
L
L
BS, CA, A10
WRIT/WRITA
Begin write: Determine AP
4
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
Precharge
5
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Continue burst to end
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
Burst stop
L
H
L
H
BS, CA, A10
READ/READA
Term burst, new read: Determine AP
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
L
L
H
H
BS, RA
ACT
ILLEGAL
L
L
H
L
BS, A10
PRE/PREA
Term burst, precharging
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Continue burst to end
6
3
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
Term burst, start read: Determine AP
6, 7
L
H
L
L
BS, CA, A10
WRIT/WRITA
Term burst, start read: Determine AP
6
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
Term burst, precharging
8
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
- 18 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
Function Truth Table, continued
CURRENT
STATE
CS
H
Read with
Autoprecharge
Write with
Autoprecharge
Precharging
Row
Activating
RAS
X
CAS
WE
X
X
ADDRESS
X
COMMAND
DSL
ACTION
NOTES
Continue burst to end
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Continue burst to end
L
H
H
H
X
NOP
Continue burst to end
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
NOP-> Idle after tRP
L
H
H
H
X
NOP
NOP-> Idle after tRP
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
3
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
Idle after tRP
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
NOP-> Row active after tRCD
L
H
H
H
X
NOP
NOP-> Row active after tRCD
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
- 19 -
3
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
Function Truth Table, continued
CURRENT
STATE
Write
Recovering
Write
Recovering
with Autoprecharge
Refreshing
Mode
Register
Accessing
CS RAS
CAS
WE
ADDRESS
COMMAND
ACTION
NOTES
H
X
X
X
X
DSL
NOP->Row active after tWR
L
H
H
H
X
NOP
NOP->Row active after tWR
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
3
H
X
X
X
X
DSL
NOP->Enter precharge after tWR
L
H
H
H
X
NOP
NOP->Enter precharge after tWR
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
BS, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
NOP->Idle after tRC
L
H
H
H
X
NOP
NOP->Idle after tRC
L
H
H
L
X
BST
ILLEGAL
L
H
L
H
X
READ/WRIT
ILLEGAL
L
L
H
X
X
ACT/PRE/PREA
ILLEGAL
L
L
L
X
X
AREF/SELF/MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
NOP->Row after tMRD
L
H
H
H
X
NOP
NOP->Row after tMRD
L
H
H
L
X
BST
ILLEGAL
L
H
L
X
X
READ/WRIT
ILLEGAL
L
L
X
X
X
ACT/PRE/PREA/ARE
F/SELF/MRS/EMRS
ILLEGAL
3
Notes:
1. All entries assume that CKE was active (High level) during the preceding clock cycle and the current clock cycle.
2. Illegal if any bank is not idle.
3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BS), depending on the
state of that bank.
4. Illegal if tRCD is not satisfied.
5. Illegal if tRAS is not satisfied.
6. Must satisfy burst interrupt condition.
7. Must avoid bus contention, bus turn around, and/or satisfy write recovery requirements.
8. Must mask preceding data which don’t satisfy tWR.
Remark: H = High level, L = Low level, X = High or Low level (Don’t Care), V = Valid data
- 20 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
8.3
Function Truth Table for CKE
CURRENT
STATE
Self Refresh
Power Down
All banks Idle
Row Active
Any State
Other Than
Listed Above
CKE
WE
ADDRESS
X
X
X
INVALID
X
X
X
X
Exit Self Refresh->Idle after tXSNR
L
H
H
X
X
Exit Self Refresh->Idle after tXSNR
L
H
L
X
X
ILLEGAL
CS RAS CAS
n-1
n
H
X
X
X
L
H
H
L
H
L
H
ACTION
L
H
L
L
X
X
X
ILLEGAL
L
L
X
X
X
X
X
Maintain Self Refresh
H
X
X
X
X
X
X
INVALID
L
H
X
X
X
X
X
Exit Power down->Idle after tIS
NOTES
L
L
X
X
X
X
X
Maintain power down mode
H
H
X
X
X
X
X
Refer to Function Truth Table
H
L
H
X
X
X
X
Enter Power down
H
L
L
H
H
X
X
Enter Power down
2
H
L
L
L
L
H
X
Self Refresh
1
H
L
L
H
L
X
X
ILLEGAL
2
H
L
L
L
X
X
X
ILLEGAL
L
X
X
X
X
X
X
Power down
H
H
X
X
X
X
X
Refer to Function Truth Table
H
L
H
X
X
X
X
Enter Power down
3
H
L
L
H
H
X
X
Enter Power down
3
H
L
L
L
L
H
X
ILLEGAL
H
L
L
H
L
X
X
ILLEGAL
H
L
L
L
X
X
X
ILLEGAL
L
X
X
X
X
X
X
Power down
H
H
X
X
X
X
X
Refer to Function Truth Table
Notes:
1. Self refresh can enter only from the all banks idle state.
2. Power Down occurs when all banks are idle; this mode is referred to as precharge power down.
3. Power Down occurs when there is a row active in any bank; this mode is referred to as active power down.
Remark:
H = High level, L = Low level, X = High or Low level (Don’t Care), V = Valid data
- 21 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
8.4
Simplified Stated Diagram
SELF
REFRESH
SREF
SREFX
MRS/EMRS
MODE
REGISTER
SET
AREF
IDLE
AUTO
REFRESH
PD
PDEX
ACT
POWER
DOWN
ACTIVE
POWERDOWN
PDEX
PD
ROW
ACTIVE
BST
Read
Write
Write
Read
Write
Read
Read
Read A
Write A
Read A
Write A
Read A
PRE
Write A
POWER
APPLIED
POWER
ON
PRE
PRE
PRE
Read A
PRE
CHARGE
Automatic Sequence
Command Sequence
- 22 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
9. ELECTRICAL CHARACTERISTICS
9.1
Absolute Maximum Ratings
PARAMETER
SYMBOL
RATING
UNIT
Input/Output Voltage
VIN, VOUT
-0.3 ~ VDDQ + 0.3
V
Power Supply Voltage
VDD, VDDQ
-0.3 ~ 3.6
V
Operating Temperature
TOPR
0 ~ 70
°C
Storage Temperature
TSTG
-55 ~ 150
°C
TSOLDER
260
°C
PD
1
W
IOUT
50
mA
Soldering Temperature (10s)
Power Dissipation
Short Circuit Output Current
Note: Stresses greater than those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in
the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect reliability.
9.2
Recommended DC Operating Conditions
(TA = 0 to 70°C)
SYMBOL
MIN.
TYP.
MAX.
VDD
Power Supply Voltage
2.3
2.5
2.7
V
2
VDDQ
Power Supply Voltage (for I/O
Buffer)
2.3
2.5
2.7
V
2
VREF
Input reference Voltage
0.49 x VDDQ
0.50 x VDDQ
0.51 x VDDQ
V
2, 3
VTT
Termination Voltage (System)
VREF - 0.04
VREF
VREF + 0.04
V
2, 8
VIH (DC)
Input High Voltage (DC)
VREF + 0.15
-
VDDQ + 0.3
V
2
VIL (DC)
Input Low Voltage (DC)
-0.3
-
VREF - 0.15
V
2
Differential Clock DC Input Voltage
-0.3
-
VDDQ + 0.3
V
15
0.36
-
VDDQ + 0.6
V
13, 15
VICK (DC)
VID (DC)
PARAMETER
Input Differential Voltage.
CLK and CLK inputs (DC)
UNIT NOTES
VIH (AC)
Input High Voltage (AC)
VREF + 0.31
-
-
V
2
VIL (AC)
Input Low Voltage (AC)
-
-
VREF - 0.31
V
2
0.7
-
VDDQ + 0.6
V
13, 15
Differential AC input Cross Point
Voltage
VDDQ/2 - 0.2
-
VDDQ/2 + 0.2
V
12, 15
Differential Clock AC Middle Point
VDDQ/2 - 0.2
-
VDDQ/2 + 0.2
V
14, 15
VID (AC)
VX (AC)
VISO (AC)
Input Differential Voltage.
CLK and CLK inputs (AC)
Notes: Undershoot Limit: VIL (min) = -1.5V with a pulse width < 5 nS
Overshoot Limit: VIH (max) = VDDQ +1.5V with a pulse width < 5 nS
VIH (DC) and VIL (DC) are levels to maintain the current logic state.
VIH (AC) and VIL (AC) are levels to change to the new logic state.
- 23 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
9.3
Capacitance
(VDD = VDDQ = 2.5V ±0.2V, f = 1 MHz, TA = 25 °C, VOUT (DC) = VDDQ/2, VOUT (Peak to Peak) = 0.2V)
MIN.
MAX.
DELTA
(MAX.)
UNIT
Input Capacitance (except for CLK pins)
2.0
3.0
0.5
pF
CCLK
Input Capacitance (CLK pins)
2.0
3.0
0.25
pF
CI/O
DQ, DQS, DM Capacitance
4.0
5.0
0.5
pF
CNC
NC Pin Capacitance
-
1.5
-
pF
SYMBOL
CIN
PARAMETER
Notes: These parameters are periodically sampled and not 100% tested.
9.4
Leakage and Output Buffer Characteristics
SYMBOL
II (L)
IO (L)
VOH
PARAMETER
Input Leakage Current
(0V < VIN < VDDQ, All other pins not under test = 0V)
Output Leakage Current
(Output disabled, 0V < VOUT < VDDQ)
Output High Voltage
(under AC test load condition)
IOH (DC)
Output Low Voltage
(under AC test load condition)
Output Minimum Source DC Current
IOL (DC)
Output Minimum Sink DC Current
IOH (DC)
Output Minimum Source DC Current
IOL (DC)
Output Minimum Sink DC Current
VOL
Full
Strength
Half
Strength
- 24 -
MIN.
MAX.
UNIT NOTES
-2
2
µA
-5
5
µA
VTT +0.76
-
V
-
VTT -0.76
V
-15.2
-
mA
4, 6
15.2
-
mA
4, 6
-10.4
-
mA
5
10.4
-
mA
5
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
9.5
DC Characteristics
SYM.
IDD0
IDD1
IDD2P
MAX.
PARAMETER
Operating current: One Bank Active-Precharge; tRC = tRC min; tCK
= tCK min; DQ, DM and DQS inputs changing twice per clock
cycle; Address and control inputs changing once per clock cycle
Operating current: One Bank Active-Read-Precharge; Burst = 2;
tRC = tRC min; CL = 3; tCK = tCK min; IOUT = 0 mA; Address and
control inputs changing once per clock cycle.
Precharge Power Down standby current: All Banks Idle; Power
down mode; CKE < VIL max; tCK = tCK min; Vin = VREF for DQ,
DQS and DM
UNIT
NOTES
-5
-6
-75
110
110
110
7
150
150
150
7, 9
20
20
20
IDD2F
Idle floating standby current: CS > VIH min; All Banks Idle; CKE
> VIH min; Address and other control inputs changing once per
clock cycle; Vin = VREF for DQ, DQS and DM
45
45
40
7
IDD2N
Idle standby current: CS > VIH min; All Banks Idle; CKE > VIH
min; tCK = tCK min; Address and other control inputs changing
once per clock cycle; Vin > VIH min or Vin < VIL max for DQ, DQS
and DM
45
45
40
7
40
40
35
7
20
20
20
70
70
65
7
180
170
160
7, 9
180
170
160
7
190
3
190
3
190
3
7
300
300
300
IDD2Q
IDD3P
IDD3N
IDD4R
IDD4W
IDD5
IDD6
IDD7
Idle quiet standby current: CS > VIH min; All Banks Idle; CKE >
VIH min; tCK = tCK min; Address and other control inputs stable;
Vin > VREF for DQ, DQS and DM
Active Power Down standby current: One Bank Active; Power
down mode; CKE < VIL max; tCK = tCK min
Active standby current: CS > VIH min; CKE > VIH min; One Bank
Active-Precharge; tRC = tRAS max; tCK = tCK min; DQ, DM and
DQS inputs changing twice per clock cycle; Address and other
control inputs changing once per clock cycle
Operating current: Burst = 2; Reads; Continuous burst; One Bank
Active; Address and control inputs changing once per clock cycle;
CL=3; tCK = tCK min; IOUT = 0mA
Operating current: Burst = 2; Write; Continuous burst; One Bank
Active; Address and control inputs changing once per clock cycle;
CL = 3; tCK = tCK min; DQ, DM and DQS inputs changing twice per
clock cycle
Auto Refresh current: tRC = tRFC min
Self Refresh current: CKE < 0.2V
Random Read current: 4 Banks Active Read with activate every
20nS, Auto-Precharge Read every 20 nS; Burst = 4; tRCD = 3; IOUT
= 0mA; DQ, DM and DQS inputs changing twice per clock cycle;
Address changing once per clock cycle
- 25 -
mA
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
9.6
AC Characteristics and Operating Condition
SYM.
-5
PARAMETER
MIN.
-6
MAX.
MIN.
-75
MAX.
MIN.
tRC
Active to Ref/Active Command Period
55
60
67.5
tRFC
Ref to Ref/Active Command Period
70
72
75
tRAS
Active to Precharge Command Period
40
tRCD
Active to Read/Write Command Delay Time
15
18
20
tRAP
Active to Read with Auto-precharge Enable
15
15
15
tCCD
Read/Write(a) to Read/Write(b) Command
Period
1
1
1
tRP
Precharge to Active Command Period
15
18
20
tRRD
Active(a) to Active(b) Command Period
10
12
15
tWR
Write Recovery Time
15
15
15
tDAL
Auto-precharge Write Recovery + Precharge
Time
-
-
-
CL = 2
tCK
tAC
tDQSCK
tDQSQ
CLK Cycle Time
7.5
70000
12
42
100000
7.5
12
45
7.5
MAX.
100000
tCK
CL = 2.5
6
12
6
12
7.5
12
CL = 3
5
12
6
12
7.5
12
Data Access Time from CLK, CLK
-0.7
-0.7
-0.7
0.7
-0.75
0.75
DQS Output Access Time from CLK, CLK
-0.6
0.6
-0.6
0.6
-0.75
0.75
nS
16
Data Strobe Edge to Output Data Edge Skew
0.4
0.45
5
0.55
0.45
0.55
0.45
0.55
tCL
CLK Low Level Width
0.45
0.55
0.45
0.55
0.45
0.55
tHP
CLK Half Period (minimum of actual tCH, tCL)
tQH
DQ Output Data Hold Time from DQS
min
min,
min,
(tCL,tCH)
(tCL,tCH)
(tCL,tCH)
tHP
tHP
tHP
-0.5
-0.55
-0.75
DQS Read Preamble Time
0.9
1.1
0.9
1.1
0.9
1.1
tRPST
DQS Read Postamble Time
0.4
0.6
0.4
0.6
0.4
0.6
DQ and DM Setup Time
0.4
0.45
11
tCK
11
0.5
DQ and DM Hold Time
0.4
0.45
0.5
tDIPW
DQ and DM Input Pulse Width (for each input)
1.75
1.75
1.75
tDQSH
DQS Input High Pulse Width
0.35
0.35
0.35
tDQSL
DQS Input Low Pulse Width
0.35
0.35
0.35
tDSS
DQS Falling Edge to CLK Setup Time
0.2
0.2
0.2
tDSH
DQS Falling Edge Hold Time from CLK
0.2
0.2
0.2
0
0
0
- 26 -
tCK
nS
tRPRE
Clock to DQS Write Preamble Set-up Time
18
12
0.45
tWPRES
nS
nS
CLk High Level Width
tDH
NOTES
tCK
tCH
tDS
UNIT
nS
tCK
11
nS
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
AC Characteristics and Operating Condition, continued
SYM.
-5
PARAMETER
MIN.
-6
MAX.
MIN.
-75
MAX.
MIN.
MAX.
tWPRE
DQS Write Preamble Time
0.25
tWPST
DQS Write Postamble Time
0.4
0.6
0.4
0.6
0.4
0.6
tDQSS
Write Command to First DQS Latching
0.72
Transition
1.25
0.75
1.25
0.75
1.25
0.25
UNIT
NOTES
0.25
tCK
11
tIS
Input Setup Time (fast slew rate)
0.6
0.75
0.9
19, 21-23
tIH
Input Hold Time (fast slew rate)
0.6
0.75
0.9
19, 21-23
tIS
Input Setup Time (slow slew rate)
0.7
0.8
1.0
20-23
Input Hold Time (slow slew rate)
0.7
0.8
1.0
20-23
Control & Address Input Pulse Width (for each
input)
2.2
2.2
2.2
tIH
tIPW
tHZ
tLZ
Data-out
High-impedance
Time
from
Low-impedance
Time
from
CLK, CLK
Data-out
CLK, CLK
nS
-0.7
0.7
-0.7
0.7
-0.75
0.75
-0.7
0.7
-0.7
0.7
-0.75
0.75
0.5
1.5
0.5
1.5
0.5
1.5
tT(SS)
SSTL Input Transition
tWTR
Internal Write to Read Command Delay
tXSNR
Exit Self Refresh to non-Read Command
75
75
75
nS
tXSRD
Exit Self Refresh to Read Command
200
200
200
tCK
tREFi
Refresh Interval Time (8k/ 64mS)
tMRD
Mode Register Set Cycle Time
9.7
2
1
1
7.8
10
7.8
12
tCK
7.8
15
µS
17
nS
AC Test Conditions
PARAMETER
SYMBOL
VALUE
UNIT
Input High Voltage (AC)
VIH
VREF + 0.31
V
Input Low Voltage (AC)
VIL
VREF - 0.31
V
Input Reference Voltage
VREF
0.5 x VDDQ
V
Termination Voltage
VTT
0.5 x VDDQ
V
Differential Clock Input Reference Voltage
VR
Vx (AC)
V
VID (AC)
1.5
V
VOTR
0.5 x VDDQ
V
Input Difference Voltage. CLK and CLK Inputs (AC)
Output Timing Measurement Reference Voltage
- 27 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
VTT
VDDQ
VIH min (AC)
VREF
V SWING (MAX)
50 Ω
VIL max (AC)
VSS
T
T
Output
Output
V(out)
30pF
SLEW = (VIH min (AC) - VILmax (AC)) / T
Timing Reference Load
Notes:
(1)
Conditions outside the limits listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
(2)
All voltages are referenced to VSS, VSSQ.
(3)
Peak to peak AC noise on VREF may not exceed ±2% VREF(DC).
(4)
VOH = 1.95V, VOL = 0.35V
(5)
VOH = 1.9V, VOL = 0.4V
(6)
The values of IOH(DC) is based on VDDQ = 2.3V and VTT = 1.19V.
The values of IOL(DC) is based on VDDQ = 2.3V and VTT = 1.11V.
(7)
These parameters depend on the cycle rate and these values are measured at a cycle rate with the minimum values
of tCK and tRC.
(8)
VTT is not applied directly to the device. VTT is a system supply for signal termination resistors is expected to be set
equal to VREF and must track variations in the DC level of VREF.
(9)
These parameters depend on the output loading. Specified values are obtained with the output open.
(10) Transition times are measured between VIH min(AC) and VIL max(AC).Transition (rise and fall) of input signals have a fixed
slope.
(11) IF the result of nominal calculation with regard to tCK contains more than one decimal place, the result is rounded up to
the nearest decimal place.
(i.e., tDQSS = 0.75 × tCK, tCK = 7.5 nS, 0.75 × 7.5 nS = 5.625 nS is rounded up to 5.6 nS.)
(12) VX is the differential clock cross point voltage where input timing measurement is referenced.
(13) VID is magnitude of the difference between CLK input level and CLK input level.
(14) VISO means {VICK(CLK)+VICK( CLK )}/2.
(15) Refer to the figure below.
- 28 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
CLK
VX
VX
VX
VICK
VX
VICK
VX
VID(AC)
CLK
VICK
VICK
VSS
VID(AC)
0 V Differential
VISO
VISO(min)
VISO(max)
VSS
(16) tAC and tDQSCK depend on the clock jitter. These timing are measured at stable clock.
(17) A maximum of eight AUTO REFRESH commands can be posted to any given DDR SDRAM device.
(18) tDAL = (tWR/tCK) + (tRP/tCK)
(19) For command/address input slew rate ≥1.0 V/nS.
(20) For command/address input slew rate ≥0.5 V/nS and <1.0 V/nS.
(21) For CLK & CLK slew rate ≥1.0 V/nS (single--ended).
(22) These parameters guarantee device timing, but they are not necessarily tested on each device. They may be
guaranteed by device design or tester correlation.
(23) Slew Rate is measured between VOH(ac) and VOL(ac).
- 29 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
10. SYSTEM CHARACTERISTICS FOR DDR SDRAM
The following specification parameters are required in systems using DDR400, DDR333 & DDR266
devices to ensure proper system performance. These characteristics are for system simulation
purposes and are guaranteed by design.
10.1 Table 1: Input Slew Rate for DQ, DQS, and DM
AC CHARACTERISTICS
DDR400
DDR333
DDR266
PARAMETER
SYMBOL
MIN.
MAX.
MIN.
MAX.
MIN.
MAX. UNIT
DQ/DM/DQS input slew rate
measured between VIH(DC),
VIL(DC) and VIL(DC), VIH(DC)
DCSLEW
0.5
4.0
0.5
4.0
0.5
4.0
V/nS
NOTES
a, m
10.2 Table 2: Input Setup & Hold Time Derating for Slew Rate
INPUT SLEW RATE
ΔtIS
ΔtIH
UNIT
NOTES
0.5 V/nS
0.4 V/nS
0.3 V/nS
0
+50
+100
0
0
0
pS
pS
pS
i
i
i
10.3 Table 3: Input/Output Setup & Hold Time Derating for Slew Rate
INPUT SLEW RATE
ΔtDS
ΔtDH
UNIT
NOTES
0.5 V/nS
0.4 V/nS
0.3 V/nS
0
+75
+150
0
0
0
pS
pS
pS
k
k
k
10.4 Table 4: Input/Output Setup & Hold Derating for Rise/Fall Delta Slew Rate
INPUT SLEW RATE
ΔtDS
ΔtDH
UNIT
NOTES
±0.0 nS/V
0
0
pS
j
±0.25 nS/V
+50
0
pS
j
±0.5 nS/V
+100
0
pS
j
10.5 Table 5: Output Slew Rate Characteristics (X8 Devices only)
SLEW RATE
CHARACTERISTIC
TYPICAL
RANGE (V/NS)
MINIMUM
(V/NS)
MAXIMUM
(V/NS)
NOTES
Pullup Slew Rate
Pulldown Slew Rate
1.2 ~ 2.5
1.2 ~ 2.5
1.0
1.0
4.5
4.5
a, c, d, f, g, h
b, c, d, f, g, h
- 30 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
10.6 Table 6: Output Slew Rate Matching Ratio Characteristics
SLEW RATE CHARACTERISTIC
DDR400
DDR333
DDR266
PARAMETER
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
NOTES
Output Slew Rate Matching Ratio
(Pullup to Pulldown)
0.67
1.5
0.67
1.5
0.67
1.5
e, m
10.7 Table 7: AC Overshoot/Undershoot Specification for Address and Control
Pins
SPECIFICATION
PARAMETER
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
The area between the overshoot signal and VDD
must be less than or equal to Max. area in Figure 3
The area between the undershoot signal and GND
must be less than or equal to Max. area in Figure 3
DDR400
DDR333
DDR266
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
3.0 V-nS
3.6 V-nS
4.5 V-nS
3.0 V-nS
3.6 V-nS
4.5 V-nS
Figure 3: Address and Control AC Overshoot and Undershoot Definition
- 31 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
10.8 Table 8: Overshoot/Undershoot Specification for Data, Strobe, and Mask Pins
SPECIFICATION
PARAMETER
DDR400
DDR333
DDR266
Maximum peak amplitude allowed for overshoot
1.2 V
1.2 V
1.2 V
Maximum peak amplitude allowed for undershoot
1.2 V
1.2 V
1.2 V
The area between the overshoot signal and VDD
must be less than or equal to Max. area in Figure 4
1.44 V-nS
2.25 V-nS
2.4 V-nS
The area between the undershoot signal and GND
must be less than or equal to Max. area in Figure 4
1.44 V-nS
2.25 V-nS
2.4 V-nS
VDD
Overshoot
5
Max. amplitude = 1.2V
4
3
2
Max. area
1
0
-1
-2
Max. amplitude = 1.2V
-3
GND
-4
-5
0
0.5 1.0 1.42 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 5.68 6.0 6.5 7.0
Time (nS)
Undershoot
Figure 4: DQ/DM/DQS AC Overshoot and Undershoot Definition
- 32 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
10.9 System Notes:
a. Pullup slew rate is characterized under the test conditions as shown in Figure 1.
Test point
Output
50 Ω
VSSQ
Figure 1: Pullup slew rate test load
b. Pulldown slew rate is measured under the test conditions shown in Figure 2.
Figure 2: Pulldown slew rate test load
c. Pullup slew rate is measured between (VDDQ/2 - 320 mV ± 250 mV)
Pulldown slew rate is measured between (VDDQ/2 + 320 mV ± 250 mV)
Pullup and Pulldown slew rate conditions are to be met for any pattern of data, including all outputs
switching and only one output switching.
Example: For typical slew rate, DQ0 is switching
For minimum slew rate, all DQ bits are switching worst case pattern
For maximum slew rate, only one DQ is switching from either high to low, or low to high
The remaining DQ bits remain the same as for previous state
d. Evaluation conditions
Typical:
25 oC (T Ambient), VDDQ = nominal, typical process
Minimum:
70 oC (T Ambient), VDDQ = minimum, slow-slow process
Maximum:
0 oC (T Ambient), VDDQ = maximum, fast-fast process
e. The ratio of pullup slew rate to pulldown slew rate is specified for the same temperature and
voltage, over the entire temperature and voltage range. For a given output, it represents the
maximum difference between pullup and pulldown drivers due to process variation.
- 33 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
f. Verified under typical conditions for qualification purposes.
g. TSOP II package devices only.
h. Only intended for operation up to 266 Mbps per pin.
i. A derating factor will be used to increase tIS and tIH in the case where the input slew rate is below
0.5 V/nS as shown in Table 2. The Input slew rate is based on the lesser of the slew rates
determined by either VIH(AC) to VIL(AC) or VIH(DC) to VIL(DC), similarly for rising transitions.
j. A derating factor will be used to increase tDS and tDH in the case where DQ, DM, and DQS slew
rates differ, as shown in Tables 3 & 4. Input slew rate is based on the larger of AC-AC delta rise,
fall rate and DC-DC delta rise, fall rate. Input slew rate is based on the lesser of the slew rates
determined by either VIH(AC) to VIL(AC) or VIH(DC) to VIL(DC), similarly for rising transitions.
The delta rise/fall rate is calculated as:
{1/(Slew Rate1)}-{1/(slew Rate2)}
For example: If Slew Rate 1 is 0.5 V/nS and Slew Rate 2 is 0.4 V/nS, then the delta rise, fall rate is
-0.5 nS/V. Using the table given, this would result in the need for an increase in tDS and tDH of 100
pS.
k. Table 3 is used to increase tDS and tDH in the case where the I/O slew rate is below 0.5 V/nS. The
I/O slew rate is based on the lesser of the AC-AC slew rate and the DC-DC slew rate. The input
slew rate is based on the lesser of the slew rates determined by either VIH(AC) to VIL(AC) or VIH(DC)
to VIL(DC), and similarly for rising transitions.
m. DQS, DM, and DQ input slew rate is specified to prevent double clocking of data and preserve
setup and hold times. Signal transitions through the DC region must be monotonic.
- 34 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11. TIMING WAVEFORMS
11.1 Command Input Timing
tCK
tCK
tCH
tCL
CLK
CLK
tIS
tIH
CS
tIS
tIH
tIS
tIH
tIS
tIH
tIS
tIH
RAS
CAS
WE
A0~A12
BS0, 1
Refer to the Command Truth Table
11.2 Timing of the CLK Signals
tCL
tCH
CLK
CLK
tT
tT
VIH
VIH(AC)
VIL(AC)
VIL
tCK
CLK
CLK
VIH
VX
VX
- 35 -
VX
VIL
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.3 Read Timing (Burst Length = 4)
tCH
tCL
tCK
CLK
CLK
tIH
tIS
CMD
READ
tIS
ADD
tIH
Col
tDQSCK
tDQSCK
tRPST
tDQSCK
CAS Latency = 2
tRPRE
Hi-Z
Hi-Z
DQS
tQH
Preamble
Output
(Data)
Hi-Z
tDQSQ
tQH
QA0
DA0
QA1
DA1
Postamble
tDQSQ
tDQSQ
QA2
DA2
QA3
DA3
tAC
Hi-Z
tHZ
tDQSCK
tLZ
tDQSCK
tDQSCK
tRPRE
CAS Latency = 3
tRPST
Hi-Z
Hi-Z
DQS
tQH
Preamble
Output
(Data)
Hi-Z
tDQSQ
tQH
QA0
DA0
QA1
DA1
Postamble
tDQSQ
tDQSQ
QA2
DA2
QA3
DA3
Hi-Z
tAC
tLZ
- 36 -
tHZ
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.4 Write Timing (Burst Length = 4)
tCH
tCL
tCK
CLK
CLK
CMD
WRIT
tIS
ADD
tIH
tDSS
tDSH
tDSS
tDQSL
tDQSH
tWPST
tDS
tDS
tDSH
Col
tWPRES
tDQSH
tWPRE
DQS
Preamble
Postamble
tDS
tDH
Input
(Data)
DA0
tDQSS
DA1
tDSH
tDH
tDH
DA2
tDSS
DA3
tDSH
- 37 -
tDSS
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.5 DM, DATA MASK (W9425G8EH)
C LK
C LK
CMD
W R IT
DQS
tD S
tD S
tD H
tD H
DM
t D IP W
DQ
D0
t D IPW
D1
D3
M asked
- 38 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.6 Mode Register Set (MRS) Timing
CLK
CLK
tMRD
CMD
MRS
ADD
Register Set data
NEXT CMD
Burst Length
A0
Burst Length
A1
A2
Addressing Mode
A3
A4
CAS Latency
A5
A2
A1
A0
Sequential
Interleaved
0
0
0
Reserved
Reserved
0
0
1
2
2
0
1
0
4
4
0
1
1
8
8
1
0
0
Reserved
Reserved
1
0
1
1
1
0
1
1
1
A6
A7
"0"
A10
Reserved
DLL Reset
A8
A9
"0"
"0"
Reserved
A11
Addressing Mode
A3
"0"
A12
"0"
BS0
"0"
BS1
"0"
Mode Register Set
or
Extended Mode
Register Set
0
Sequential
1
Interleaved
A5
A4
0
0
0
0
0
1
0
1
0
2
0
1
1
3
1
0
0
Reserved
1
0
1
1
1
0
2.5
1
1
1
Reserved
* "Reserved" should stay "0" during MRS cycle.
Reserved
DLL Reset
A8
- 39 -
CAS Latency
A6
0
No
1
Yes
BS1
BS0
MRS or EMRS
0
0
Regular MRS cycle
0
1
Extended MRS cycle
1
0
1
1
Reserved
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.7 Extend Mode Register Set (EMRS) Timing
CLK
CLK
tMRD
CMD
EMRS
ADD
Register Set data
Output Driver
A1
A2
"0"
A3
"0"
A4
"0"
A5
"0"
A6
"0"
A7
"0"
A8
"0"
"0"
A11
"0"
A12
"0"
BS0
"0"
BS1
"0"
0
Enable
1
Disable
A1
Output Driver Size
0
Full Strength
1
Half Strength
Reserved
"0"
A10
DLL Switch
A0
DLL Switch
A0
A9
NEXT CMD
BS1
BS0
MRS or EMRS
0
0
Regular MRS cycle
0
1
Extended MRS cycle
1
0
1
1
Mode Register Set
or
Extended Mode
Register Set
* "Reserved" should stay "0" during EMRS cycle.
- 40 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.8 Auto-precharge Timing (Read Cycle, CL = 2)
1) tRCD (READA) ≥ tRAS(min) – (BL/2) × tCK
tRAS
tRP
CLK
CLK
BL=2
CMD
ACT
READA
ACT
AP
DQS
DQ
Q0
Q1
BL=4
CMD
ACT
READA
ACT
AP
DQS
DQ
Q0
Q1
Q2
Q3
BL=8
CMD
ACT
AP
READA
ACT
DQS
DQ
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Notes: CL=2 shown; same command operation timing with CL = 2.5 and CL=3
In this case, the internal precharge operation begin after BL/2 cycle from READA command.
AP
Represents the start of internal precharging.
The Read with Auto-precharge command cannot be interrupted by any other command.
- 41 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.9 Auto-precharge Timing (Read cycle, CL = 2), continued
2) tRCD/RAP(min) ≤ tRCD (READA) < tRAS(min) – (BL/2) × tCK
tRAS
tRP
CLK
CLK
BL=2
CMD
ACT
READA
AP
ACT
AP
ACT
tRAP
tRCD
DQS
DQ
Q0
Q1
BL=4
CMD
ACT
READA
tRAP
tRCD
DQS
DQ
Q0
Q1
Q2
Q3
BL=8
CMD
ACT
READA
ACT
AP
tRAP
tRCD
DQS
DQ
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Notes: CL2 shown; same command operation timing with CL = 2.5, CL=3.
In this case, the internal precharge operation does not begin until after tRAS (min) has command.
AP
Represents the start of internal precharging.
The Read with Auto-precharge command cannot be interrupted by any other command.
- 42 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.10 Auto-precharge Timing (Write Cycle)
CLK
CLK
tDAL
BL=2
CMD
AP
WRITA
ACT
DQS
DQ
D0
D1
tDAL
BL=4
CMD
WRITA
ACT
AP
DQS
DQ
D0
D1
D2
D3
tDAL
BL=8
CMD
WRITA
AP
ACT
DQS
DQ
D0
D1
D2
D3
D4
D5
D6
D7
The Write with Auto-precharge command cannot be interrupted by any other command.
AP
Represents the start of internal precharging.
- 43 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.11 Read Interrupted by Read (CL = 2, BL = 2, 4, 8)
CLK
CLK
CMD
ACT
READ A
tRCD
ADD
READ B
READ C
tCCD
Row
Address
COl,Add,A
tCCD
Col,Add,B
READ D
tCCD
Col,Add,C
READ E
tCCD
Col,Add,D
Col,Add,E
DQS
DQ
QA0
QA1
QB0
QB1
QC0
11.12 Burst Read Stop (BL = 8)
CLK
CLK
CMD
READ
BST
CAS Latency = 2
DQS
CAS Latency
DQ
Q0
Q1
Q2
Q3
Q4
Q5
CAS Latency = 3
DQS
CAS Latency
DQ
Q0
Q1
Q2
- 44 -
Q3
Q4
Q5
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.13 Read Interrupted by Write & BST (BL = 8)
CLK
CLK
CAS Latency = 2
CMD
READ
BST
WRIT
DQS
DQ
Q0
Q1
Q2
Q3
Q4
Q5
D0
D1
D2
D3
D4
D5
D6
D7
Burst Read cycle must be terminated by BST Command to avoid I/O conflict.
11.14 Read Interrupted by Precharge (BL = 8)
CLK
CLK
CM D
READ
PRE
CAS Latency = 2
DQ S
CAS Latency
DQ
Q0
Q1
Q2
Q3
Q4
Q5
CAS Latency = 3
DQ S
C AS Latency
DQ
Q0
Q1
Q2
- 45 -
Q3
Q4
Q5
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.15 Write Interrupted by Write (BL = 2, 4, 8)
CLK
CLK
CMD
ACT
WRIT A
tRCD
tCCD
Row
Address
ADD
WRIT B
COl. Add. A
WRIT C
tCCD
Col.Add.B
WRIT D
tCCD
Col. Add. C
WRIT E
tCCD
Col. Add. D
Col. Add. E
DQS
DQ
DA0
DA1
DB0
DB1
DC0
DC1
DD0
DD1
11.16 Write Interrupted by Read (CL = 2, BL = 8)
CLK
CLK
CMD
WRIT
READ
DQS
DM
tWTR
DQ
D0
D1
D2
D3
Data must be
masked by DM
D4
D5
D6
D7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Data masked by READ
command, DQS input ignored.
- 46 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.17 Write Interrupted by Read (CL = 3, BL = 4)
CLK
CLK
CMD
WRIT
READ
DQS
DM
tWTR
DQ
D0
D1
D2
D3
Q0
Q1
Q2
Q3
Data must be masked by DM
11.18 Write Interrupted by Precharge (BL = 8)
CLK
CLK
CMD
WRIT
PRE
ACT
tWR
tRP
DQS
DM
DQ
D0
D1
D2
D3
D4
D5
Data must be
masked by DM
D6
D7
Data masked by PRE command,
DQS input ignored.
- 47 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.19 2 Bank Interleave Read Operation (CL = 2, BL = 2)
∗ tCK = 100 MHz
CLK
CLK
tRC(b)
tRC(a)
tRRD
CMD
ACTa
tRRD
ACTb
READAa
READAb
ACTa
ACTb
tRCD(a)
tRAS(a)
tRP(a)
tRCD(b)
tRAS(b)
tRP(b)
DQS
Preamble
Postamble
CL(a)
Q0a
DQ
ACTa/b
: Bank Act. CMD of bank a/b
READAa/b : Read with Auto Pre.CMD of bank a/b
APa/b
: Auto Pre. of bank a/b
Preamble
Postamble
CL(b)
Q1a
APa
Q0b
Q1b
APb
11.20 2 Bank Interleave Read Operation (CL = 2, BL = 4)
CLK
CLK
tRC(b)
tRC(a)
tRRD
tRRD
CMD
ACTa
ACTb
READAa
READAb
ACTa
ACTb
tRCD(a)
tRAS(a)
tRP(a)
tRCD(b)
tRAS(b)
tRP(b)
DQS
Preamble
Postamble
CL(a)
CL(b)
Q0a
DQ
ACTa/b
: Bank Act. CMD of bank a/b
READAa/b : Read with Auto Pre.CMD of bank a/b
APa/b
: Auto Pre. of bank a/b
- 48 -
APa
Q1a
Q2a
Q3a
Q0b
Q1b
Q2b
Q3b
APb
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.21 4 Bank Interleave Read Operation (CL = 2, BL = 2)
CLK
CLK
t R C(a)
tR R D
t R RD
CMD
AC Ta
AC Tb
tR R D
ACTc
tR R D
R EADAa
ACTd
R EAD Ab
AC Ta
READ Ac
t R C D (a)
t R AS(a)
tR P
t R C D (b)
t R AS(b)
t R C D(c)
t RAS(c)
t R C D (d)
t RAS(d)
DQS
Pream ble
Postam ble
C L(a)
Q 0a
DQ
ACTa/b/c/d
: Bank Act. C M D of bank a/b/c/d
READ Aa/b/c/d : Read w ith Auto Pre.CM D of bank a/b/c/d
APa/b/c/d
: Auto Pre. of bank a/b/c/d
Pream ble
CL(b)
Q 1a
APa
Q0b
Q 1b
APb
11.22 4 Bank Interleave Read Operation (CL = 2, BL = 4)
CLK
CLK
t R C (a )
tR R D
tR R D
CMD
ACTa
ACTb
READAa
tR R D
ACTc
tR R D
READAb
ACTd
READAc
ACTa
READAd
t R C D (a )
t R A S (a )
t R P (a )
t R C D (b )
t R A S (b )
t R C D (c )
t R A S (c )
t R C D (d )
t R A S (d )
DQS
P re a m b le
C L (a )
C L (b )
Q 0a
DQ
A C T a /b /c /d
: B a n k A c t. C M D o f b a n k a /b /c /d
R E A D A a /b /c /d : R e a d w ith A u to P re .C M D o f b a n k a /b /c /d
A P a /b /c /d
: A u to P re . o f b a n k a /b /c /d
- 49 -
APa
Q1a
Q 0a
C L (c )
Q 1a
Q2a
APb
Q 3a
Q0b
Q 1b
Q 2b
Q3b
APc
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.23 Auto Refresh Cycle
CLK
CLK
CMD
PREA
NOP
AREF
NOP
tRP
AREF
CMD
NOP
tRFC
tRFC
Note: CKE has to be kept “High” level for Auto-Refresh cycle.
11.24 Precharge/Activate Power Down Mode Entry and Exit Timing
CLK
CLK
tIH
tIS
tCK
tIH
tIS
CKE
Precharge/Activate
Note 1,2
Entry
CMD
CMD
Exit
NOP
NOP
CMD
NOP
Note:
1. If power down occurs when all banks are idle, this mode is referred to as precharge power down.
2. If power down occurs when there is a row active in any bank, this mode is referred to as active power down.
11.25 Input Clock Frequency Change during Precharge Power Down Mode Timing
CLK
CLK
NOP
CMD
NOP
NOP
Frequency Change
Occurs here
CKE
DLL
RESET
NOP
NOP
CMD
tIS
200 clocks
tRP
Minmum 2 clocks
required before
changing frequency
Stable new clock
before power down exit
- 50 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
11.26 Self Refresh Entry and Exit Timing
CLK
CLK
tIH
tIS
tIH
tIS
CKE
CMD
PREA
NOP
SELF
SELEX
Entry
Exit
NOP
CMD
tRP
tXSNR
tXSRD
SELF
SELFX
Entry
Exit
NOP
ACT
NOP
READ
NOP
Note:
If the clock frequency is changed during self refresh mode, a DLL reset is required upon exit.
- 51 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
12. PACKAGE SPECIFICATION
12.1 TSOP 66 lI – 400 mil
E1
E
D
O
O1
L
L1
O
O1
- 52 -
Publication Release Date: Jul. 04, 2008
Revision A01
W9425G8EH
13. REVISION HISTORY
VERSION
DATE
PAGE
A01
Jul. 04, 2008
All
DESCRIPTION
Formally data sheet
Important Notice
Winbond products are not designed, intended, authorized or warranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control
instruments, airplane or spaceship instruments, transportation instruments, traffic signal
instruments, combustion control instruments, or for other applications intended to support or
sustain life. Further more, Winbond products are not intended for applications wherein failure
of Winbond products could result or lead to a situation wherein personal injury, death or
severe property or environmental damage could occur.
Winbond customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Winbond for any damages resulting from such improper
use or sales.
- 53 -
Publication Release Date: Jul. 04, 2008
Revision A01