Elpida EDE2508ACSE-6E-E 256m bits ddr2 sdram Datasheet

PRELIMINARY DATA SHEET
256M bits DDR2 SDRAM
EDE2508ACSE (32M words × 8 bits)
EDE2516ACSE (16M words × 16 bits)
Features
• Density: 256M bits
• Organization
⎯ 8M words × 8 bits × 4 banks (EDE2508ACSE)
⎯ 4M words × 16 bits × 4 banks (EDE2516ACSE)
• Package
⎯ 60-ball FBGA (EDE2508ACSE)
⎯ 84-ball FBGA (EDE2516ACSE)
⎯ Lead-free (RoHS compliant)
• Power supply: VDD, VDDQ = 1.8V ± 0.1V
• Data rate: 800Mbps/667Mbps/533Mbps (max.)
• 1KB page size
⎯ Row address: A0 to A12
⎯ Column address: A0 to A9 (EDE2508ACSE)
A0 to A8 (EDE2516ACSE)
• Four internal banks for concurrent operation
• Interface: SSTL_18
• Burst lengths (BL): 4, 8
• Burst type (BT):
⎯ Sequential (4, 8)
⎯ Interleave (4, 8)
• /CAS Latency (CL): 4, 5
• Precharge: auto precharge option for each burst
access
• Driver strength: normal/weak
• Refresh: auto-refresh, self-refresh
• Double-data-rate architecture; two data transfers per
clock cycle
• The high-speed data transfer is realized by the 4 bits
prefetch pipelined architecture
• Bi-directional differential data strobe (DQS and /DQS)
is transmitted/received with data for capturing data at
the receiver
• DQS is edge-aligned with data for READs; centeraligned with data for WRITEs
• Differential clock inputs (CK and /CK)
• DLL aligns DQ and DQS transitions with CK
transitions
• Commands entered on each positive CK edge; data
and data mask referenced to both edges of DQS
• Data mask (DM) for write data
• Posted /CAS by programmable additive latency for
better command and data bus efficiency
• Off-Chip-Driver Impedance Adjustment and On-DieTermination for better signal quality
• Programmable RDQS, /RDQS output for making × 8
organization compatible to × 4 organization
• /DQS, (/RDQS) can be disabled for single-ended
Data Strobe operation
L
EO
Specifications
Document No. E0948E30 (Ver. 3.0)
Date Published April 2007 (K) Japan
Printed in Japan
URL: http://www.elpida.com
ct
⎯ Average refresh period
7.8μs at 0°C ≤ TC ≤ +85°C
3.9μs at +85°C < TC ≤ +95°C
• Operating case temperature range
⎯ TC = 0°C to +95°C
u
od
Pr
• Refresh cycles: 8192 cycles/64ms
This product became EOL in June, 2010.
©Elpida Memory, Inc. 2006-2007
EDE2508ACSE, EDE2516ACSE
Ordering Information
Part number
EDE2508ACSE-8E-E
EDE2508ACSE-6E-E
EDE2508ACSE-5C-E
EDE2516ACSE-8E-E
EDE2516ACSE-6E-E
EDE2516ACSE-5C-E
Mask
version
C
Organization
(words × bits)
Internal
Banks
32M × 8
Speed bin
(CL-tRCD-tRP)
Package
DDR2-800 (5-5-5)
DDR2-667 (5-5-5)
DDR2-533 (4-4-4)
DDR2-800 (5-5-5)
DDR2-667 (5-5-5)
DDR2-533 (4-4-4)
4
16M × 16
60-ball FBGA
84-ball FBGA
L
EO
Part Number
E D E 25 08 A C SE - 8E - E
Elpida Memory
Type
D: Monolithic Device
Environment code
E: Lead Free
(RoHS compliant)
Product Family
E: DDR2
Speed
8E: DDR2-800 (5-5-5)
6E: DDR2-667 (5-5-5)
5C: DDR2-533 (4-4-4)
Density / Bank
25: 256Mb /4-bank
Power Supply, Interface
A: 1.8V, SSTL_18
Package
SE: FBGA
Die Rev.
ct
u
od
Pr
Organization
08: x8
16: x16
Preliminary Data Sheet E0948E30 (Ver. 3.0)
2
EDE2508ACSE, EDE2516ACSE
Pin Configurations
/xxx indicates active low signal.
84-ball FBGA
(×16 organization)
60-ball FBGA
(×8 organization)
1
2
3
7
8
9
A
VDD NU/ /RDQS VSS
1
2
3
7
8
9
VDD
NC
VSS
VSSQ /UDQS VDDQ
DQ14 VSSQ UDM
UDQS VSSQ DQ15
VDDQ
VDDQ
A
VSSQ /DQS VDDQ
B
B
VSSQ DM/RDQS
DQS
VSSQ
DQ7
L
EO
DQ6
C
VDDQ
DQ1 VDDQ
VDDQ
DQ0
C
VDDQ
D
VSSQ
DQ3
DQ2
VSSQ
DQ5
VDDL VREF
VSS
VSSDL
CK
VDD
DQ4
D
E
/WE
/RAS
/CK
BA0
BA1
/CAS
ODT
A1
A2
/CS
A0
VSS
A3
A5
A6
A4
A7
A9
A11
A8
VDD
A12
NC
VDD
NC
VSS
VSSQ /LDQS VDDQ
DQ6
VSSQ
LDM
LDQS VSSQ
VDDQ
DQ1 VDDQ
VDD
NC
DQ7
VDDQ
DQ0
VDDQ
VSSQ
DQ3
DQ2
VSSQ
DQ5
VDDL VREF
VSS
VSSDL
CK
VDD
/WE
/RAS
/CK
ODT
BA0
BA1
/CAS
/CS
A10
A1
A2
A0
A3
A5
A6
A4
A7
A9
A11
A8
DQ4
J
K
VSS
CKE
L
Pr
L
DQ10 VSSQ DQ13
H
J
K
DQ12 VSSQ DQ11
G
H
A10
VDDQ
F
G
NC
DQ8
E
F
CKE
DQ9 VDDQ
NC
NC
M
(Top view)
VDD
N
VSS
P
VSS
u
od
R
VDD
A12
NC
NC
NC
(Top view)
Pin name
Function
A0 to A12
Address inputs
BA0, BA1
Bank select
DQ0 to DQ15
Data input/output
DQS, /DQS
UDQS, /UDQS
LDQS, /LDQS
Differential data strobe
Pin name
Function
ODT
ODT control
VDD
Supply voltage for internal circuit
VSS
Ground for internal circuit
VDDQ
Supply voltage for DQ circuit
Differential data strobe for read
VSSQ
/CS
Chip select
VREF
/RAS, /CAS, /WE
Command input
VDDL
CKE
Clock enable
VSSDL
CK, /CK
Differential clock input
NC*
1
DM
UDM, LDM
Write data mask
NU*
2
Notes: 1. Not internally connected with die.
2. Don’t use other than reserved functions.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
3
ct
RDQS, /RDQS
Ground for DQ circuit
Input reference voltage
Supply voltage for DLL circuit
Ground for DLL circuit
No connection
Not usable
EDE2508ACSE, EDE2516ACSE
CONTENTS
L
EO
Specifications.................................................................................................................................................1
Features.........................................................................................................................................................1
Ordering Information......................................................................................................................................2
Part Number ..................................................................................................................................................2
Pin Configurations .........................................................................................................................................3
Electrical Specifications.................................................................................................................................5
Block Diagram .............................................................................................................................................28
Pin Function.................................................................................................................................................29
Command Operation ...................................................................................................................................31
Simplified State Diagram .............................................................................................................................39
Operation of DDR2 SDRAM ........................................................................................................................40
Package Drawing ........................................................................................................................................77
Recommended Soldering Conditions..........................................................................................................79
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
4
EDE2508ACSE, EDE2516ACSE
Electrical Specifications
• All voltages are referenced to VSS (GND)
• Execute power-up and Initialization sequence before proper device operation is achieved.
Absolute Maximum Ratings
Symbol
Rating
Unit
Notes
Power supply voltage
VDD
−1.0 to +2.3
V
1
Power supply voltage for output
VDDQ
−0.5 to +2.3
V
1
Power supply voltage for DLL
VDDL
−0.5 to +2.3
V
1
Input voltage
VIN
−0.5 to +2.3
V
1
Output voltage
VOUT
−0.5 to +2.3
V
1
L
EO
Parameter
Storage temperature
Tstg
−55 to +100
°C
1, 2
Power dissipation
PD
1.0
W
1
Short circuit output current
IOUT
50
mA
1
Notes: 1. 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.
2. Storage temperature is the case surface temperature on the center/top side of the DRAM.
Caution
Pr
Exposing the device to stress above those listed in Absolute Maximum Ratings could cause
permanent damage. The device is not meant to be operated under conditions outside the limits
described in the operational section of this specification. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
Operating Temperature Condition
Parameter
TC
Rating
Unit
Notes
°C
1, 2
u
od
Operating case temperature
Symbol
0 to +95
Notes: 1. Operating temperature is the case surface temperature on the center/top side of the DRAM.
2. Supporting 0°C to +85°C with full AC and DC specifications.
Supporting 0°C to +85°C and being able to extend to +95°C with doubling auto-refresh commands in
frequency to a 32ms period (tREFI = 3.9μs) and higher temperature Self-Refresh entry via A7 "1" on
EMRS (2).
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
5
EDE2508ACSE, EDE2516ACSE
Recommended DC Operating Conditions (SSTL_18)
Parameter
Symbol
min.
typ.
max.
Unit
Notes
Supply voltage
VDD
1.7
1.8
1.9
V
4
Supply voltage for output
VDDQ
1.7
1.8
1.9
V
4
1.9
VDDL
1.7
1.8
V
4
Input reference voltage
VREF
0.49 × VDDQ
0.50 × VDDQ 0.51 × VDDQ
V
1, 2
Termination voltage
VTT
VREF − 0.04
VREF
VREF + 0.04
V
3
DC input logic high
VIH (DC)
VREF + 0.125
⎯
VDDQ + 0.3
V
DC input low
VIL (DC)
−0.3
⎯
VREF – 0.125
V
AC input logic high
-8E, -6E
VIH (AC)
VREF + 0.200
⎯
⎯
V
VIH (AC)
VREF + 0.250
⎯
⎯
V
VIL (AC)
⎯
⎯
VREF − 0.200
V
VIL (AC)
⎯
⎯
VREF − 0.250
V
L
EO
Power supply voltage for DLL
-5C
AC input low
-8E, -6E
-5C
Notes: 1. The value of VREF may be selected by the user to provide optimum noise margin in the system. Typically
the value of VREF is expected to be about 0.5 × VDDQ of the transmitting device and VREF are expected
to track variations in VDDQ.
2. Peak to peak AC noise on VREF may not exceed ±2% VREF (DC).
3. VTT of transmitting device must track VREF of receiving device.
4. VDDQ tracks with VDD, VDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and
VDDL tied together.
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
6
EDE2508ACSE, EDE2516ACSE
AC Overshoot/Undershoot Specification
Pins
Specification
Unit
Maximum peak amplitude allowed for overshoot
Command, Address,
CKE, ODT
0.5
V
Maximum peak amplitude allowed for undershoot
0.5
V
Maximum overshoot area above VDD
DDR2-800
0.66
V-ns
DDR2-667
0.8
V-ns
DDR2-533
1.0
V-ns
0.66
V-ns
DDR2-667
0.8
V-ns
DDR2-533
1.0
V-ns
0.5
V
Maximum peak amplitude allowed for undershoot
0.5
V
Maximum overshoot area above VDD
DDR2-800, 667
0.23
V-ns
0.28
V-ns
0.23
V-ns
0.28
V-ns
0.5
V
0.5
V
0.23
V-ns
0.28
V-ns
0.23
V-ns
0.28
V-ns
L
EO
Parameter
Maximum undershoot area below VSS
DDR2-800
Maximum peak amplitude allowed for overshoot
CK, /CK
DDR2-533
Maximum undershoot area below VSS
DDR2-800, 667
DDR2-533
Maximum peak amplitude allowed for overshoot
DQ, DQS, /DQS,
Pr
UDQS, /UDQS,
LDQS, /LDQS,
RDQS, /RDQS,
DM, UDM, LDM
Maximum peak amplitude allowed for undershoot
Maximum overshoot area above VDDQ
DDR2-800, 667
DDR2-533
Maximum undershoot area below VSSQ
DDR2-800, 667
u
od
DDR2-533
Maximum amplitude
Overshoot area
Volts (V)
VDD, VDDQ
VSS, VSSQ
Undershoot area
Time (ns)
Overshoot/Undershoot Definition
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
7
EDE2508ACSE, EDE2516ACSE
DC Characteristics 1 (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V)
Parameter
Operating current
(ACT-PRE)
Symbol
IDD0
Grade
-8E
-6E
-5C
×8
×16
max.
max.
85
80
75
L
EO
Operating current
(ACT-READ-PRE)
Precharge powerdown standby
current
IDD1
-8E
-6E
-5C
IDD2P
90
85
80
Unit
85
80
75
mA
90
85
80
mA
11
11
mA
26
25
24
26
25
24
mA
IDD2Q
Idle standby current
IDD2N
-8E
-6E
-5C
30
28
26
30
28
26
mA
-8E
IDD3P-F -6E
-5C
45
40
35
45
40
35
mA
-8E
IDD3P-S -6E
-5C
27
22
17
all banks idle; tCK = tCK (IDD);
CKE is H, /CS is H;
Other control and address bus inputs are
STABLE;
Data bus inputs are FLOATING
all banks idle; tCK = tCK (IDD);
CKE is H, /CS is H;
Other control and address bus inputs are
SWITCHING;
Data bus inputs are SWITCHING
IDD3N
-8E
-6E
-5C
65
60
55
Operating current
(Burst read
operating)
IDD4R
-8E
-6E
-5C
120
105
90
Operating current
(Burst write
operating)
IDD4W
-8E
-6E
-5C
135
120
110
Fast PDN Exit
MRS(12) = 0
27
22
17
mA
65
60
55
mA
160
140
120
mA
180
160
140
mA
Preliminary Data Sheet E0948E30 (Ver. 3.0)
8
Slow PDN Exit
MRS(12) = 1
all banks open;
tCK = tCK (IDD), tRAS = tRAS max.(IDD),
tRP = tRP (IDD);
CKE is H, /CS is H between valid commands;
Other control and address bus inputs are
SWITCHING;
Data bus inputs are SWITCHING
all banks open, continuous burst reads,
IOUT = 0mA; BL = 4, CL = CL(IDD), AL = 0;
tCK = tCK (IDD),
tRAS = tRAS max.(IDD), tRP = tRP (IDD);
CKE is H, /CS is H between valid commands;
Address bus inputs are SWITCHING;
Data pattern is same as IDD4W
all banks open, continuous burst writes;
BL = 4, CL = CL(IDD), AL = 0;
tCK = tCK (IDD),
tRAS = tRAS max.(IDD), tRP = tRP (IDD);
CKE is H, /CS is H between valid commands;
Address bus inputs are SWITCHING;
Data bus inputs are SWITCHING
ct
Active standby
current
all banks open;
tCK = tCK (IDD);
CKE is L;
Other control and
address bus inputs
are STABLE;
Data bus inputs
are FLOATING
u
od
Active power-down
standby current
all banks idle; tCK = tCK (IDD); CKE is L;
Other control and address bus inputs are
STABLE;
Data bus inputs are FLOATING
Pr
Precharge quiet
standby current
-8E
-6E
-5C
Test condition
one bank; tCK = tCK (IDD), tRC = tRC (IDD),
tRAS = tRAS min.(IDD);
CKE is H, /CS is H between valid commands;
Address bus inputs are SWITCHING;
Data bus inputs are SWITCHING
one bank; IOUT = 0mA;
BL = 4, CL = CL(IDD), AL = 0;
tCK = tCK (IDD), tRC = tRC (IDD),
tRAS = tRAS min.(IDD); tRCD = tRCD (IDD);
CKE is H, /CS is H between valid commands;
Address bus inputs are SWITCHING;
Data pattern is same as IDD4W
EDE2508ACSE, EDE2516ACSE
Parameter
Symbol
Grade
-8E
-6E
-5C
Auto-refresh current IDD5
×8
×16
max.
max.
125
120
115
125
120
115
L
EO
Self-refresh current
Operating current
(Bank interleaving)
IDD6*
IDD7
7
10
-8E
-6E
-5C
175
165
155
10
190
180
170
Unit
Test condition
mA
tCK = tCK (IDD);
Refresh command at every tRFC (IDD)
interval;
CKE is H, /CS is H between valid commands;
Other control and address bus inputs are
SWITCHING;
Data bus inputs are SWITCHING
mA
Self-Refresh Mode;
CK and /CK at 0V; CKE ≤ 0.2V;
Other control and address bus inputs are
FLOATING;
Data bus inputs are FLOATING
mA
all bank interleaving reads, IOUT = 0mA;
BL = 4, CL = CL(IDD),
AL = tRCD (IDD) −1 × tCK (IDD);
tCK = tCK (IDD), tRC = tRC (IDD),
tRRD = tRRD(IDD), tRCD = 1 × tCK (IDD);
CKE is H, CS is H between valid commands;
Address bus inputs are STABLE during
DESELECTs; Data pattern is same as IDD4W
Notes: 1.
2.
3.
4.
u
od
Pr
IDD specifications are tested after the device is properly initialized.
Input slew rate is specified by AC Input Test Condition.
IDD parameters are specified with ODT disabled.
Data bus consists of DQ, DM, DQS, /DQS, RDQS and /RDQS. IDD values must be met with all
combinations of EMRS bits 10 and 11.
5. Definitions for IDD
L is defined as VIN ≤ VIL (AC) (max.)
H is defined as VIN ≥ VIH (AC) (min.)
STABLE is defined as inputs stable at an H or L level
FLOATING is defined as inputs at VREF = VDDQ/2
SWITCHING is defined as:
inputs changing between H and L every other clock cycle (once per two clocks) for address and control
signals, and inputs changing between H and L every other data transfer (once per clock) for DQ signals
not including masks or strobes.
6. Refer to AC Timing for IDD Test Conditions.
7. When TC ≥ +85°C, IDD6 must be derated by 80%.
IDD6 will increase by this amount, if TC ≥ +85°C and double refresh option is still enabled.
AC Timing for IDD Test Conditions
For purposes of IDD testing, the following parameters are to be utilized.
DDR2-800
DDR2-667
DDR2-533
ct
Parameter
5-5-5
5-5-5
4-4-4
CL (IDD)
5
5
4
tRCD (IDD)
12.5
15
15
tRC (IDD)
57.5
60
60
tRRD (IDD)
7.5
7.5
7.5
tCK (IDD)
2.5
3
3.75
tRAS (min.)(IDD)
45
45
45
ns
tRAS (max.)(IDD)
70000
70000
70000
ns
tRP (IDD)
12.5
15
15
ns
tRFC (IDD)
75
75
75
ns
Preliminary Data Sheet E0948E30 (Ver. 3.0)
9
Unit
tCK
ns
ns
ns
ns
EDE2508ACSE, EDE2516ACSE
DC Characteristics 2 (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V)
Parameter
Symbol
Value
Unit
Notes
Input leakage current
⏐ILI⏐
2
μA
VDD ≥ VIN ≥ VSS
Output leakage current
⏐ILO⏐
5
μA
VDDQ ≥ VOUT ≥ VSS
VTT + 0.603
V
5
VTT − 0.603
V
5
Output timing measurement reference level VOTR
0.5 × VDDQ
V
1
Output minimum sink DC current
IOL
+13.4
mA
3, 4, 5
Output minimum source DC current
IOH
−13.4
mA
2, 4, 5
L
EO
Minimum required output pull-up under AC
VOH
test load
Maximum required output pull-down under
VOL
AC test load
Notes: 1.
2.
3.
4.
5.
The VDDQ of the device under test is referenced.
VDDQ = 1.7V; VOUT = 1.42V.
VDDQ = 1.7V; VOUT = 0.28V.
The DC value of VREF applied to the receiving device is expected to be set to VTT.
After OCD calibration to 18Ω at TC = 25°C, VDD = VDDQ = 1.8V.
DC Characteristics 3 (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V)
Symbol
min.
max.
Unit
Notes
AC differential input voltage
VID (AC)
0.5
VDDQ + 0.6
V
1, 2
AC differential cross point voltage
VIX (AC)
0.5 × VDDQ − 0.175
0.5 × VDDQ + 0.175
V
2
AC differential cross point voltage
VOX (AC)
0.5 × VDDQ − 0.125
0.5 × VDDQ + 0.125
V
3
Pr
Parameter
u
od
Notes: 1. VID (AC) specifies the input differential voltage |VTR -VCP| required for switching, where VTR is the true
input signal (such as CK, DQS, RDQS) and VCP is the complementary input signal (such as /CK, /DQS,
/RDQS). The minimum value is equal to VIH (AC) − VIL (AC).
2. The typical value of VIX (AC) is expected to be about 0.5 × VDDQ of the transmitting device and VIX (AC)
is expected to track variations in VDDQ. VIX (AC) indicates the voltage at which differential input signals
must cross.
3. The typical value of VOX (AC) is expected to be about 0.5 × VDDQ of the transmitting device and VOX
(AC) is expected to track variations in VDDQ. VOX (AC) indicates the voltage at which differential output
signals must cross.
VDDQ
VTR
Crossing point
VID
VIX or VOX
VCP
Preliminary Data Sheet E0948E30 (Ver. 3.0)
10
ct
VSSQ
Differential Signal Levels*1, 2
EDE2508ACSE, EDE2516ACSE
ODT DC Electrical Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V)
Parameter
Symbol
min
typ
max
Unit
Note
Rtt effective impedance value for EMRS (A6, A2) = 0, 1; 75 Ω
Rtt1 (eff)
60
75
90
Ω
1
Rtt effective impedance value for EMRS (A6, A2) = 1, 0; 150 Ω
Rtt2 (eff)
120
150
180
Ω
1
Rtt effective impedance value for EMRS (A6, A2) = 1, 1; 50 Ω
Rtt3 (eff)
40
50
60
Ω
1
Deviation of VM with respect to VDDQ/2
ΔVM
−6
⎯
+6
%
1
Note: 1. Test condition for Rtt measurements.
L
EO
Measurement Definition for Rtt (eff)
Apply VIH (AC) and VIL (AC) to test pin separately, then measure current I(VIH(AC)) and I(VIL(AC)) respectively.
VIH(AC), and VDDQ values defined in SSTL_18.
Rtt (eff ) =
VIH ( AC ) − VIL( AC )
I (VIH ( AC )) − I (VIL( AC ))
Measurement Definition for ΔVM
Measure voltage (VM) at test pin (midpoint) with no load.
⎛ 2 × VM ⎞
- 1⎟ × 100
ΔVM = ⎜
⎝ VDDQ ⎠
OCD Default Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V)
Pr
Parameter
min
typ
max
Unit
Notes
12.6
18
23.4
Ω
1, 5
Pull-up and pull-down mismatch
0
⎯
4
Ω
1, 2
Output slew rate
1.5
⎯
5
V/ns
3, 4
Output impedance
ct
u
od
Notes: 1. Impedance measurement condition for output source DC current: VDDQ = 1.7V; VOUT = 1420mV;
(VOUT−VDDQ)/IOH must be less than 23.4Ω for values of VOUT between VDDQ and VDDQ−280mV.
Impedance measurement condition for output sink DC current: VDDQ = 1.7V; VOUT = 280mV;
VOUT/IOL must be less than 23.4Ω for values of VOUT between 0V and 280mV.
2. Mismatch is absolute value between pull up and pull down, both are measured at same temperature and
voltage.
3. Slew rate measured from VIL (AC) to VIH (AC).
4. The absolute value of the slew rate as measured from DC to DC is equal to or greater than the slew rate
as measured from AC to AC. This is guaranteed by design and characterization.
5. DRAM I/O specifications for timing, voltage, and slew rate are no longer applicable if OCD is changed
from default settings.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
11
EDE2508ACSE, EDE2516ACSE
Pin Capacitance (TA = 25°C, VDD, VDDQ = 1.8V ± 0.1V)
Parameter
Symbol
Pins
min.
max.
Unit
Notes
CLK input pin capacitance
CCK
CK, /CK
1.0
2.0
pF
1
1.0
1.75
pF
1
CIN
/RAS, /CAS,
/WE, /CS,
CKE, ODT,
Address
1.0
2.0
pF
1
2.5
3.5
pF
2
2.5
4.0
pF
2
Input pin capacitance
-8E
-6E, -5C
DQ, DQS, /DQS,
UDQS, /UDQS,
LDQS, /LDQS,
RDQS, /RDQS, DM,
UDM, LDM
L
EO
Input/output pin capacitance
-8E, -6E
CI/O
-5C
Notes: 1. Matching within 0.25pF.
2. Matching within 0.50pF.
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
12
EDE2508ACSE, EDE2516ACSE
AC Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V, VSS, VSSQ = 0V) [DDR2-800, 667]
• New units tCK(avg) and nCK, are introduced in DDR2-800 and DDR2-667
tCK(avg): actual tCK(avg) of the input clock under operation.
nCK: one clock cycle of the input clock, counting the actual clock edges.
Frequency (Mbps)
-8E
-6E
800
667
Parameter
Symbol
min.
max.
min.
max.
Unit
/CAS latency
CL
5
5
5
5
nCK
Notes
L
EO
tRCD
12.5
⎯
15
⎯
ns
Precharge command period
tRP
12.5
⎯
15
⎯
ns
Active to active/auto-refresh command time tRC
57.5
⎯
60
⎯
ns
DQ output access time from CK, /CK
tAC
−400
+400
−450
+450
ps
10
DQS output access time from CK, /CK
tDQSCK
−350
+350
−400
+400
ps
10
CK high-level width
tCH (avg) 0.48
0.52
0.48
0.52
tCK (avg) 13
CK low-level width
tCL(avg)
0.48
0.52
0.48
0.52
tCK (avg) 13
CK half period
tHP
Min. (tCL(abs),
⎯
tCH(abs))
Min.(tCL(abs),
⎯
tCH(abs))
ps
6, 13
Clock cycle time
tCK (avg)
2500
8000
3000
8000
ps
13
DQ and DM input hold time
tDH (base) 125
⎯
175
⎯
ps
5
DQ and DM input setup time
tDS (base) 50
⎯
100
⎯
ps
4
Control and Address input pulse width for
each input
tIPW
0.6
⎯
0.6
⎯
tCK (avg)
DQ and DM input pulse width for each input tDIPW
0.35
⎯
0.35
⎯
tCK (avg)
Data-out high-impedance time from CK,/CK tHZ
⎯
tAC max.
⎯
tAC max. ps
10
tAC max.
tAC min.
tAC max. ps
10
tAC max.
2 × tAC min.
tAC max. ps
10
Pr
Active to read or write command delay
DQS, /DQS low-impedance time from
CK,/CK
tLZ (DQS) tAC min.
DQ low-impedance time from CK,/CK
tLZ (DQ)
DQ hold skew factor
tQHS
DQ/DQS output hold time from DQS
tQH
DQS latching rising transitions to associated
tDQSS
clock edges
DQS input high pulse width
tDQSH
DQS input low pulse width
tDQSL
2 × tAC min.
u
od
DQS-DQ skew for DQS and associated DQ
tDQSQ
signals
⎯
200
⎯
240
ps
⎯
300
⎯
340
ps
7
tHP – tQHS
⎯
tHP – tQHS
⎯
ps
8
−0.25
+0.25
−0.25
+0.25
tCK (avg)
0.35
⎯
0.35
⎯
tCK (avg)
0.35
⎯
0.35
⎯
tCK (avg)
⎯
0.2
⎯
tCK (avg)
⎯
0.2
⎯
tCK (avg)
2
⎯
2
⎯
nCK
tWPST
0.4
0.6
0.4
tWPRE
0.35
⎯
0.35
Address and control input hold time
tIH (base) 250
⎯
275
Address and control input setup time
tIS (base) 175
⎯
200
Read preamble
tRPRE
0.9
1.1
0.9
Read postamble
tRPST
0.4
0.6
Active to precharge command
tRAS
45
Active to auto-precharge delay
tRAP
tRCD min.
Active bank A to active bank B command
period
tRRD
7.5
tDSS
DQS falling edge hold time from CK
tDSH
Mode register set command cycle time
tMRD
Write postamble
Write preamble
Preliminary Data Sheet E0948E30 (Ver. 3.0)
13
ct
0.2
0.2
DQS falling edge to CK setup time
0.6
tCK (avg)
⎯
tCK (avg)
⎯
ps
5
⎯
ps
4
1.1
tCK (avg) 11
0.4
0.6
tCK (avg) 12
70000
45
70000
ns
⎯
tRCD min.
⎯
ns
⎯
7.5
⎯
ns
EDE2508ACSE, EDE2516ACSE
Frequency (Mbps)
Parameter
Symbol
/CAS to /CAS command delay
Write recovery time
-8E
-6E
800
667
max.
min.
max.
Unit
tCCD
2
⎯
2
⎯
nCK
tWR
15
⎯
15
⎯
ns
Auto precharge write recovery + precharge
time
tDAL
WR + RU
⎯
(tRP/tCK(avg))
Internal write to read command delay
tWTR
7.5
⎯
7.5
⎯
ns
Internal read to precharge command delay
tRTP
7.5
⎯
7.5
⎯
ns
L
EO
min.
WR + RU
⎯
(tRP/tCK(avg))
nCK
Notes
1, 9
Exit self-refresh to a non-read command
tXSNR
tRFC + 10
⎯
tRFC + 10
⎯
ns
Exit self-refresh to a read command
tXSRD
200
⎯
200
⎯
nCK
Exit precharge power-down to any non-read
tXP
command
2
⎯
2
⎯
nCK
Exit active power-down to read command
tXARD
2
⎯
2
⎯
nCK
3
tXARDS
8 − AL
⎯
7 − AL
⎯
nCK
2, 3
tCKE
3
⎯
3
⎯
nCK
Output impedance test driver delay
tOIT
0
12
0
12
ns
MRS command to ODT update delay
tMOD
0
12
0
12
ns
tRFC
75
⎯
75
⎯
ns
tREFI
⎯
7.8
⎯
7.8
μs
tREFI
⎯
3.9
⎯
3.9
μs
Exit active power-down to read command
(slow exit/low power mode)
CKE minimum pulse width (high and low
pulse width)
(+85°C < TC ≤ +95°C)
Pr
Auto-refresh to active/auto-refresh
command time
Average periodic refresh interval
(0°C ≤ TC ≤ +85°C)
Minimum time clocks remains ON after CKE
tDELAY
asynchronously drops low
tIS + tCK(avg)
⎯
+ tIH
tIS + tCK(avg)
⎯
+ tIH
ns
ct
u
od
Preliminary Data Sheet E0948E30 (Ver. 3.0)
14
EDE2508ACSE, EDE2516ACSE
AC Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V, VSS, VSSQ = 0V) [DDR2-533]
-5C
Frequency (Mbps)
533
Parameter
Symbol
min.
max.
Unit
CL
4
5
tCK
Active to read or write command delay
tRCD
15
⎯
ns
Precharge command period
tRP
15
⎯
ns
Active to active/auto-refresh command time
tRC
60
⎯
ns
DQ output access time from CK, /CK
tAC
−500
+500
ps
DQS output access time from CK, /CK
tDQSCK
−450
+450
ps
CK high-level width
tCH
0.45
0.55
tCK
CK low-level width
tCL
0.45
0.55
tCK
CK half period
tHP
Min.
(tCL, tCH)
⎯
ps
Clock cycle time
tCK
3750
8000
ps
tDH (base)
225
⎯
ps
tDH1 (base)
–25
⎯
ps
tDS (base)
100
⎯
ps
tDS1 (base)
–25
⎯
ps
Control and Address input pulse width for each input
tIPW
0.6
⎯
tCK
DQ and DM input pulse width for each input
tDIPW
0.35
⎯
tCK
Data-out high-impedance time from CK,/CK
tHZ
⎯
tAC max.
ps
Data-out low-impedance time from CK,/CK
tLZ
tAC min.
tAC max.
ps
DQS-DQ skew for DQS and associated DQ signals
tDQSQ
⎯
300
ps
tQHS
⎯
400
ps
tQH
tHP – tQHS
⎯
ps
DQS latching rising transitions to associated clock edges tDQSS
−0.25
+0.25
tCK
DQS input high pulse width
tDQSH
0.35
⎯
tCK
tDQSL
0.35
⎯
tCK
tDSS
0.2
⎯
tCK
L
EO
/CAS latency
DQ hold skew factor
DQ/DQS output hold time from DQS
DQS input low pulse width
DQS falling edge to CK setup time
0.2
⎯
tCK
2
⎯
tCK
tWPST
0.4
0.6
tCK
Write preamble
tWPRE
0.35
⎯
tCK
Address and control input hold time
tIH (base)
375
⎯
Address and control input setup time
tIS (base)
250
⎯
Mode register set command cycle time
Write postamble
4
ct
tDSH
tMRD
DQS falling edge hold time from CK
5
u
od
Pr
DQ and DM input hold time
(differential strobe)
DQ and DM input hold time
(single-ended strobe)
DQ and DM input setup time
(differential strobe)
DQ and DM input setup time
(single-ended strobe)
Notes
ps
5
ps
4
Read preamble
tRPRE
0.9
1.1
tCK
Read postamble
tRPST
0.4
0.6
tCK
Active to precharge command
tRAS
45
70000
ns
Active to auto-precharge delay
tRAP
tRCD min.
⎯
ns
Active bank A to active bank B command period
tRRD
7.5
⎯
ns
/CAS to /CAS command delay
tCCD
2
⎯
tCK
Write recovery time
tWR
15
⎯
ns
Preliminary Data Sheet E0948E30 (Ver. 3.0)
15
EDE2508ACSE, EDE2516ACSE
-5C
Frequency (Mbps)
533
Parameter
min.
max.
Unit
Notes
Auto precharge write recovery + precharge time
tDAL
WR +
RU(tRP/tCK)
⎯
tCK
1, 9
Internal write to read command delay
tWTR
7.5
⎯
ns
Internal read to precharge command delay
tRTP
7.5
⎯
ns
Exit self-refresh to a non-read command
tXSNR
tRFC + 10
⎯
ns
Exit self-refresh to a read command
tXSRD
200
⎯
tCK
Exit precharge power-down to any non-read command
tXP
2
⎯
tCK
Exit active power-down to read command
tXARD
2
⎯
tCK
3
Exit active power-down to read command
(slow exit/low power mode)
tXARDS
6 − AL
⎯
tCK
2, 3
CKE minimum pulse width (high and low pulse width)
tCKE
3
⎯
tCK
Output impedance test driver delay
tOIT
0
12
ns
MRS command to ODT update delay
tMOD
0
12
ns
Auto-refresh to active/auto-refresh command time
tRFC
75
⎯
ns
Average periodic refresh interval
(0°C ≤ TC ≤ +85°C)
tREFI
⎯
7.8
μs
tREFI
⎯
3.9
μs
tDELAY
tIS + tCK + tIH
⎯
ns
L
EO
Symbol
(+85°C < TC ≤ +95°C)
Minimum time clocks remains ON after CKE
asynchronously drops low
Pr
Notes: 1.
2.
3.
4.
u
od
For each of the terms above, if not already an integer, round to the next higher integer.
AL: Additive Latency.
MRS A12 bit defines which active power-down exit timing to be applied.
The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the
VIH(AC) level for a rising signal and VIL(AC) for a falling signal applied to the device under test.
5. The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the
VIH(DC) level for a rising signal and VIL(DC) for a falling signal applied to the device under test.
CK
DQS
/CK
/DQS
tIS
tDS
tDH
tDS
tDH
tIH
tIS
tIH
VDDQ
VIH (AC)(min.)
VIH (DC)(min.)
VREF
VIL (DC)(max.)
VIL (AC)(max.)
VSS
ct
VDDQ
VIH (AC)(min.)
VIH (DC)(min.)
VREF
VIL (DC)(max.)
VIL (AC)(max.)
VSS
Input Waveform Timing 1 (tDS, tDH)
Input Waveform Timing 2 (tIS, tIH)
Preliminary Data Sheet E0948E30 (Ver. 3.0)
16
EDE2508ACSE, EDE2516ACSE
L
EO
6. tHP is the minimum of the absolute half period of the actual input clock. tHP is an input parameter but not
an input specification parameter. It is used in conjunction with tQHS to derive the DRAM output timing
tQH.
The value to be used for tQH calculation is determined by the following equation;
tHP = min ( tCH(abs), tCL(abs) ),
where,
tCH(abs) is the minimum of the actual instantaneous clock high time;
tCL(abs) is the minimum of the actual instantaneous clock low time;
7. tQHS accounts for:
a. The pulse duration distortion of on-chip clock circuits, which represents how well the actual tHP at the
input is transferred to the output; and
b. The worst case push-out of DQS on one transition followed by the worst case pull-in of DQ on the
next transition, both of which are independent of each other, due to data pin skew, output pattern effects,
and p-channel to n-channel variation of the output drivers.
8. tQH = tHP – tQHS, where:
tHP is the minimum of the absolute half period of the actual input clock; and tQHS is the specification
value under the max column.
{The less half-pulse width distortion present, the larger the tQH value is; and the larger the valid data eye
will be.}
Examples:
a. If the system provides tHP of 1315ps into a DDR2-667 SDRAM, the DRAM provides tQH of 975ps
(min.)
b. If the system provides tHP of 1420ps into a DDR2-667 SDRAM, the DRAM provides tQH of 1080ps
(min.)
9. RU stands for round up. WR refers to the tWR parameter stored in the MRS.
10. When the device is operated with input clock jitter, this parameter needs to be derated by the actual
tERR(6-10per) of the input clock. (output deratings are relative to the SDRAM input clock.)
For example, if the measured jitter into a DDR2-667 SDRAM has tERR(6-10per) min. = −272ps and
tERR(6-10per) max. = +293ps, then tDQSCK min.(derated) = tDQSCK min. − tERR(6-10per) max. =
−400ps − 293ps = −693ps and tDQSCK max.(derated) = tDQSCK max. − tERR(6-10per) min. = 400ps +
272ps = +672ps. Similarly, tLZ(DQ) for DDR2-667 derates to tLZ(DQ) min.(derated) = −900ps − 293ps =
−1193ps and tLZ(DQ) max.(derated)= 450ps + 272ps = +722ps.
11. When the device is operated with input clock jitter, this parameter needs to be derated by the actual
tJIT(per) of the input clock. (output deratings are relative to the SDRAM input clock.)
For example, if the measured jitter into a DDR2-667 SDRAM has tJIT(per) min. = −72ps and
tJIT(per) max. = +93ps, then tRPRE min.(derated) = tRPRE min. + tJIT(per) min. = 0.9 × tCK(avg) − 72ps
= +2178ps and tRPRE max.(derated) = tRPRE max. + tJIT(per) max. = 1.1 × tCK(avg) + 93ps = +2843ps.
12. When the device is operated with input clock jitter, this parameter needs to be derated by the actual
tJIT(duty) of the input clock. (output deratings are relative to the SDRAM input clock.)
For example, if the measured jitter into a DDR2-667 SDRAM has tJIT(duty) min. = −72ps and
tJIT(duty) max. = +93ps, then tRPST min.(derated) = tRPST min. + tJIT(duty) min. = 0.4 × tCK(avg) −
72ps = +928ps and tRPST max.(derated) = tRPST max. + tJIT(duty) max. = 0.6 × tCK(avg) + 93ps =
+1592ps.
13. Refer to the Clock Jitter table.
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
17
EDE2508ACSE, EDE2516ACSE
ODT AC Electrical Characteristics
Parameter
Symbol
min
max
Unit
Notes
ODT turn-on delay
tAOND
2
2
tCK
ODT turn-on
-8E, -6E
tAON
tAC (min)
tAC (max) + 700
ps
1, 3
1
tAON
tAC (min)
tAC (max) + 1000
ps
ODT turn-on (power-down mode)
tAONPD
tAC(min) + 2000
2tCK + tAC(max) + 1000
ps
ODT turn-off delay
tAOFD
2.5
2.5
tCK
5, 6
2, 4, 5, 6
-5C
L
EO
ODT turn-off
tAOF
tAC(min)
tAC(max) + 600
ps
ODT turn-off (power-down mode)
tAOFPD
tAC(min) + 2000
2.5tCK + tAC(max) + 1000
ps
ODT to power-down entry latency
tANPD
3
3
tCK
ODT power-down exit latency
tAXPD
8
8
tCK
ct
u
od
Pr
Notes: 1. ODT turn on time min is when the device leaves high impedance and ODT resistance begins to turn on.
ODT turn on time max is when the ODT resistance is fully on. Both are measured from tAOND.
2. ODT turn off time min is when the device starts to turn off ODT resistance.
ODT turn off time max is when the bus is in high impedance. Both are measured from tAOFD.
3. When the device is operated with input clock jitter, this parameter needs to be derated by the actual
tERR(6-10per) of the input clock. (output deratings are relative to the SDRAM input clock.)
4. When the device is operated with input clock jitter, this parameter needs to be derated by
{−tJIT(duty) max. − tERR(6-10per) max. } and { −tJIT(duty) min. − tERR(6-10per) min. } of the actual input
clock.(output deratings are relative to the SDRAM input clock.)
For example, if the measured jitter into a DDR2-667 SDRAM has tERR(6-10per) min. = −272ps,
tERR(6-10per) max. = +293ps, tJIT(duty) min. = −106ps and tJIT(duty) max. = +94ps, then
tAOF min.(derated) = tAOF min. + { −tJIT(duty) max. − tERR(6-10per) max. } = −450ps + { −94ps − 293ps}
= −837ps and tAOF max.(derated) = tAOF max. + { −tJIT(duty) min. − tERR(6-10per) min. } = 1050ps +
{ 106ps + 272ps} = +1428ps.
5. For tAOFD of DDR2-533, the 1/2 clock of tCK in the 2.5 × tCK assumes a tCH, input clock high pulse
width of 0.5 relative to tCK. tAOF min. and tAOF max. should each be derated by the same amount as
the actual amount of tCH offset present at the DRAM input with respect to 0.5. For example, if an input
clock has a worst case tCH of 0.45, the tAOF min. should be derated by subtracting 0.05 × tCK from it,
whereas if an input clock has a worst case tCH of 0.55, the tAOF max. should be derated by adding 0.05
× tCK to it. Therefore, we have;
tAOF min.(derated) = tAC min. − [0.5 − Min.(0.5, tCH min.)] × tCK
tAOF max.(derated) = tAC max. + 0.6 + [Max.(0.5, tCH max.) − 0.5] × tCK
or
tAOF min.(derated) = Min.(tAC min., tAC min. − [0.5 − tCH min.] × tCK)
tAOF max.(derated) = 0.6 + Max.(tAC max., tAC max. + [tCH max. − 0.5] × tCK)
where tCH min. and tCH max. are the minimum and maximum of tCH actually measured at the DRAM
input balls.
6. For tAOFD of DDR2-667/800, the 1/2 clock of nCK in the 2.5 × nCK assumes a tCH(avg), average input
clock high pulse width of 0.5 relative to tCK(avg). tAOF min. and tAOF max. should each be derated by
the same amount as the actual amount of tCH(avg) offset present at the DRAM input with respect to 0.5.
For example, if an input clock has a worst case tCH(avg) of 0.48, the tAOF min. should be derated by
subtracting 0.02 × tCK(avg) from it, whereas if an input clock has a worst case tCH(avg) of 0.52,
the tAOF max. should be derated by adding 0.02 × tCK(avg) to it. Therefore, we have;
tAOF min.(derated) = tAC min. − [0.5 − Min.(0.5, tCH(avg) min.)] × tCK(avg)
tAOF max.(derated) = tAC max. + 0.6 + [Max.(0.5, tCH(avg) max.) − 0.5] × tCK(avg)
or
tAOF min.(derated) = Min.(tAC min., tAC min. − [0.5 − tCH(avg) min.] × tCK(avg))
tAOF max.(derated) = 0.6 + Max.(tAC max., tAC max. + [tCH(avg) max. − 0.5] × tCK(avg))
where tCH(avg) min. and tCH(avg) max. are the minimum and maximum of tCH(avg) actually measured
at the DRAM input balls.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
18
EDE2508ACSE, EDE2516ACSE
AC Input Test Conditions
Parameter
Symbol
Value
Unit
Notes
Input reference voltage
VREF
0.5 × VDDQ
V
1
Input signal maximum peak to peak swing
VSWING (max.)
1.0
V
1
Input signal minimum slew rate
SLEW
1.0
V/ns
2, 3
L
EO
Notes: 1. Input waveform timing is referenced to the input signal crossing through the VIH/IL (AC) level applied to
the device under test.
2. The input signal minimum slew rate is to be maintained over the range from VREF to VIH (AC) min. for
rising edges and the range from VREF to VIL (AC) max. for falling edges as shown in the below figure.
3. AC timings are referenced with input waveforms switching from VIL (AC) to VIH (AC) on the positive
transitions and VIH (AC) to VIL (AC) on the negative transitions.
VDDQ
VIH (AC)(min.)
VIH (DC)(min.)
VSWING(max.)
VREF
VIL (DC)(max.)
VIL (AC)(max.)
− VIL (AC)(max.)
Pr
VREF
VSS
ΔTR
ΔTF
Falling slew =
Rising slew =
ΔTF
VIH (AC) min. − VREF
ΔTR
AC Input Test Signal Wave forms
Measurement point
u
od
DQ
VTT
RT =25 Ω
Output Load
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
19
EDE2508ACSE, EDE2516ACSE
Clock Jitter [DDR2-800, 667]
Frequency (Mbps)
-8E
-6E
800
667
Parameter
Symbol
min.
max.
min.
max.
Unit
Notes
Average clock period
tCK (avg)
2500
8000
3000
8000
ps
1
Clock period jitter
tJIT (per)
−100
100
−125
125
ps
5
Clock period jitter during
DLL locking period
tJIT
(per, lck)
−80
80
−100
100
ps
5
tJIT (cc)
⎯
200
⎯
250
ps
6
Cycle to cycle clock period jitter
during DLL locking period
tJIT (cc, lck) ⎯
160
⎯
200
ps
6
Cumulative error across 2 cycles
tERR (2per) −150
150
−175
175
ps
7
Cumulative error across 3 cycles
tERR (3per) −175
175
−225
225
ps
7
Cumulative error across 4 cycles
tERR (4per) −200
200
−250
250
ps
7
Cumulative error across 5 cycles
tERR (5per) −200
200
−250
250
ps
7
Cumulative error across
n=6,7,8,9,10 cycles
Cumulative error across
n=11, 12,…49,50 cycles
tERR
(6-10per)
tERR
(11-50per)
−300
300
−350
350
ps
7
−450
450
−450
450
ps
7
Average high pulse width
tCH (avg)
0.48
0.52
0.48
0.52
tCK (avg)
2
Average low pulse width
tCL (avg)
0.48
0.52
0.48
0.52
tCK (avg)
3
Duty cycle jitter
tJIT (duty)
−100
100
−125
125
ps
4
L
EO
Cycle to cycle period jitter
Pr
Notes: 1. tCK (avg) is calculated as the average clock period across any consecutive 200cycle window.
⎧N
⎫
tCK (avg ) = ⎨∑ tCKj ⎬ N
⎩ j =1
⎭
u
od
N = 200
2. tCH (avg) is defined as the average high pulse width, as calculated across any consecutive 200 high
pulses.
⎧N
⎫
tCH (avg ) = ⎨∑ tCHj ⎬ (N × tCK (avg ))
⎩ j =1
⎭
N = 200
3. tCL (avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.
⎧N
⎫
tCL(avg ) = ⎨∑ tCLj ⎬ (N × tCK (avg ))
⎩ j =1
⎭
ct
N = 200
4. tJIT (duty) is defined as the cumulative set of tCH jitter and tCL jitter. tCH jitter is the largest deviation of
any single tCH from tCH (avg). tCL jitter is the largest deviation of any single tCL from tCL (avg).
tJIT (duty) is not subject to production test.
tJIT (duty) = Min./Max. of {tJIT (CH), tJIT (CL)}, where:
tJIT (CH) = {tCHj- tCH (avg) where j = 1 to 200}
tJIT (CL) = {tCLj − tCL (avg) where j = 1 to 200}
5. tJIT (per) is defined as the largest deviation of any single tCK from tCK (avg).
tJIT (per) = Min./Max. of { tCKj − tCK (avg) where j = 1 to 200}
tJIT (per) defines the single period jitter when the DLL is already locked. tJIT (per, lck) uses the same
definition for single period jitter, during the DLL locking period only. tJIT (per) and tJIT (per, lck) are not
subject to production test.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
20
EDE2508ACSE, EDE2516ACSE
6. tJIT (cc) is defined as the absolute difference in clock period between two consecutive clock cycles:
tJIT (cc) = Max. of |tCKj+1 − tCKj|
tJIT (cc) is defines the cycle to cycle jitter when the DLL is already locked. tJIT (cc, lck) uses the same
definition for cycle to cycle jitter, during the DLL locking period only. tJIT (cc) and tJIT (cc, lck) are not
subject to production test.
7. tERR (nper) is defined as the cumulative error across multiple consecutive cycles from tCK (avg).
tERR (nper) is not subject to production test.
L
EO
⎧n
⎫
tERR(nper ) = ⎨∑ tCKj ⎬ − n × tCK(avg ))
⎩ j =1
⎭
2 ≤ n ≤ 50 for tERR (nper)
8. These parameters are specified per their average values, however it is understood that the following
relationship between the average timing and the absolute instantaneous timing hold at all times.
(minimum and maximum of spec values are to be used for calculations in the table below.)
Parameter
Symbol
min.
max.
Absolute clock period
tCK (abs)
tCK (avg) min. + tJIT (per) min.
tCK (avg) max. + tJIT (per) max. ps
tCH (avg) min. × tCK (avg) min. +
tJIT (duty) min.
tCL (avg) min. × tCK (avg) min. +
tJIT (duty) min.
tCH (avg) max. × tCK (avg) max.
ps
+ tJIT (duty) max.
tCL (avg) max. × tCK (avg) max.
ps
+ tJIT (duty) max.
Absolute clock high pulse
width
Absolute clock low pulse
width
tCH (abs)
tCL (abs)
Unit
Example: For DDR2-667, tCH(abs) min. = ( 0.48 × 3000 ps ) - 125ps = 1315ps
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
21
EDE2508ACSE, EDE2516ACSE
Input Slew Rate Derating
For all input signals the total tIS, tDS (setup time) and tIH, tDH (hold time) required is calculated by adding the data
sheet tIS (base), tDS (base) and tIH (base), tDH (base) value to the ΔtIS, ΔtDS and ΔtIH, ΔtDH derating value
respectively.
Example: tDS (total setup time) = tDS (base) + ΔtDS.
L
EO
Setup (tIS, tDS) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of VREF
(DC) and the first crossing of VIH (AC) min. Setup (tIS, tDS) nominal slew rate for a falling signal is defined as the
slew rate between the last crossing of VREF (DC) and the first crossing of VIL (AC) max. If the actual signal is
always earlier than the nominal slew rate line between shaded ‘VREF (DC) to AC region’, use nominal slew rate for
derating value (See the figure of Slew Rate Definition Nominal).
If the actual signal is later than the nominal slew rate line anywhere between shaded ‘VREF (DC) to AC region’, the
slew rate of a tangent line to the actual signal from the AC level to DC level is used for derating value (see the figure
of Slew Rate Definition Tangent).
Hold (tIH, tDH) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of
VIL (DC) max. and the first crossing of VREF (DC). Hold (tIH, tDH) nominal slew rate for a falling signal is defined
as the slew rate between the last crossing of VIH (DC) min. and the first crossing of VREF (DC). If the actual signal
is always later than the nominal slew rate line between shaded ‘DC level to VREF (DC) region’, use nominal slew
rate for derating value (See the figure of Slew Rate Definition Nominal).
If the actual signal is earlier than the nominal slew rate line anywhere between shaded ‘DC to VREF (DC) region’,
the slew rate of a tangent line to the actual signal from the DC level to VREF (DC) level is used for derating value
(see the figure of Slew Rate Definition Tangent).
Pr
Although for slow slew rates the total setup time might be negative (i.e. a valid input signal will not have reached
VIH/IL (AC) at the time of the rising clock transition) a valid input signal is still required to complete the transition and
reach VIH/IL (AC).
For slew rates in between the values listed in the tables below, the derating values may obtained by linear
interpolation.
These values are typically not subject to production test. They are verified by design and characterization.
u
od
[Derating Values of tDS/tDH with Differential DQS (DDR2-533)]
DQS, /DQS differential slew rate
4.0 V/ns
3.0 V/ns
2.0 V/ns
1.8 V/ns
1.6 V/ns
1.4 V/ns
1.2 V/ns
1.0 V/ns
0.8 V/ns
ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH Unit
+125 +45
+125 +45
+125 +45
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.5
+83
+21
+83
+21
+83
+21
+95
+33
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.0
0
0
0
0
0
0
+12
+12
+24
+24
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
0.9
⎯
⎯
−11
−14
−11
−14
+1
−2
+13
+10
+25
+22
⎯
⎯
⎯
⎯
⎯
⎯
ps
0.8
⎯
⎯
⎯
⎯
−25
−31
−13
−19
−1
−7
11
+5
+23
+17
⎯
⎯
⎯
⎯
ps
0.7
⎯
⎯
⎯
⎯
⎯
⎯
−31
−42
−19
−30
−7
−18
+5
−6
+17
+6
⎯
⎯
ps
0.6
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−43
−59
−31
−47
−19
−35
−7
−23
+5
−11
ps
0.5
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−74
−89
−62
−77
−50
−65
−38
−53
ps
0.4
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−127 −140 −115 −128 −103 −116 ps
Preliminary Data Sheet E0948E30 (Ver. 3.0)
22
ct
DQ
slew
rate
(V/ns)
2.0
EDE2508ACSE, EDE2516ACSE
[Derating Values of tDS/tDH with Differential DQS (DDR2-667, 800)
DQS, /DQS differential slew rate
4.0 V/ns
3.0 V/ns
2.0 V/ns
1.8 V/ns
1.6 V/ns
1.4 V/ns
1.2 V/ns
1.0 V/ns
0.8 V/ns
ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH ΔtDS ΔtDH Unit
+100 +45
+100 +45
+100 +45
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.5
+67
+21
+67
+21
+67
+21
+79
+33
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.0
0
0
0
0
0
0
+12
+12
+24
+24
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
0.9
⎯
⎯
−5
−14
−5
−14
+7
−2
+19
+10
+31
+22
⎯
⎯
⎯
⎯
⎯
⎯
ps
0.8
⎯
⎯
⎯
⎯
−13
−31
−1
−19
+11
−7
+23
+5
+35
+17
⎯
⎯
⎯
⎯
ps
0.7
⎯
⎯
⎯
⎯
⎯
⎯
−10
−42
+2
−30
+14
−18
+26
−6
+38
+6
⎯
⎯
ps
0.6
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−10
−59
+2
−47
+14
−35
+26
−23
+38
−11
ps
0.5
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−24
−89
−12
−77
0
−65
+12
−53
ps
0.4
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−52
−140 −40
L
EO
DQ
slew
rate
(V/ns)
2.0
−128 −28
−116 ps
[Derating Values of tDS1/tDH1 with Single-Ended DQS (DDR2-533)]
DQS, /DQS single-ended slew rate
2.0 V/ns
1.5 V/ns
1.0V/ns
0.9V/ns
0.8V/ns
0.7 V/ns
0.6 V/ns
0.5 V/ns
0.4 V/ns
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Unit
tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1 tDS1 tDH1
+188 +188 +167 +146 +125 +63
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.5
+146 +167 +125 +125 +83
+42
+81
+43
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
1.0
+63
+125 +42
0.9
⎯
⎯
+31
0.8
⎯
⎯
⎯
0.7
⎯
⎯
⎯
0.6
⎯
⎯
⎯
0.5
⎯
⎯
⎯
0.4
⎯
⎯
⎯
Pr
DQ
slew
rate
(V/ns)
2.0
0
0
−2
+1
−7
−13
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ps
+69
−11
−14
−13
−13
−18
−27
−29
−45
⎯
⎯
⎯
⎯
⎯
⎯
ps
⎯
−25
−31
−27
−30
−32
−44
−43
−62
−60
−86
⎯
⎯
⎯
⎯
ps
⎯
⎯
⎯
−45
−53
−50
−67
−61
−85
−78
−109 −108 −152 ⎯
⎯
ps
⎯
⎯
⎯
⎯
⎯
−74
−96
−85
−114 −102 −138 −132 −181 −183 −246 ps
⎯
⎯
⎯
⎯
⎯
⎯
⎯
−128 −156 −145 −180 −175 −223 −226 −288 ps
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
u
od
+83
⎯
−210 −243 −240 −286 −291 −351 ps
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
23
EDE2508ACSE, EDE2516ACSE
[Derating Values of tIS/tIH (DDR2-533)]
CK, /CK Differential Slew Rate
2.0 V/ns
1.5 V/ns
ΔtIS
ΔtIH
ΔtIS
ΔtIH
ΔtIS
ΔtIH
Unit Notes
4.0
+187
+94
+217
+124
+247
+154
ps
3.5
+179
+89
+209
+119
+239
+149
ps
3.0
+167
+83
+197
+113
+227
+143
ps
2.5
+150
+75
+180
+105
+210
+135
ps
2.0
+125
+45
+155
+75
+185
+105
ps
1.5
+83
+21
+113
+51
+143
+81
ps
L
EO
Command/address
slew rate (V/ns)
1.0 V/ns
1.0
0
0
+30
+30
+60
60
ps
0.9
−11
−14
+19
+16
+49
+46
ps
0.8
−25
−31
+5
−1
+35
+29
ps
0.7
−43
−54
−13
−24
+17
+6
ps
0.6
−67
−83
−37
−53
−7
−23
ps
0.5
−110
−125
−80
−95
−50
−65
ps
0.4
−175
−188
−145
−158
−115
−128
ps
0.3
−285
−292
−255
−262
−225
−232
ps
0.25
−350
−375
−320
−345
−290
−315
ps
0.2
−525
−500
−495
−470
0.1
−465
−440
ps
−800
−708
−770
−678
−740
−648
ps
−1450
−1125
−1420
−1095
−1390
−1065
ps
ct
u
od
Pr
0.15
Preliminary Data Sheet E0948E30 (Ver. 3.0)
24
EDE2508ACSE, EDE2516ACSE
[Derating Values of tIS/tIH (DDR2-667, DDR2-800)]
CK, /CK Differential Slew Rate
2.0 V/ns
1.5 V/ns
ΔtIS
ΔtIH
ΔtIS
ΔtIH
ΔtIS
ΔtIH
Unit
4.0
+150
+94
+180
+124
+210
+154
ps
3.5
+143
+89
+173
+119
+203
+149
ps
3.0
+133
+83
+163
+113
+193
+143
ps
2.5
+120
+75
+150
+105
+180
+135
ps
2.0
+100
+45
+130
+75
+160
+105
ps
1.5
+67
+21
+97
+51
+127
+81
ps
L
EO
Command/address
slew rate (V/ns)
1.0 V/ns
1.0
0
0
+30
+30
+60
+60
ps
0.9
−5
−14
+25
+16
+55
+46
ps
0.8
−13
−31
+17
−1
+47
+29
ps
0.7
−22
−54
+8
−24
+38
+6
ps
0.6
−34
−83
−4
−53
+26
−23
ps
0.5
−60
−125
−30
−95
0
−65
ps
0.4
−100
−188
−70
−158
−40
−128
ps
0.3
−168
−292
−138
−262
−108
−232
ps
0.25
−200
−375
−170
−345
−140
−315
ps
0.2
−325
−500
−295
−470
0.1
−265
−440
ps
−517
−708
−487
−678
−457
−648
ps
−1000
−1125
−970
−1095
−940
−1065
ps
ct
u
od
Pr
0.15
Notes
Preliminary Data Sheet E0948E30 (Ver. 3.0)
25
EDE2508ACSE, EDE2516ACSE
Single-ended DQS
DQS
VDDQ
VIH (AC) min.
VIH (DC) min.
VREF (DC)
VIL (DC) max.
VIL (AC) max.
VSS
Differential DQS, /DQS
CK, /CK
DQS
CK
tDS1
tDH1
tDS1
tDH1
L
EO
/DQS
/CK
tDS
tIS
tDH
tIH
tDS
tIS
tDH
tIH
VDD
VIH (AC) min.
VREF to AC
region
Pr
VIH (DC) min.
VREF (DC)
DC to VREF
region
nominal
slew rate
u
od
VIL (DC) max.
VREF to AC
region
VIL (AC) max.
VSS
ΔTRH ΔTRS
VREF (DC) - VIL (AC) max.
Setup slew rate
=
Falling signal
ΔTFS
=
ΔTFH
ct
ΔTFS
Hold slew rate
Rising signal
nominal
slew rate
DC to VREF
region
VIH (AC) min. - VREF (DC)
Setup slew rate
=
Rising signal
ΔTRS
VREF (DC) - VIL (DC) max.
Hold slew rate
Falling signal
ΔTRH
Slew Rate Definition Nominal
Preliminary Data Sheet E0948E30 (Ver. 3.0)
26
=
VIH (DC) min. - VREF (DC)
ΔTFH
EDE2508ACSE, EDE2516ACSE
Single-ended DQS
DQS
VDDQ
VIH (AC) min.
VIH (DC) min.
VREF (DC)
VIL (DC) max.
VIL (AC) max.
VSS
Differential DQS, /DQS
CK, /CK
DQS
CK
tDS1
tDH1
L
EO
tDS1
tDH1
tDS
tIS
tDH
tIH
/DQS
/CK
tDS
tIS
tDH
tIH
VDD
VIH (AC) min.
VREF to AC
region
nominal
line
nominal
line
Pr
VIH (DC) min.
VREF (DC)
DC to VREF
region
tangent
line
VIL (DC) max.
VREF to AC
region
nominal
line
VIL (AC) max.
VSS
ΔTFS
ΔTRH
=
ΔTRS
ΔTFH
ct
tangent line [VREF (DC) - VIL (AC) max.]
Setup slew rate
=
Falling signal
ΔTFS
Hold slew rate
Rising signal
DC to VREF
region
u
od
nominal
line
tangent
line
tangent line [VIH (AC) min. - VREF (DC)]
Setup slew rate
=
Rising signal
ΔTRS
tangent line [VREF (DC) - VIL (DC) max.]
Hold slew rate
Falling signal
ΔTRH
Slew Rate Definition Tangent
Preliminary Data Sheet E0948E30 (Ver. 3.0)
27
=
tangent line [VIH (DC) min. - VREF (DC)]
ΔTFH
EDE2508ACSE, EDE2516ACSE
Clock
generator
Block Diagram
Bank 3
Bank 2
Bank 1
L
EO
A0 to A12, BA0, BA1
Control logic
/CS
/RAS
/CAS
/WE
Command decoder
Mode
register
Row
address
buffer
and
refresh
counter
Row decoder
CK
/CK
CKE
Memory cell array
Bank 0
Sense amp.
Column decoder
Column
address
buffer
and
burst
counter
Data control circuit
Pr
Latch circuit
CK, /CK
DLL
Input & Output buffer
DQS, /DQS
RDQS, /RDQS
ODT
DM
u
od
DQ
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
28
EDE2508ACSE, EDE2516ACSE
Pin Function
CK, /CK (input pins)
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 (read) data is referenced to the crossings of CK and /CK
(both directions of crossing).
/CS (input pin)
All commands are masked when /CS is registered high. /CS provides for external rank selection on systems with
multiple ranks. /CS is considered part of the command code.
L
EO
/RAS, /CAS, /WE (input pins)
/RAS, /CAS and /WE (along with /CS) define the command being entered.
A0 to A12 (input pins)
Provided the row address for Active commands and the column address and Auto Precharge bit for Read/Write
commands to select one location out of the memory array in the respective bank. The address inputs also provide
the op-code during mode register set commands.
[Address Pins Table]
Address (A0 to A12)
Part number
Row address
Column address
EDE2508ACSE
AX0 to AX12
AY0 to AY9
Pr
EDE2516ACSE
Note
AX0 to AX12
AY0 to AY8
A10 (AP) (input pin)
A10 is sampled during a precharge command to determine whether the precharge applies to one bank (A10 = low)
or all banks (A10 = high). If only one bank is to be precharged, the bank is selected by BA0, BA1.
[Bank Select Signal Table]
BA0
L
Bank 1
H
Bank 2
L
Bank 3
H
BA1
L
L
H
H
Remark: H: VIH. L: VIL.
ct
Bank 0
u
od
BA0, BA1 (input pins)
BA0 and BA1 define to which bank an active, read, write or precharge command is being applied. BA0 also
determines if the mode register or extended mode register is to be accessed during a MRS or EMRS (1), EMRS (2)
cycle.
CKE (input pin)
CKE high activates, and CKE low deactivates, internal clock signals and device input buffers and output drivers.
Taking CKE low provides precharge power-down and Self-Refresh operation (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. 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 selfrefresh.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
29
EDE2508ACSE, EDE2516ACSE
DM, UDM and LDM (input pins)
DM is an input mask signal for write data. Input data is masked when DM is sampled high coincident 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 matches the DQ and DQS loading.
For ×8 configuration, DM function will be disabled when RDQS function is enabled by EMRS.
In × 16 configuration, UDM controls upper byte (DQ8 to DQ15) and LDM controls lower byte (DQ0 to DQ7). In this
datasheet, DM represents UDM and LDM.
L
EO
DQ (input/output pins)
Bi-directional data bus.
DQS, /DQS UDQS, /UDQS, LDQS, /LDQS (input/output pins)
Output with read data, input with write data for source synchronous operation. Edge-aligned with read data,
centered in write data. Used to capture write data. /DQS can be disabled by EMRS.
In × 16 configuration, UDQS, /UDQS and LDQS, /LDQS control upper byte (DQ8 to DQ15) and lower byte (DQ0 to
DQ7). In this datasheet, DQS represents UDQS and LDQS, /DQS represents /UDQS and /LDQS.
RDQS, /RDQS (output pins)
Differential Data Strobe for READ operation only. DM and RDQS functions are switch able by EMRS. These pins
exist only in ×8 configuration. /RDQS output will be disabled when /DQS is disabled by EMRS.
Pr
ODT (input pins)
ODT (On Die Termination control) is a registered high signal that enables termination resistance internal to
the DDR2 SDRAM. When enabled, ODT is only applied to each DQ, DQS, /DQS, RDQS, /RDQS, and DM signal for
× 8 configurations. For × 16 configuration, ODT is applied to each DQ, UDQS, /UDQS, LDQS, /LDQS, UDM, and
LDM signal. The ODT pin will be ignored if the Extended Mode Register (EMRS) is programmed to disable ODT.
Any time the EMRS enables the ODT function; ODT may not be driven high until eight clocks after the EMRS has
been enabled.
u
od
VDD, VSS, VDDQ, VSSQ (power supply)
VDD and VSS are power supply pins for internal circuits. VDDQ and VSSQ are power supply pins for the output
buffers.
VDDL and VSSDL (power supply)
VDDL and VSSDL are power supply pins for DLL circuits.
VREF (Power supply)
SSTL_18 reference voltage: (0.50 ± 0.01) × VDDQ
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
30
EDE2508ACSE, EDE2516ACSE
Command Operation
Command Truth Table
The DDR2 SDRAM recognizes the following commands specified by the /CS, /RAS, /CAS, /WE and address pins.
CKE
Function
Previou Current
Symbol s cycle cycle
/CS
/RAS /CAS /WE BA0
BA1
A12 to
A11
A10
Mode register set
MRS
H
H
L
L
L
L
L
L
MRS OPCODE
1
EMRS
H
H
L
L
L
L
H
L
EMRS (1) OPCODE
1
EMRS
H
H
L
L
L
L
L
H
EMRS (2) OPCODE
1
L
EO
Extended mode
register set (1)
Extended mode
register set (2)
A0 to
A9
Notes
Auto-refresh
REF
H
H
L
L
L
H
×
×
×
×
×
1
Self-refresh entry
SELF
H
L
L
L
L
H
×
×
×
×
×
1
Self-refresh exit
SELFX L
H
H
×
×
×
×
×
×
×
×
1, 6
L
H
L
H
H
H
×
×
×
×
×
Single bank precharge
PRE
H
H
L
L
H
L
BA
×
L
×
1, 2
Precharge all banks
PALL
H
H
L
L
H
L
×
×
H
×
1
Bank activate
ACT
H
H
L
L
H
H
BA
RA
Write
WRIT
H
H
L
H
L
L
BA
CA
L
CA
1, 2, 3
Write with auto precharge
WRITA H
H
L
H
L
L
BA
CA
H
CA
1, 2, 3
×
1, 2
READ
H
H
L
H
L
H
BA
CA
L
CA
1, 2, 3
Read with auto precharge
READA H
H
L
H
L
H
BA
CA
H
CA
1, 2, 3
No operation
NOP
H
×
L
H
H
H
×
×
×
×
×
1
Device deselect
DESL
H
×
H
×
×
×
×
×
×
×
×
1
Power-down mode entry
PDEN
H
L
H
×
×
×
×
×
×
×
×
1, 4
H
L
L
H
H
H
×
×
×
×
×
L
H
L
H
PDEX
H
×
×
×
×
×
×
×
×
L
H
H
H
×
×
×
×
×
u
od
Power-down mode exit
Pr
Read
1, 4
ct
Remark: H = VIH. L = VIL. × = VIH or VIL. BA = Bank Address, RA = Row Address, CA = Column Address
Notes: 1. All DDR2 commands are defined by states of /CS, /RAS, /CAS, /WE and CKE at the rising edge of the
clock.
2. Bank select (BA0, BA1), determine which bank is to be operated upon.
3. Burst reads or writes should not be terminated other than specified as ″Reads interrupted by a Read″ in
burst read command [READ] or ″Writes interrupted by a Write″ in burst write command [WRIT].
4. The power-down mode does not perform any refresh operations. The duration of power-down is therefore
limited by the refresh requirements of the device. One clock delay is required for mode entry and exit.
5. The state of ODT does not affect the states described in this table. The ODT function is not available
during self-refresh.
6. Self-refresh exit is asynchronous.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
31
EDE2508ACSE, EDE2516ACSE
CKE Truth Table
CKE
Current state*
2
Power-down
Self-refresh
*3
Current
*1
cycle (n)
Command(n)
/CS, /RAS, /CAS, /WE
Operation (n)
L
L
×
Maintain power-down
11, 13, 15
L
H
DESL or NOP
Power-down exit
4, 8, 11, 13
L
L
×
Maintain self-refresh
11, 15
L
H
DESL or NOP
Self-refresh exit
4, 5, 9
Active power-down entry
4, 8, 10, 11, 13
L
EO
Previous
1
cycle (n-1)*
Notes
Bank Active
H
L
All banks idle
H
L
DESL or NOP
Precharge power-down entry
4, 8, 10, 11, 13
H
L
SELF
Self-refresh entry
6, 9, 11, 13
H
H
Refer to the Command Truth Table
Any state other than
listed above
DESL or NOP
*3
7
ct
u
od
Pr
Remark: H = VIH. L = VIL. × = Don’t care
Notes: 1. CKE (n) is the logic state of CKE at clock edge n; CKE (n−1) was the state of CKE at the previous clock
edge.
2. Current state is the state of the DDR SDRAM immediately prior to clock edge n.
3. Command (n) is the command registered at clock edge n, and operation (n) is a result of Command (n).
4. All states and sequences not shown are illegal or reserved unless explicitly described elsewhere in this
document.
5. On self-refresh exit, [DESL] or [NOP] commands must be issued on every clock edge occurring during the
tXSNR period. Read commands may be issued only after tXSRD (200 clocks) is satisfied.
6. Self-refresh mode can only be entered from the all banks idle state.
7. Must be a legal command as defined in the command truth table.
8. Valid commands for power-down entry and exit are [NOP] and [DESL] only.
9. Valid commands for self-refresh exit are [NOP] and [DESL] only.
10. Power-down and self-refresh can not be entered while read or write operations, (extended) mode register
set operations or precharge operations are in progress. See section Power-Down and Self-Refresh
Command for a detailed list of restrictions.
11. Minimum CKE high time is 3 clocks; minimum CKE low time is 3 clocks.
12. The state of ODT does not affect the states described in this table. The ODT function is not available
during self-refresh. See section ODT (On Die Termination).
13. The power-down does not perform any refresh operations. The duration of power-down mode is therefore
limited by the refresh requirements outlined in section automatic refresh command.
14. CKE must be maintained high while the SDRAM is in OCD calibration mode.
15. “×” means “don’t care” (including floating around VREF) in self-refresh and power-down. However ODT
must be driven high or low in power-down if the ODT function is enabled (bit A2 or A6 set to “1” in
EMRS(1) ).
Preliminary Data Sheet E0948E30 (Ver. 3.0)
32
EDE2508ACSE, EDE2516ACSE
Function Truth Table
The following tables show the operations that are performed when each command is issued in each state of the
DDR SDRAM.
Current state
/CS
/RAS /CAS /WE
Address
Command
Operation
Idle
H
×
×
×
×
DESL
Nop
L
H
H
H
×
NOP
Nop
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1
L
H
L
BA, CA, A10 (AP)
1
ILLEGAL
L
H
L
H
BA, RA
ACT
Row activating
L
L
H
L
BA
PRE
Nop
L
EO
WRIT/WRITA
L
Bank(s) active
L
L
H
L
A10 (AP)
PALL
Nop
L
L
L
H
×
REF
Auto-refresh
2
L
L
L
H
×
SELF
Self-refresh
2
L
L
L
L
BA, MRS-OPCODE
MRS
Mode register accessing
2
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
Extended mode register accessing 2
H
×
×
×
×
DESL
Nop
L
H
H
H
×
NOP
Nop
L
H
L
H
BA, CA, A10 (AP)
READ/READA
Begin Read
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
Begin Write
H
H
BA, RA
ACT
L
L
L
L
L
L
L
L
L
L
L
L
ILLEGAL
H
L
BA
PRE
Precharge
H
L
A10 (AP)
PALL
Precharge all banks
L
H
×
REF
ILLEGAL
L
H
×
SELF
ILLEGAL
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
H
×
×
×
×
L
H
H
H
×
L
H
L
H
BA, CA, A10 (AP)
L
H
L
L
L
L
H
H
L
L
H
DESL
NOP
1
ILLEGAL
u
od
L
L
Pr
Read
Notes
Continue burst to end -> Row
active
Continue burst to end -> Row
active
READ/READA
Burst interrupt
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1
BA, RA
ACT
ILLEGAL
1
L
BA
PRE
ILLEGAL
1, 8
8
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
Preliminary Data Sheet E0948E30 (Ver. 3.0)
33
ct
L
L
1, 4
EDE2508ACSE, EDE2516ACSE
/CS
/RAS /CAS /WE
Address
Command
Write
H
×
×
×
×
DESL
L
H
H
H
×
NOP
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
Burst interrupt
1, 4
L
L
H
H
BA, RA
ACT
ILLEGAL
1
PRE
ILLEGAL
1, 8
8
L
EO
Current state
L
Read with auto
precharge
H
L
BA
Note
Continue burst to end
-> Write recovering
Continue burst to end
-> Write recovering
1
L
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE EMRS (1) (2)
ILLEGAL
H
×
×
×
×
DESL
L
H
H
H
×
NOP
Continue burst to end ->
Precharging
Continue burst to end ->
Precharging
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1, 7
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1, 7
L
L
H
H
BA, RA
ACT
ILLEGAL
1, 7
L
L
H
L
BA
PRE
ILLEGAL
1, 7, 8
L
L
H
L
A10 (AP)
PALL
ILLEGAL
7, 8
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE EMRS (1) (2)
ILLEGAL
u
od
Pr
Write with auto
Precharge
L
Operation
Continue burst to end
->Write recovering with auto
precharge
Continue burst to end
->Write recovering with auto
precharge
×
×
×
×
L
H
H
H
×
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1, 7
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1, 7
L
L
H
H
BA, RA
ACT
ILLEGAL
1, 7
L
L
H
L
BA
PRE
ILLEGAL
1, 7, 8
L
L
H
L
A10 (AP)
PALL
ILLEGAL
7, 8
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE EMRS (1) (2)
DESL
NOP
Preliminary Data Sheet E0948E30 (Ver. 3.0)
34
ct
H
ILLEGAL
EDE2508ACSE, EDE2516ACSE
Current state
/CS
/RAS /CAS /WE
Address
Command
Operation
Precharging
H
×
×
×
×
DESL
Nop -> Enter idle after tRP
L
H
H
H
×
NOP
Nop -> Enter idle after tRP
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1
L
L
H
H
BA, RA
ACT
ILLEGAL
1
L
L
H
L
BA
PRE
Nop -> Enter idle after tRP
1, 8
L
L
H
L
A10 (AP)
PALL
Nop -> Enter idle after tRP
8
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
L
EO
Row activating
ILLEGAL
Nop -> Enter bank active after
tRCD
Nop -> Enter bank active after
tRCD
H
×
×
×
×
DESL
L
H
H
H
×
NOP
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1, 5
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1, 5
L
L
H
H
BA, RA
ACT
ILLEGAL
1
L
L
H
L
BA
PRE
ILLEGAL
L
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
×
L
ILLEGAL
Nop -> Enter bank active after
tWR
Nop -> Enter bank active after
tWR
×
×
×
H
H
H
×
L
H
L
H
BA, CA, A10 (AP)
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
New write
L
L
H
H
BA, RA
ACT
ILLEGAL
1
L
L
H
L
BA
PRE
ILLEGAL
1
DESL
u
od
H
Pr
Write recovering
Note
NOP
READ/READA
ILLEGAL
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
Preliminary Data Sheet E0948E30 (Ver. 3.0)
35
ct
L
L
1, 6
EDE2508ACSE, EDE2516ACSE
/CS
/RAS /CAS /WE
Address
Command
Operation
Write recovering
with auto
precharge
H
×
×
×
×
DESL
Nop -> Precharging after tWR
L
H
H
H
×
NOP
Nop -> Precharging after tWR
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
1
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
1
L
L
H
H
BA, RA
ACT
ILLEGAL
1
1
L
EO
Current state
Refresh
L
H
L
BA
PRE
ILLEGAL
L
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
H
×
×
×
×
DESL
Nop -> Enter idle after tRFC
L
H
H
H
×
NOP
Nop -> Enter idle after tRFC
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
L
L
H
H
BA, RA
ACT
ILLEGAL
L
L
H
L
BA
PRE
ILLEGAL
L
L
H
L
A10 (AP)
PALL
ILLEGAL
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
H
×
×
×
×
DESL
Nop -> Enter idle after tMRD
L
H
H
H
×
NOP
Nop -> Enter idle after tMRD
L
H
L
H
BA, CA, A10 (AP)
READ/READA
ILLEGAL
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
L
L
H
H
BA, RA
ACT
ILLEGAL
L
L
H
L
BA
PRE
ILLEGAL
u
od
L
L
Pr
Mode register
accessing
L
Note
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
Preliminary Data Sheet E0948E30 (Ver. 3.0)
36
ct
L
L
EDE2508ACSE, EDE2516ACSE
Current state
/CS
/RAS /CAS /WE
Address
Command
Operation
Extended Mode
H
×
×
×
×
DESL
Nop -> Enter idle after tMRD
register accessing L
H
H
H
×
NOP
Nop -> Enter idle after tMRD
L
H
L
H
BA, CA, A10 (AP)
READ/READA ILLEGAL
L
H
L
L
BA, CA, A10 (AP)
WRIT/WRITA
ILLEGAL
L
L
H
H
BA, RA
ACT
ILLEGAL
L
L
H
L
BA
ILLEGAL
L
H
L
A10 (AP)
PALL
ILLEGAL
L
L
L
H
×
REF
ILLEGAL
L
L
L
H
×
SELF
ILLEGAL
L
L
L
L
BA, MRS-OPCODE
MRS
ILLEGAL
L
L
L
L
BA, EMRS-OPCODE
EMRS (1) (2)
ILLEGAL
L
EO
PRE
L
Remark:
Notes: 1.
2.
3.
4.
5.
6.
7.
Note
Pr
H = VIH. L = VIL. × = VIH or VIL
This command may be issued for other banks, depending on the state of the banks.
All banks must be in "IDLE".
All AC timing specs must be met.
Only allowed at the boundary of 4 bits burst. Burst interruptions at other timings are illegal.
Available in case tRCD is satisfied by AL setting.
Available in case tWTR is satisfied.
The DDR2 SDRAM supports the concurrent auto-precharge feature, a read with auto-precharge
enabled,or a write with auto-precharge enabled, may be followed by any column command to other
banks, as long as that command does not interrupt the read or write data transfer, and all other related
limitations apply. (E.g. Conflict between READ data and WRITE data must be avoided.)
The minimum delay from a read or write command with auto precharge enabled, to a command to a
different bank, is summarized below.
To command (different bank, noninterrupting command)
Minimum delay
(Concurrent AP supported)
Units
Read w/AP
Read or Read w/AP
BL/2
tCK
Write or Write w/AP
Precharge or Activate
Write w/AP
Read or Read w/AP
Write or Write w/AP
Precharge or Activate
u
od
From command
(BL/2) + 2
tCK
1
tCK
(CL − 1) + (BL/2) + tWTR
tCK
BL/2
tCK
1
tCK
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
37
EDE2508ACSE, EDE2516ACSE
8. The minimum delay from the read, write and precharge command to the precharge command to the same
bank is summarized below.
[Precharge and Auto Precharge Clarification]
From command
Read
Read w/AP
Minimum delay between “From
command” to “To Command“
To command
Units
Notes
Precharge (to same bank as read)
AL + (BL/2) + Max.(RTP, 2) − 2
tCK
a, b
Precharge all
AL + (BL/2) + Max.(RTP, 2) − 2
tCK
a, b
Precharge (to same bank as read w/AP)
AL + (BL/2) + Max.(RTP, 2) − 2
tCK
a, b
Precharge all
tCK
a, b
WL + (BL/2) + tWR
tCK
b
Precharge all
WL + (BL/2) + tWR
tCK
b
Precharge (to same bank as write w/AP)
WL + (BL/2) + WR
tCK
b
Precharge all
WL + (BL/2) + WR
tCK
b
Precharge
Precharge (to same bank as precharge)
1
tCK
b
Precharge all
1
tCK
b
Precharge all
Precharge
1
tCK
b
Precharge all
1
tCK
b
L
EO
AL + (BL/2) + Max.(RTP, 2) − 2
Precharge (to same bank as write)
Write
Write w/AP
ct
u
od
Pr
a. RTP[cycles] = RU{ tRTP[ns] / tCK[ns] }, where RU stands for round up.
tCK(avg) should be used in place of tCK for DDR2-667/800.
b. For a given bank, the precharge period should be counted from the latest precharge command, either one
bank precharge or precharge all, issued to that bank. The precharge period is satisfied after tRP
depending on the latest precharge command issued to that bank.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
38
EDE2508ACSE, EDE2516ACSE
Simplified State Diagram
INITIALIZATION
SEQUENCE
OCD
CALIBRATION
CKE_L
SELF
REFRESH
PRE
LF
SE
L
EO
MRS
EMRS (1)
EMRS (2)
EMRS (3)
(E)MRS
H
E_
IDLE
CK
REF
ALL BANKS
PRECHARGED
CK
L
E_L
E_
CK
CK
E_H
ACT
PRECHARGE
POWER
DOWN
CKE_L
ACTIVATING
CKE_L
AUTO
REFRESH
_L
CKE
Pr
ACTIVE
POWER
DOWN
CKE
_H
CKE
_L
BANK
ACTIVE
RE
AD
IT
WR
u
od
WRIT
RI
W
A
READ
WRITE
AD
RE
TA
READ
READ
WRIT
WRITA
READA
A
RIT
W
REA
DA
PRE, PALL
PRE, PALL
PRE, PALL
PRECHARGE
Simplified State Diagram
Preliminary Data Sheet E0948E30 (Ver. 3.0)
39
READA
ct
WRITA
Automatic sequence
Command sequence
EDE2508ACSE, EDE2516ACSE
Operation of DDR2 SDRAM
Read and write accesses to the DDR2 SDRAM are burst oriented; accesses start at a selected location and continue
for the fixed burst length of four or eight in a programmed sequence. Accesses begin with the registration of an
active command, which is then followed by a read or write command. The address bits registered coincident with
the active command is used to select the bank and row to be accessed (BA0, BA1 select the bank; A0 to A12 select
the row). The address bits registered coincident with the read or write command are used to select the starting
column location for the burst access and to determine if the auto precharge command is to be issued.
Prior to normal operation, the DDR2 SDRAM must be initialized. The following sections provide detailed information
covering device initialization; register definition, command descriptions and device operation.
L
EO
Power On and Initialization
DDR2 SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than
those specified may result in undefined operation.
ct
u
od
Pr
Power-Up and Initialization Sequence
The following sequence is required for power up and initialization.
1
1. Apply power and attempt to maintain CKE below 0.2 × VDDQ and ODT * at a low state (all other inputs may be
undefined.)
⎯ VDD, VDDL and VDDQ are driven from a single power converter output, AND
⎯ VTT is limited to 0.95V max, AND
⎯ VREF tracks VDDQ/2.
or
⎯ Apply VDD before or at the same time as VDDL.
⎯ Apply VDDL before or at the same time as VDDQ.
⎯ Apply VDDQ before or at the same time as VTT and VREF.
at least one of these two sets of conditions must be met.
2. Start clock and maintain stable condition.
3. For the minimum of 200μs after stable power and clock (CK, /CK), then apply [NOP] or [DESL] and take CKE
high.
4. Wait minimum of 400ns then issue precharge all command. [NOP] or [DESL] applied during 400ns period.
5. Issue EMRS (2) command. (To issue EMRS (2) command, provide low to BA0, high to BA1.)
6. Issue EMRS (3) command. (To issue EMRS (3) command, high to BA0 and BA1.)
7. Issue EMRS to enable DLL. (To issue DLL enable command, provide low to A0, high to BA0 and low to BA1.)
8. Issue a mode register set command for DLL reset.
(To issue DLL reset command, provide high to A8 and low to BA0, BA1.)
9. Issue precharge all command.
10. Issue 2 or more auto-refresh commands.
11. Issue a mode register set command with low to A8 to initialize device operation. (i.e. to program operating
parameters without resetting the DLL.)
12. At least 200 clocks after step 8, execute OCD calibration (Off Chip Driver impedance adjustment). If OCD
calibration is not used, EMRS OCD default command (A9 = A8 = A7 = 1) followed by EMRS OCD calibration
mode exit command (A9 = A8 = A7 = 0) must be issued with other operating parameters of EMRS.
13. The DDR2 SDRAM is now ready for normal operation.
Note: 1. To guarantee ODT off, VREF must be valid and a low level must be applied to the ODT pin.
tCH tCL
CK
/CK
tIS
CKE
Command
PALL
NOP
400ns
EMRS(2)
tRP
EMRS(3)
tMRD
EMRS
tMRD
DLL enable
MRS
tMRD
PALL
tMRD
REF
REF
tRP
tRFC
DLL reset
MRS
tRFC
EMRS
tMRD
OCD default
200 cycles (min)
Power up and Initialization Sequence
Preliminary Data Sheet E0948E30 (Ver. 3.0)
40
Any
command
EMRS
Follow OCD
Flowchart
tOIT
OCD calibration mode
exit
EDE2508ACSE, EDE2516ACSE
Programming the Mode Register and Extended Mode Registers
L
EO
For application flexibility, burst length, burst type, /CAS latency, DLL reset function, write recovery time (tWR)
are user defined variables and must be programmed with a mode register set command [MRS]. Additionally, DLL
disable function, driver impedance, additive /CAS latency, ODT (On Die Termination), single-ended strobe, and OCD
(Off-Chip Driver Impedance Adjustment) are also user defined variables and must be programmed with an extended
mode register set command [EMRS]. Contents of the Mode Register (MR) or Extended Mode Registers (EMR (#))
can be altered by reexecuting the MRS and EMRS commands. If the user chooses to modify only a subset of the
MRS or EMRS variables, all variables must be redefined when the MRS or EMRS commands are issued.
MRS, EMRS and Reset DLL do not affect array contents, which means reinitialization including those can be
executed any time after power-up without affecting array contents.
Pr
DDR2 SDRAM Mode Register Set [MRS]
The mode register stores the data for controlling the various operating modes of DDR2 SDRAM. It controls /CAS
latency, burst length, burst sequence, test mode, DLL reset, tWR and various vendor specific options to make DDR2
SDRAM useful for various applications. The default value of the mode register is not defined, therefore the mode
register must be written after power-up for proper operation. The mode register is written by asserting low on /CS,
/RAS, /CAS, /WE, BA0 and BA1, while controlling the state of address pins A0 to A12.
The DDR2 SDRAM should be in all bank precharge with CKE already high prior to writing into the mode register.
The mode register set command cycle time (tMRD) is required to complete the write operation to the mode register.
The mode register contents can be changed using the same command and clock cycle requirements during normal
operation as long as all banks are in the precharge state. The mode register is divided into various fields depending
on functionality. Burst length is defined by A0 to A2 with options of 4 and 8 bit burst lengths. The burst length
decodes are compatible with DDR SDRAM. Burst address sequence type is defined by A3, /CAS latency is defined
by A4 to A6. The DDR2 doesn’t support half clock latency mode. A7 is used for test mode. A8 is used for DLL reset.
A7 must be set to low for normal MRS operation. Write recovery time tWR is defined by A9 to A11. Refer to the
table for specific codes.
BA1 BA0 A12 A11 A10 A9
0*1
DLL reset
0
No
1
BA1 BA0
PD
WR
A7
DLL TM
MRS mode
A5
A4
A3
/CAS latency
BT
A2
A1
A0
Burst length
A7
Mode
A3
Burst type
0
Normal
0
Sequential
1
Yes
A6
Address field
Mode register
u
od
A8
0
A8
1
Test
Burst length
Interleave
Write recovery for autoprecharge
A2
A1
A0
BL
0
1
0
4
0
1
1
8
/CAS latency
A10
A9
WR
A6
A5
A4
Latency
1
0
EMRS(2)
0
0
0
Reserved
0
0
0
Reserved
1
1
EMRS(3): Reserved
0
0
1
2
0
0
1
Reserved
0
1
0
3
0
1
0
Reserved
1
4
0
1
1
3
0
5
1
0
0
4
1
6
1
0
1
5
1
0
Reserved
1
1
Reserved
DDR2 667
A11
DDR2 800
EMRS(1)
DDR2 400
MRS
1
DDR2 533
0
0
A12
Active power down exit timing
0
1
0
Fast exit (use tXARD timing)
1
0
1
Slow exit (use tXARDS timing)
1
0
1
1
0
Reserved
1
1
1
1
Reserved
1
ct
0
Notes: 1. BA1 is reserved for future use and must be programmed to 0 when setting the mode register.
2. WR (min.) (Write Recovery for autoprecharge) is determined by tCK (max.) and WR (max.) is determined by tCK (min.).
WR in clock cycles is calculated by dividing tWR (in ns) by tCK (in ns) and rounding up to the next integer
(WR [cycles] = tWR (ns) / tCK (ns)).
The mode register must be programmed to this value. This is also used with tRP to determine tDAL.
Mode Register Set (MRS)
Preliminary Data Sheet E0948E30 (Ver. 3.0)
41
EDE2508ACSE, EDE2516ACSE
DDR2 SDRAM Extended Mode Registers Set [EMRS]
L
EO
EMRS (1) Programming
The extended mode register (1) stores the data for enabling or disabling the DLL, output driver strength, additive
latency, ODT, /DQS disable, OCD program, RDQS enable. The default value of the extended mode register (1) is
not defined, therefore the extended mode register (1) must be written after power-up for proper operation. The
extended mode register (1) is written by asserting low on /CS, /RAS, /CAS, /WE, high on BA0 and low on BA1, while
controlling the states of address pins A0 to A12. The DDR2 SDRAM should be in all banks precharge with CKE
already high prior to writing into the extended mode register (1). The mode register set command cycle time (tMRD)
must be satisfied to complete the write operation to the extended mode register (1). Mode register contents can be
changed using the same command and clock cycle requirements during normal operation as long as all banks are in
the precharge state. A0 is used for DLL enable or disable. A1 is used for enabling a half strength output driver. A3
to A5 determines the additive latency, A7 to A9 are used for OCD control, A10 is used for /DQS disable and A11 is
used for RDQS enable. A2 and A6 are used for ODT setting.
BA1 BA0 A12 A11 A10 A9
0
1
BA1 BA0
0
0
A8
A7
A6
Qoff RDQS /DQS OCD program
A5
A4
0
1
EMRS(1)
1
0
EMRS(2)
1
1
EMRS(3): Reserved
A2
A1
A0
Address field
Rtt Additive latency Rtt D.I.C DLL
MRS mode
MRS
A3
A6
A2
Rtt (nominal )
0
0
ODT Disabled
0
1
75Ω
1
0
150Ω
1
1
50Ω
Extended mode register
A0
DLL enable
0
Enable
1
Disable
Pr
Driver impedance adjustment
A9
0
0
0
1
A7
0
0
OCD calibration mode exit
0
1
Drive(1)
1
0
Drive(0)
A5
A4
A3
Latency
0
0
Adjust mode* 1
0
0
0
0
1
1
OCD Calibration default* 2
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
Reserved
1
1
0
Reserved
1
1
1
Reserved
A12
Qoff*3
0
Output buffers enabled
1
Output buffers disabled
A10
/DQS enable
0
Enable
1
Disable
Additive latency
u
od
1
Operation
A8
Driver strength control
Output driver
A11
RDQS enable
0
Disable
1
Enable
impedance control
size
0
Normal
100%
1
Weak
60%
ct
A11
Strobe function matrix
A10
(RDQS enable)
Driver
A1
(/DQS enable) RDQS/DM
0 (Disable)
0 (Enable)
DM
0 (Disable)
1 (Disable)
DM
1 (Enable)
0 (Enable)
RDQS
1 (Enable)
1 (Disable)
RDQS
/RDQS
DQS
High-Z
DQS
/DQS
High-Z
DQS
High-Z
/RDQS
DQS
/DQS
High-Z
DQS
High-Z
Notes: 1. When adjust mode is issued, AL from previously set value must be applied.
2. After setting to default, OCD mode needs to be exited by setting A9 to A7 to 000.
Refer to the chapter Off-Chip Driver (OCD)Impedance Adjustment for detailed information
3. Output disabled - DQ, DQS, /DQS, RDQS, /RDQS. This feature is used in conjunction with DIMM
IDD measurements when IDDQ is not desired to be included..
EMRS (1)
Preliminary Data Sheet E0948E30 (Ver. 3.0)
42
/DQS
EDE2508ACSE, EDE2516ACSE
DLL Enable/Disable
The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and upon
returning to normal operation after having the DLL disabled. The DLL is automatically disabled when entering selfrefresh operation and is automatically re-enabled upon exit of self-refresh operation. Any time the DLL is enabled
(and subsequently reset), 200 clock cycles must occur before a read command can be issued to allow time for the
internal clock to be synchronized with the external clock. Failing to wait for synchronization to occur may result in a
violation of the tAC or tDQSCK parameters.
*1
L
EO
EMRS (2) Programming
The extended mode register (2) controls refresh related features. The default value of the extended mode
register (2) is not defined, therefore the extended mode register (2) must be written after power-up for proper
operation. The extended mode register (2) is written by asserting low on CS, /RAS, /CAS, /WE, high on BA1 and low
on BA0, while controlling the states of address pins A0 to A12. The DDR2 SDRAM should be in all bank precharge
with CKE already high prior to writing into the extended mode register (2). The mode register set command cycle
time (tMRD) must be satisfied to complete the write operation to the extended mode register (2). Mode register
contents can be changed using the same command and clock cycle requirements during normal operation as long
as all banks are in the precharge state.
BA1 BA0 A12
1
A11
A10
A9
A8
0*1
0
A7
A6
A5
A4
A3
A2
A1
A0
Extended mode register (2)
0*1
SRF
Address field
High Temperature
Self-refresh rate
Enable
A7
Pr
0
Disable
1
Enable
Note: 1 The rest bits in EMRS (2) is reserved for future use and all bits in EMRS (2) except A7, BA0 and BA1
must be programmed to 0 when setting the extended mode register (2) during initialization.
EMRS(2)
BA1 BA0 A12
1
A11
A10
A9
1
A8
0*1
A7
u
od
EMRS (3) Programming: Reserved*1
A6
A5
A4
A3
A2
A1
A0
Address Field
Extended Mode Register(3)
Note : 1. EMRS (3) is reserved for future use and all bits except BA0 and BA1 must be programmed
to 0 when setting the mode register during initialization.
EMRS (3)
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
43
EDE2508ACSE, EDE2516ACSE
Off-Chip Driver (OCD) Impedance Adjustment
DDR2 SDRAM supports driver calibration feature and the OCD Flow Chart is an example of sequence. Every
calibration mode command should be followed by “OCD calibration mode exit” before any other command being
issued. MRS should be set before entering OCD impedance adjustment and ODT (On Die Termination) should be
carefully controlled depending on system environment.
MRS should be set before entering OCD impedance adjustment and ODT should
be carefully controlled depending on system environment
Start
EMRS: OCD calibration mode exit
L
EO
EMRS: Drive(1)
EMRS: Drive(0)
DQ & DQS high ; /DQS low
DQ & DQS low ; /DQS high
ALL OK
ALL OK
Test
Need calibration
Test
Need calibration
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
Pr
EMRS :
EMRS :
Enter Adjust Mode
Enter Adjust Mode
u
od
BL=4 code input to all DQs
BL=4 code input to all DQs
Inc, Dec, or NOP
Inc, Dec, or NOP
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
OCD Flow Chart
Preliminary Data Sheet E0948E30 (Ver. 3.0)
44
ct
End
EDE2508ACSE, EDE2516ACSE
L
EO
Extended Mode Register Set for OCD Impedance Adjustment
OCD impedance adjustment can be done using the following EMRS mode. In drive mode all outputs are driven out
by DDR2 SDRAM and drive of RDQS is dependent on EMRS bit enabling RDQS operation. In Drive (1) mode, all
DQ, DQS (and RDQS) signals are driven high and all /DQS signals are driven low. In drive (0) mode, all DQ, DQS
(and RDQS) signals are driven low and all /DQS signals are driven high.
In adjust mode, BL = 4 of operation code data must be used. In case of OCD calibration default, output driver
characteristics follow approximate nominal V/I curve for 18Ω output drivers, but are not guaranteed. If tighter control
is required, which is controlled within 18Ω ± 3Ω driver impedance range, OCD must be used.
OCD applies only to normal full strength output drive setting defined by EMRS (1) and if reduced strength is set,
OCD default output driver characteristics are not applicable. When OCD calibration adjust mode is used, OCD
default output driver characteristics are not applicable.
[OCD Mode Set Program]
A9
A8
A7
Operation
0
0
0
OCD calibration mode exit
0
0
1
Drive (1) DQ, DQS, (RDQS) high and /DQS low
0
1
0
Drive (0) DQ, DQS, (RDQS) low and /DQS high
1
0
0
Adjust mode
1
1
1
OCD calibration default
[OCD Adjustment Program]
4bits burst data inputs to all DQs
u
od
Pr
OCD Impedance Adjustment
To adjust output driver impedance, controllers must issue the ADJUST EMRS command along with a 4bit burst code
to DDR2 SDRAM as in OCD Adjustment Program table. For this operation, burst length has to be set to BL = 4 via
MRS command before activating OCD and controllers must drive this burst code to all DQs at the same time. DT0 in
OCD Adjustment Program table means all DQ bits at bit time 0, DT1 at bit time 1, and so forth. The driver output
impedance is adjusted for all DDR2 SDRAM DQs simultaneously and after OCD calibration, all DQs and DQS's of a
given DDR2 SDRAM will be adjusted to the same driver strength setting. The maximum step count for adjustment is
16 and when the limit is reached, further increment or decrement code has no effect. The default setting may be any
step within the 16-step range. When Adjust mode command is issued, AL from previously set value must be
applied.
Operation
DT0
DT1
DT2
DT3
Pull-up driver strength
Pull-down driver strength
0
0
0
0
NOP
NOP
0
0
0
1
Increase by 1 step
NOP
0
0
1
0
Decrease by 1 step
NOP
0
1
0
0
NOP
Increase by 1 step
1
0
0
0
0
1
0
1
Increase by 1 step
0
1
1
0
Decrease by 1 step
1
0
0
1
Increase by 1 step
1
0
1
0
Decrease by 1 step
NOP
Reserved
Preliminary Data Sheet E0948E30 (Ver. 3.0)
45
ct
Other combinations
Decrease by 1 step
Increase by 1 step
Increase by 1 step
Decrease by 1 step
Decrease by 1 step
EDE2508ACSE, EDE2516ACSE
For proper operation of adjust mode, WL = RL − 1 = AL + CL − 1 clocks and tDS/tDH should be met as the Output
Impedance Control Register Set Cycle. For input data pattern for adjustment, DT0 to DT3 is a fixed order and not
affected by MRS addressing mode (i.e. sequential or interleave).
/CK
CK
Command
EMRS
NOP
EMRS
NOP
tWR
WL
DQS, /DQS
L
EO
tDS tDH
DQ_in
DT0
DT1
DT2
DT3
OCD adjust mode
OCD calibration mode exit
Output Impedance Control Register Set Cycle
Drive Mode
Drive mode, both drive (1) and drive (0), is used for controllers to measure DDR2 SDRAM Driver impedance before
OCD impedance adjustment. In this mode, all outputs are driven out tOIT after “Enter drive mode” command and all
output drivers are turned-off tOIT after “OCD calibration mode exit” command as the ”Output Impedance
Measurement/Verify Cycle”.
/CK
Command
EMRS
High-Z
DQS, /DQS
Pr
CK
EMRS
NOP
High-Z
DQs high and /DQS low for drive (1), DQs low and /DQS high for drive (0)
u
od
DQs high for drive (1)
DQ
DQs low for drive (0)
tOIT
tOIT
Enter drivemode
OCD Calibration mode exit
Output Impedance Measurement/Verify Cycle
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
46
EDE2508ACSE, EDE2516ACSE
ODT (On Die Termination)
On Die Termination (ODT), is a feature that allows a DRAM to turn on/off termination resistance for each DQ, DQS,
/DQS, RDQS, /RDQS, and DM signal via the ODT control pin. The ODT feature is designed to improve signal
integrity of the memory channel by allowing the DRAM controller to independently turn on/off termination resistance
for any or all DRAM devices.
The ODT function is turned off and not supported in self-refresh mode.
VDDQ
VDDQ
VDDQ
L
EO
sw1
sw3
sw2
Rval1
Rval3
Rval2
DRAM
input
buffer
Input
Pin
Rval1
sw1
VSSQ
Rval2
Rval3
sw2
sw3
VSSQ
VSSQ
Pr
Switch sw1, sw2 or sw3 is enabled by ODT pin.
Selection between sw1, sw2 or sw3 is determined by Rtt (nominal) in EMRS
Termination included on all DQs, DM, DQS, /DQS, RDQS and /RDQS pins.
Target Rtt (Ω) = (Rval1) / 2, (Rval2) / 2 or (Rval3) / 2
Functional Representation of ODT
/CK
Command
EMRS
tAOFD
ODT
u
od
CK
NOP
tIS
tMOD (max.)
tMOD (min.)
Rtt
Updating
New Setting
ct
Old setting
Note: tAOFD must be met before issuing EMRS command. ODT must remain low for the entire duration of tMOD window.
ODT update Delay Timing
Preliminary Data Sheet E0948E30 (Ver. 3.0)
47
EDE2508ACSE, EDE2516ACSE
/CK
T0
T1
T2
T3
T4
T5
T6
CK
CKE
tAXPD ≤ 6tCK
tIS
tIS
L
EO
ODT
tAOFD
tAOND
Internal
Term Res.
Rtt
tAON min.
tAOF min.
tAON max.
tAOF max.
ODT Timing for Active and Standby Mode
/CK
T0
T1
T2
T3
T4
T5
T6
CK
CKE
tAXPD ≤ 6tCK
ODT
tIS
Pr
tIS
tAOFPD max.
tAOFPD min.
Internal
Term Res.
Rtt
tAONPD min.
tAONPD max.
u
od
ODT Timing for Power-Down Mode
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
48
EDE2508ACSE, EDE2516ACSE
T-5
T-4
T-3
T-2
T-1
T0
T1
T2
T3
T4
/CK
CK
tANPD
tIS
CKE
Entering slow exit active power down mode
or precharge power down mode.
L
EO
tIS
ODT
Internal
Term Res.
Active and standby
mode timings to
be applied.
tAOFD
Rtt
tIS
ODT
Internal
Term Res.
Power down
mode timings to
be applied.
tAOFPD(max.)
Rtt
tIS
Pr
ODT
tAOND
Internal
Term Res.
Rtt
Active and standby
mode timings to
be applied.
tIS
u
od
ODT
Power down
mode timings to
be applied.
tAONPD(max.)
Internal
Term Res.
Rtt
ODT Timing Mode Switch at Entering Power-Down Mode
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
49
EDE2508ACSE, EDE2516ACSE
T0
T1
T4
T5
T6
T7
T8
T9
T10
T11
/CK
CK
tIS
tAXPD
CKE
L
EO
Exiting from slow active power down mode
or precharge power down mode.
Active and standby
mode timings to
be applied.
Power down
mode timings to
be applied.
tIS
ODT
tAOFD
Internal
Term Res.
Rtt
tIS
ODT
tAOFPD (max.)
Internal
Term Res.
Rtt
tIS
Pr
Active and standby
mode timings to
be applied.
ODT
tAOND
Internal
Term Res.
Rtt
Power down
mode timings to
be applied.
ODT
u
od
tIS
tAONPD(max.)
Internal
Term Res.
Rtt
ODT Timing Mode Switch at Exiting Power-Down Mode
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
50
EDE2508ACSE, EDE2516ACSE
L
EO
Bank Activate Command [ACT]
The bank activate command is issued by holding /CAS and /WE high with /CS and /RAS low at the rising edge of the
clock. The bank addresses BA0 and BA1, are used to select the desired bank. The row address A0 through A12 is
used to determine which row to activate in the selected bank. The Bank activate command must be applied before
any read or write operation can be executed. Immediately after the bank active command, the DDR2 SDRAM can
accept a read or write command on the following clock cycle. If a R/W command is issued to a bank that has not
satisfied the tRCD (min.) specification, then additive latency must be programmed into the device to delay when the
R/W command is internally issued to the device. The additive latency value must be chosen to assure tRCD (min.)
is satisfied. Additive latencies of 0, 1, 2, 3 and 4 are supported. Once a bank has been activated it must be
precharged before another bank activate command can be applied to the same bank. The bank active and
precharge times are defined as tRAS and tRP, respectively. The minimum time interval between successive bank
activate commands to the same bank is determined by the /RAS cycle time of the device (tRC), which is equal to
tRAS + tRP. The minimum time interval between successive bank activate commands to the different bank is
determined by (tRRD).
/CK
T0
T1
T2
T3
Tn
Tn+1
Tn+2
Tn+3
PRE
ACT
CK
Command
ACT
Posted
READ
ACT
Posted
READ
PRE
tRCD(min.)
Address
ROW: 0
COL: 0
ROW: 1
COL: 1
ROW: 0
tCCD
Bank0 Read begins
Pr
Additive latency (AL)
tRRD
tRAS
tRP
tRC
Bank0
Active
Bank1
Active
Bank0
Precharge
Bank1
Precharge
Bank0
Active
u
od
Bank Activate Command Cycle (tRCD = 3, AL = 2, tRP = 3, tRRD = 2, tCCD = 2)
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
51
EDE2508ACSE, EDE2516ACSE
Read and Write Access Modes
L
EO
After a bank has been activated, a read or write cycle can be executed. This is accomplished by setting /RAS high,
/CS and /CAS low at the clock’s rising edge. /WE must also be defined at this time to determine whether the access
cycle is a read operation (/WE high) or a write operation (/WE low).
The DDR2 SDRAM provides a fast column access operation. A single read or write command will initiate a serial
read or write operation on successive clock cycles. The boundary of the burst cycle is strictly restricted to specific
segments of the page length. For example, the 32M bits × 4 I/O × 4 banks chip has a page length of 2048 bits
(defined by CA0 to CA9, CA11). The page length of 2048 is divided into 512 uniquely addressable boundary
segments (4 bits each). A 4 bits burst operation will occur entirely within one of the 512 groups beginning with the
column address supplied to the device during the read or write command (CA0 to CA9, CA11). The second, third
and fourth access will also occur within this group segment, however, the burst order is a function of the starting
address, and the burst sequence.
A new burst access must not interrupt the previous 4-bit burst operation. The minimum /CAS to /CAS delay is
defined by tCCD, and is a minimum of 2 clocks for read or write cycles.
Posted /CAS
Posted /CAS operation is supported to make command and data bus efficient for sustainable bandwidths in DDR2
SDRAM. In this operation, the DDR2 SDRAM allows a /CAS read or write command to be issued immediately after
the /RAS bank activate command (or any time during the /RAS-/CAS-delay time, tRCD, period). The command is
held for the time of the Additive Latency (AL) before it is issued inside the device. The Read Latency (RL) is
controlled by the sum of AL and the /CAS latency (CL). Therefore if a user chooses to issue a R/W command before
the tRCD (min), then AL (greater than 0) must be written into the EMRS. The Write Latency (WL) is always defined
as RL − 1 (read latency −1) where read latency is defined as the sum of additive latency plus /CAS latency (RL = AL
+ CL).
-1
1
ACT
READ
CK
Command
2
3
4
NOP
6
7
8
10
11
12
NOP
WL = RL – 1 = 4
CL = 3
u
od
≥ tRCD
9
WRIT
AL = 2
DQS, /DQS
5
Pr
0
/CK
RL = AL + CL = 5
DQ
out0 out1 out2 out3
≥ tRAC
in0 in1 in2 in3
Read Followed by a Write to the Same Bank
[AL = 2 and CL = 3, RL = (AL + CL) = 5, WL = (RL - 1) = 4]
-1
0
1
2
3
/CK
CK
ACT
NOP
AL = 0
READ
5
NOP
CL = 3
6
7
8
WRIT
≥ tRCD
RL = AL + CL = 3
out0 out1 out2 out3
≥ tRAC
Read Followed by a Write to the Same Bank
[AL = 0 and CL = 3, RL = (AL + CL) = 3, WL = (RL - 1) = 2]
Preliminary Data Sheet E0948E30 (Ver. 3.0)
52
10
NOP
WL = RL – 1 = 2
DQS, /DQS
DQ
9
11
12
ct
Command
4
in0 in1 in2 in3
EDE2508ACSE, EDE2516ACSE
Burst Mode Operation
Burst mode operation is used to provide a constant flow of data to memory locations (write cycle), or from memory
locations (read cycle). The parameters that define how the burst mode will operate are burst sequence and burst
length. DDR2 SDRAM supports 4 bits burst and 8bits burst modes only. For 8 bits burst mode, full interleave
address ordering is supported, however, sequential address ordering is nibble based for ease of implementation.
The burst type, either sequential or interleaved, is programmable and defined by the address bit 3 (A3) of the MRS,
which is similar to the DDR-I SDRAM operation. Seamless burst read or write operations are supported.
Unlike DDR-I devices, interruption of a burst read or writes operation is limited to ready by Read or Write by Write at
the boundary of Burst 4. Therefore the burst stop command is not supported on DDR2 SDRAM devices.
L
EO
[Burst Length and Sequence]
Burst length
4
8
Starting address (A2, A1, A0) Sequential addressing (decimal)
Interleave addressing (decimal)
000
0, 1, 2, 3
0, 1, 2, 3
001
1, 2, 3, 0
1, 0, 3, 2
010
2, 3, 0, 1
2, 3, 0, 1
011
3, 0, 1, 2
3, 2, 1, 0
000
0, 1, 2, 3, 4, 5, 6, 7
0, 1, 2, 3, 4, 5, 6, 7
001
1, 2, 3, 0, 5, 6, 7, 4
1, 0, 3, 2, 5, 4, 7, 6
010
2, 3, 0, 1, 6, 7, 4, 5
2, 3, 0, 1, 6, 7, 4, 5
011
3, 0, 1, 2, 7, 4, 5, 6
3, 2, 1, 0, 7, 6, 5, 4
100
4, 5, 6, 7, 0, 1, 2, 3
4, 5, 6, 7, 0, 1, 2, 3
101
5, 6, 7, 4, 1, 2, 3, 0
5, 4, 7, 6, 1, 0, 3, 2
111
Pr
110
6, 7, 4, 5, 2, 3, 0, 1
6, 7, 4, 5, 2, 3, 0, 1
7, 4, 5, 6, 3, 0, 1, 2
7, 6, 5, 4, 3, 2, 1, 0
Note: Page length is a function of I/O organization and column addressing
8M bits × 8 organization (CA0 to CA9); Page Length = 1024 bits
4M bits × 16 organization (CA0 to CA8); Page Length = 512 bits
ct
u
od
Preliminary Data Sheet E0948E30 (Ver. 3.0)
53
EDE2508ACSE, EDE2516ACSE
Burst Read Command [READ]
The Burst Read command is initiated by having /CS and /CAS low while holding /RAS and /WE high at the rising
edge of the clock. The address inputs determine the starting column address for the burst. The delay from the start
of the command to when the data from the first cell appears on the outputs is equal to the value of the read latency
(RL). The data strobe output (DQS) is driven low 1 clock cycle before valid data (DQ) is driven onto the data bus.
The first bit of the burst is synchronized with the rising edge of the data strobe (DQS). Each subsequent data-out
appears on the DQ pin in phase with the DQS signal in a source synchronous manner.
The RL is equal to an additive latency (AL) plus /CAS latency (CL). The CL is defined by the mode register set
(MRS), similar to the existing SDR and DDR-I SDRAMs. The AL is defined by the extended mode register set
(EMRS).
L
EO
T0
T1
T2
T3
T4
T5
T6
T7
T8
T7
T8
/CK
CK
Command
READ
NOP
≤ tDQSCK
DQS, /DQS
CL = 3
RL = 3
DQ
out0 out1 out2 out3
T0
/CK
CK
T1
T2
READ
T3
T4
T5
T6
u
od
Command
Pr
Burst Read Operation (RL = 3, BL = 4 (AL = 0 and CL = 3))
NOP
≤ tDQSCK
DQS, /DQS
CL = 3
RL = 3
DQ
out0 out1 out2 out3 out4 out5 out6 out7
Burst Read Operation (RL = 3, BL = 8 (AL = 0 and CL = 3))
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
54
EDE2508ACSE, EDE2516ACSE
T0
T1
T2
T3
T4
T5
T6
T7
T8
/CK
CK
Command
Posted
READ
NOP
≤ tDQSCK
DQS, /DQS
AL = 2
CL = 3
L
EO
RL = 5
out0 out1 out2 out3
DQ
Burst Read Operation (RL = 5, BL = 4 (AL = 2, CL = 3))
T0
T1
T3
T4
T5
T6
T7
T8
T9
/CK
CK
Command
Posted
READ
Posted
WRIT
NOP
NOP
NOP
tRTW (Read to Write = 4 clocks)
DQS, /DQS
Pr
RL = 5
WL = RL - 1 = 4
out0 out1 out2 out3
DQ
in0
in1
in2
in3
Burst Read Followed by Burst Write (RL = 5, WL = RL-1 = 4, BL = 4)
T0
T1
/CK
CK
Command
Posted
READ
NOP
A
T2
u
od
The minimum time from the burst read command to the burst write command is defined by a read-to-write-turnaround-time, which is 4 clocks in the case of BL = 4 operation, 6 clocks in case of BL =8 operation.
T3
T4
Posted
READ
T5
T6
T7
T8
NOP
B
DQS, /DQS
CL = 3
RL = 5
out
A0
DQ
ct
AL = 2
out
A1
out
A2
Seamless Burst Read Operation (RL = 5, AL = 2, and CL = 3)
Preliminary Data Sheet E0948E30 (Ver. 3.0)
55
out
A3
out
B0
out
B1
out
B2
EDE2508ACSE, EDE2516ACSE
Enabling a read command at every other clock supports the seamless burst read operation. This operation is
allowed regardless of same or different banks as long as the banks are activated.
T0
T1
T2
READ
NOP
READ
T3
T4
T5
T6
T7
T8
T9
T10
T11
CK
/CK
Command
A
NOP
B
L
EO
DQS, /DQS
RL = 4
DQ
out
A0
out
A1
out
A2
out
A3
out
B0
out out
B1 B2
out
B3
out
B4
out
B5
out
B6
out
B7
Burst interrupt is only
allowed at this timing.
Burst Read Interrupt by Read
ct
u
od
Pr
Notes: 1. Read burst interrupt function is only allowed on burst of 8. burst interrupt of 4 is prohibited.
2. Read burst of 8 can only be interrupted by another read command. Read burst interruption by write
command or precharge command is prohibited.
3. Read burst interrupt must occur exactly two clocks after previous read command. any other read burst
interrupt timings are prohibited.
4. Read burst interruption is allowed to any bank inside DRAM.
5. Read burst with auto precharge enabled is not allowed to interrupt.
6. Read burst interruption is allowed by another read with auto precharge command.
7. All command timings are referenced to burst length set in the mode register. They are not referenced to
actual burst. For example, minimum read to precharge timing is AL + BL/2 where BL is the burst length
set in the mode register and not the actual burst (which is shorter because of interrupt).
Preliminary Data Sheet E0948E30 (Ver. 3.0)
56
EDE2508ACSE, EDE2516ACSE
Burst Write Command [WRIT]
The Burst Write command is initiated by having /CS, /CAS and /WE low while holding /RAS high at the rising edge of
the clock. The address inputs determine the starting column address. Write latency (WL) is defined by a read
latency (RL) minus one and is equal to (AL + CL −1). A data strobe signal (DQS) should be driven low (preamble)
one clock prior to the WL. The first data bit of the burst cycle must be applied to the DQ pins at the first rising edge
of the DQS following the preamble. The tDQSS specification must be satisfied for write cycles. The subsequent
burst bit data are issued on successive edges of the DQS until the burst length of 4 is completed. When the burst
has finished, any additional data supplied to the DQ pins will be ignored. The DQ Signal is ignored after the burst
write operation is complete. The time from the completion of the burst write to bank precharge is the write recovery
time (tWR).
L
EO
T0
T1
T2
T3
T4
T5
T6
T7
T9
/CK
CK
Command
WRIT
NOP
PRE
NOP
ACT
≤ tDQSS
DQS, /DQS
≥tWR
WL = RL –1 = 2
in0
DQ
in1
in2
≥tRP
in3
Pr
Completion of
the burst write
Burst Write Operation (RL = 3, WL = 2, BL = 4 tWR = 2 (AL=0, CL=3))
T0
T1
T2
/CK
T3
Command
WRIT
T6
T7
T8
PRE
NOP
≤ tDQSS
DQS, /DQS
≥tWR
WL = RL –1 = 2
DQ
T5
in0
in1
in2
T9
T11
u
od
CK
T4
in3
in4
in5
in6
≥tRP
ct
Burst Write Operation (RL = 3, WL = 2, BL = 8 (AL=0, CL=3))
57
ACT
in7
Completion of
the burst write
Preliminary Data Sheet E0948E30 (Ver. 3.0)
NOP
EDE2508ACSE, EDE2516ACSE
T0
T1
T2
T3
T4
T5
T6
T7
T9
/CK
CK
Posted
WRIT
Command
PRE
NOP
≤ tDQSS
DQS, /DQS
≥tWR
WL = RL −1 = 4
L
EO
in0
DQ
in1
in2
in3
Completion of
the burst write
Burst Write Operation (RL = 5, WL = 4, BL = 4 tWR = 3 (AL=2, CL=3))
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
/CK
CK
Write to Read = CL - 1 + BL/2 + tWTR (2) = 6
Command
Posted
READ
NOP
NOP
DQS, /DQS
CL = 3
Pr
AL = 2
WL = RL –1 = 4
RL = 5
>tWTR
=
in0
DQ
in1
in2
in3
out0
out1
Burst Write Followed by Burst Read (RL = 5, BL = 4, WL = 4, tWTR = 2 (AL=2, CL=3))
u
od
The minimum number of clock from the burst write command to the burst read command is CL - 1 + BL/2 + a write
to-read-turn-around-time (tWTR). This tWTR is not a write recovery time (tWR) but the time required to transfer the
4bit write data from the input buffer into sense amplifiers in the array.
T0
T1
T2
/CK
CK
Command
Posted
WRIT
A
NOP
Posted
WRIT
B
DQS, /DQS
T3
T4
T5
T6
T7
T8
NOP
in
A0
DQ
in
A1
in
A2
in
A3
ct
WL = RL − 1 = 4
in
B0
in
B1
in
B2
in
B3
Seamless Burst Write Operation (RL = 5, WL = 4, BL = 4)
Enabling a write command every other clock supports the seamless burst write operation. This operation is allowed
regardless of same or different banks as long as the banks are activated.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
58
EDE2508ACSE, EDE2516ACSE
T0
T1
T2
WRIT
NOP
WRIT
T3
T4
T5
T6
T7
T8
T9
T10
T11
CK
/CK
Command
A
NOP
B
DQS, /DQS
WL = 3
L
EO
in in in in
A0 A1 A2 A3
DQ
in
B0
in in in in in in
B1 B2 B3 B4 B5 B6
in
B7
Burst interrupt is only
allowed at this timing.
Write Interrupt by Write (WL = 3, BL = 8)
ct
u
od
Pr
Notes :1. Write burst interrupt function is only allowed on burst of 8. Burst interrupt of 4 is prohibited.
2. Write burst of 8 can only be interrupted by another write command. Write burst interruption by read
command or precharge command is prohibited.
3. Write burst interrupt must occur exactly two clocks after previous write command. Any other write burst
interrupt timings are prohibited.
4. Write burst interruption is allowed to any bank inside DRAM.
5. Write burst with auto precharge enabled is not allowed to interrupt.
6. Write burst interruption is allowed by another write with auto precharge command.
7. All command timings are referenced to burst length set in the mode register. They are not referenced to
actual burst. For example, minimum write to precharge timing is WL+BL/2+tWR where tWR starts with
the rising clock after the un-interrupted burst end and not from the end of actual burst end.
Preliminary Data Sheet E0948E30 (Ver. 3.0)
59
EDE2508ACSE, EDE2516ACSE
Write Data Mask
One write data mask (DM) pin for each 8 data bits (DQ) will be supported on DDR2 SDRAMs, Consistent with the
implementation on DDR-I SDRAMs. It has identical timings on write operations as the data bits, and though used in
a uni-directional manner, is internally loaded identically to data bits to insure matched system timing. DM is not used
during read cycles.
T1
T2
T3
T4
in
in
T5
Tn
DQS
L
EO
/DQS
DQ
in
in
in
in
in
in
in
DM
Write mask latency = 0
Data Mask Timing
[tDQSS(min.)]
/CK
CK
tWR
Pr
Command
WRIT
NOP
WL
tDQSS
DQS, /DQS
DQ
in2 in3
u
od
DM
in0
WL
[tDQSS(max.)]
DQS, /DQS
DQ
DM
tDQSS
in0
in2 in3
Data Mask Function, WL = 3, AL = 0 shown
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
60
EDE2508ACSE, EDE2516ACSE
Precharge Command [PRE]
The precharge command is used to precharge or close a bank that has been activated. The precharge command is
triggered when /CS, /RAS and /WE are low and /CAS is high at the rising edge of the clock. The precharge
command can be used to precharge each bank independently or all banks simultaneously. Three address bits A10,
BA0 and BA1 are used to define which bank to precharge when the command is issued.
[Bank Selection for Precharge by Address Bits]
BA0
BA1
Precharged Bank(s)
L
L
L
Bank 0 only
L
H
L
Bank 1 only
L
L
H
Bank 2 only
L
H
H
Bank 3 only
H
×
×
All banks 0 to 3
L
EO
A10
Remark: H: VIH, L: VIL, ×: VIH or VIL
Burst Read Operation Followed by Precharge
Minimum read to precharge command spacing to the same bank = AL + BL/2 clocks
For the earliest possible precharge, the precharge command may be issued on the rising edge that is
“Additive latency (AL) + BL/2 clocks” after a Read command. A new bank active (command) may be issued to the
same bank after the RAS precharge time (tRP). A precharge command cannot be issued until tRAS is satisfied.
T0
T1
T2
T3
T4
T5
T6
T7
T8
/CK
CK
Posted
READ
Pr
Command
NOP
PRE
NOP
ACT
NOP
AL + BL/2 clocks
DQS, /DQS
AL = 1
≥tRP
CL = 3
RL = 4
u
od
out0
DQ
≥tRAS
out1
out2
out3
Burst Read Operation Followed by Precharge (RL = 4, BL = 4 (AL=1, CL=3))
T0
T1
T2
/CK
CK
Command
Posted
READ
NOP
T3
T4
T5
T6
PRE
ACT
NOP
DQS, /DQS
≥ tRP
CL = 3
RL = 5
DQ
out0
out1
out2
out3
≥ tRAS(min.)
Burst Read Operation Followed by Precharge (RL = 5, BL = 4 (AL=2, CL=3))
Preliminary Data Sheet E0948E30 (Ver. 3.0)
61
T8
NOP
ct
AL + /BL2 clocks
AL = 2
T7
EDE2508ACSE, EDE2516ACSE
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
/CK
CK
Command
Posted
READ
NOP
PRE
NOP
NOP
ACT
AL + BL/2 Clocks
DQS, /DQS
≥ tRP
CL = 4
AL = 2
RL = 6
L
EO
out0
DQ
out1
out2
out3
out4
out5
out6
out7
≥ tRAS(min.)
Burst Read Operation Followed by Precharge (RL = 6 (AL=2, CL=4, BL=8))
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
62
EDE2508ACSE, EDE2516ACSE
Burst Write followed by Precharge
Minimum Write to Precharge Command spacing to the same bank = WL + BL/2 clocks + tWR
For write cycles, a delay must be satisfied from the completion of the last burst write cycle until the precharge
command can be issued. This delay is known as a write recovery time (tWR) referenced from the completion of the
burst write to the precharge command. No precharge command should be issued prior to the tWR delay, as DDR2
SDRAM allows the burst interrupt operation only Read by Read or Write by Write at the boundary of burst 4.
T0
T1
T2
T3
T4
T5
T6
T7
T8
/CK
L
EO
CK
Command
Posted
WRIT
NOP
PRE
≥ tWR
DQS, /DQS
WL = 3
DQ
in0
in1
in2
in3
Completion of
the burst write
Burst Write Followed by Precharge (WL = (RL-1) =3)
CK
Command
Posted
WRIT
Pr
T0
/CK
T1
T2
T3
T4
T5
T6
T7
NOP
WL = 4
in0
DQ
PRE
≥ tWR
u
od
DQS, /DQS
T9
in1
in2
in3
Completion of
the burst write
Burst Write Followed by Precharge (WL = (RL-1) = 4)
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
63
EDE2508ACSE, EDE2516ACSE
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T11
/CK
CK
Command
Posted
WRIT
PRE
NOP
≥ tWR
DQS, /DQS
WL = 4
L
EO
DQ
in0
in1
in2
in3
in4
in5
in6
in7
Completion of
the burst write
Burst Write Followed by Precharge (WL = (RL-1) = 4,BL= 8)
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
64
EDE2508ACSE, EDE2516ACSE
Auto Precharge Operation
L
EO
Before a new row in an active bank can be opened, the active bank must be precharged using either the precharge
command or the auto precharge function. When a read or a write command is given to the DDR2 SDRAM, the /CAS
timing accepts one extra address, column address A10, to allow the active bank to automatically begin precharge at
the earliest possible moment during the burst read or write cycle. If A10 is low when the read or write Command is
issued, then normal read or write burst operation is executed and the bank remains active at the completion of the
burst sequence. If A10 is high when the Read or Write Command is issued, then the auto precharge function is
engaged. During auto precharge, a read Command will execute as normal with the exception that the active bank
will begin to precharge on the rising edge which is /CAS latency (CL) clock cycles before the end of the read burst.
Auto precharge can also be implemented during Write commands. The precharge operation engaged by the Auto
precharge command will not begin until the last data of the burst write sequence is properly stored in the memory
array.
This feature allows the precharge operation to be partially or completely hidden during burst read cycles (dependent
upon /CAS latency) thus improving system performance for random data access. The /RAS lockout circuit internally
delays the Precharge operation until the array restore operation has been completed so that the auto precharge
command may be issued with any read or write command.
Burst Read with Auto Precharge [READA]
If A10 is high when a Read Command is issued, the Read with Auto Precharge function is engaged. The DDR2
SDRAM starts an auto Precharge operation on the rising edge which is (AL + BL/2) cycles later from the read with
AP command when tRAS (min) is satisfied. If tRAS (min.) is not satisfied at the edge, the start point of auto
precharge operation will be delayed until tRAS (min.) is satisfied. A new bank active (command) may be issued to
the same bank if the following two conditions are satisfied simultaneously.
(1) The /RAS precharge time (tRP) has been satisfied from the clock at which the auto precharge begins.
(2) The /RAS cycle time (tRC) from the previous bank activation has been satisfied.
CK
Command
A10 = 1
Posted
READ
Pr
T0
/CK
T1
T2
T3
T4
T5
T6
T7
NOP
ACT
Tn
NOP
ACT
AL + BL/2
u
od
DQS, /DQS
≥ tRP
AL = 2
CL = 3
RL = 5
DQ
out0 out1 out2 out3
tRC (min.)
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRC limit)
(RL = 5, BL = 4 (AL = 2, CL = 3, tRTP ≤ 2tCK))
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
65
EDE2508ACSE, EDE2516ACSE
T-1
T0
T1
T2
T3
T4
T5
T6
T7
Tn
/CK
CK
A10 = 1
Posted
READ
Command
NOP
ACT
≥ tRAS(min.)
DQS, /DQS
≥ tRP
CL = 3
AL = 2
L
EO
RL = 5
out0
DQ
out1
out2
out3
tRC (min.)
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRAS lockout case)
(RL = 5, BL = 4 (AL = 2, CL = 3))
T0
T1
T2
T3
T4
T5
T6
T7
T8
/CK
CK
Command
A10 = 1
Posted
READ
ACT
NOP
NOP
Pr
≥ tRAS(min.)
DQS, /DQS
tRP (min.)
AL = 2
CL = 3
RL = 5
out0
DQ
out2
out3
u
od
≥tRC
out1
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRP limit)
(RL = 5, BL = 4 (AL = 2, CL = 3, tRTP ≤ 2tCK))
T0
T1
T2
CK
/CK
A10 = 1
T4
T5
T6
T7
T8
NOP
READ
DQS, /DQS
CL = 3
T10
ACT
≥tRAS (min.)
AL = 2
T9
≥tRP
RL = 5
out0 out1 out2 out3 out4 out5 out6 out7
DQ
≥tRC
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank
(RL = 5, BL = 8 (AL = 2, CL = 3, tRTP ≤ 2tCK))
Preliminary Data Sheet E0948E30 (Ver. 3.0)
66
T11
ct
Command
T3
EDE2508ACSE, EDE2516ACSE
Burst Write with Auto Precharge [WRITA]
If A10 is high when a write command is issued, the Write with auto precharge function is engaged. The DDR2
SDRAM automatically begins precharge operation after the completion of the burst writes plus write recovery time
(tWR). The bank undergoing auto precharge from the completion of the write burst may be reactivated if the
following two conditions are satisfied.
(1) The data-in to bank activate delay time (tWR + tRP) has been satisfied.
(2) The /RAS cycle time (tRC) from the previous bank activation has been satisfied.
T0
T1
T2
T3
T4
T5
T6
T7
Tm
L
EO
/CK
CK
A10 = 1
Posted
WRIT
Command
NOP
ACT
DQS, /DQS
≥tWR
WL = RL –1 = 2
in0
DQ
in1
in2
≥ tRP
in3
tRC (min.)
Completion of the burst write
Auto precharge begins
Pr
Burst Write with Auto Precharge (tRC Limit) (WL = 2, tWR =2)
T0
T3
/CK
CK
Posted
WRIT
T5
T7
T8
T9
T10
NOP
NOP
DQS, /DQS
in0
in1
T11
ACT
tRP (min.)
tWR (min.)
WL = RL –1 = 4
DQ
T6
u
od
Command
A10 = 1
T4
in2
in3
≥ tRC
Completion of the burst write
Auto precharge begins
ct
Burst Write with Auto Precharge (tWR + tRP) (WL = 4, tWR =2, tRP=3)
Preliminary Data Sheet E0948E30 (Ver. 3.0)
67
EDE2508ACSE, EDE2516ACSE
T0
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
CK
/CK
A10 = 1
Command
NOP
WRIT
ACT
DQS, /DQS
WL = RL − 1 = 4
≥tWR
L
EO
in0
DQ
in1
in2
in3
in4
in5
in6
≥tRP
in7
≥tRC
Auto precharge begins
Burst Write with Auto Precharge Followed by an Activation to the Same Bank
(WL = 4, BL = 8, tWR = 2, tRP = 3)
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
68
EDE2508ACSE, EDE2516ACSE
Refresh Requirements
DDR2 SDRAM requires a refresh of all rows in any rolling 64ms interval. Each refresh is generated in one of two
ways: by an explicit automatic refresh command, or by an internally timed event in self-refresh mode. Dividing the
number of device rows into the rolling 64 ms interval defines the average refresh interval, tREFI, which is a guideline
to controllers for distributed refresh timing.
Automatic Refresh Command [REF]
L
EO
When /CS, /RAS and /CAS are held low and /WE high at the rising edge of the clock, the chip enters the automatic
refresh mode (REF). All banks of the DDR2 SDRAM must be precharged and idle for a minimum of the precharge
time (tRP) before the auto-refresh command (REF) can be applied. An address counter, internal to the device,
supplies the bank address during the refresh cycle. No control of the external address bus is required once this
cycle has started.
When the refresh cycle has completed, all banks of the DDR2 SDRAM will be in the precharged (idle) state. A delay
between the auto-refresh command (REF) and the next activate command or subsequent auto-refresh command
must be greater than or equal to the auto-refresh cycle time (tRFC).
To allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute refresh
interval is provided. A maximum of 8 refresh commands can be posted to any given DDR2 SDRAM, meaning that
the maximum absolute interval between any refresh command and the next Refresh command is 9 × tREFI.
T0
T1
T2
T3
/CK
CK
VIH
≥ tRP
CKE
PRE
Pr
Command
≥ tRFC
≥ tRFC
NOP
REF
REF
NOP
Any
Command
Automatic Refresh Command
ct
u
od
Preliminary Data Sheet E0948E30 (Ver. 3.0)
69
EDE2508ACSE, EDE2516ACSE
Self-Refresh Command [SELF]
L
EO
The DDR2 SDRAM device has a built-in timer to accommodate self-refresh operation. The self-refresh command is
defined by having /CS, /RAS, /CAS and CKE held low with /WE high at the rising edge of the clock.
ODT must be turned off before issuing self-refresh command, by either driving ODT pin low or using EMRS
command. Once the command is registered, CKE must be held low to keep the device in self-refresh mode.
When the DDR2 SDRAM has entered self-refresh mode all of the external signals except CKE, are “don’t care”.
The clock is internally disabled during self-refresh operation to save power. The user may change the external clock
frequency or halt the external clock one clock after Self-Refresh entry is registered, however, the clock must be
restarted and stable before the device can exit self-refresh operation. Once self-refresh exit command is registered,
a delay equal or longer than the tXSNR or tXSRD must be satisfied before a valid command can be issued to the
device. CKE must remain high for the entire self-refresh exit period tXSRD for proper operation. NOP or deselect
commands must be registered on each positive clock edge during the self-refresh exit interval. ODT should also be
turned off during tXSRD.
T0
T1
T2
T3
T4
T5
T6
Tm
Tn
tCK
tCH tCL
/CK
CK
≥ tXSNR
tRP*
≥ tXSRD
CKE
tIS
Pr
tIS
tAOFD
ODT
tIS
tIS tIH
u
od
Comand
SELF
NOP
NOP
NOP
Valid
Notes: 1. Device must be in the “All banks idle” state prior to entering self refresh mode.
2. ODT must be turned off tAOFD before entering self refresh mode, and can be turned on again
when tXSRD timing is satisfied.
3. tXSRD is applied for a read or a read with autoprecharge command.
4. tXSNR is applied for any command except a read or a read with autoprecharge command.
Self-Refresh Command
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
70
EDE2508ACSE, EDE2516ACSE
Power-Down [PDEN]
L
EO
Power-down is synchronously entered when CKE is registered low (along with NOP or deselect command). CKE is
not allowed to go low while mode register or extended mode register command time, or read or write operation is in
progress. CKE is allowed to go low while any of other operations such as row activation, precharge or auto
precharge, or auto-refresh is in progress, but power-down IDD spec will not be applied until finishing those
operations. Timing diagrams are shown in the following pages with details for entry into power-down.
The DLL should be in a locked state when power-down is entered. Otherwise DLL should be reset after exiting
power-down mode for proper read operation.
If power-down occurs when all banks are idle, this mode is referred to as precharge power-down; if power-down
occurs when there is a row active in any bank, this mode is referred to as active power-down. Entering power-down
deactivates the input and output buffers, excluding CK, /CK, ODT and CKE. Also the DLL is disabled upon entering
precharge power-down or slow exit active power-down, but the DLL is kept enabled during fast exit active powerdown. In power-down mode, CKE low and a stable clock signal must be maintained at the inputs of the DDR2
SDRAM, and ODT should be in a valid state but all other input signals are “Don’t Care”. CKE low must be
maintained until tCKE has been satisfied. Power-down duration is limited by 9 times tREFI of the device.
The power-down state is synchronously exited when CKE is registered high (along with a NOP or deselect
command). CKE high must be maintained until tCKE has been satisfied. A valid, executable command can be
applied with power-down exit latency, tXP, tXARD, or tXARDS, after CKE goes high. Power-down exit latency is
defined at AC Characteristics table of this data sheet.
CK
/CK
tIS tIH
tIS tIH
VALID
NOP
tIH
tIS
tIH
tIS tIH
CKE
NOP
VALID
Pr
Command
tCKE min
VALID
VALID
tXP, tXARD,
tXARDS
Enter power-down mode
tCKE min
VIH or VIL
Exit power-down mode
Read to Power-Down Entry
T0
T1
T2
Tx
Tx+1
Tx+2
/CK
CK
Command
CKE
DQS
/DQS
AL + CL
DQ
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
T2
Tx
out
0
Tx+1
out
1
out
2
Tx+2
out
3
BL=4
Tx+3
READ
Tx+4
Tx+5
Tx+6
ct
Command
T1
Tx+3
Read operation starts with a read command and
CKE should be kept high until the end of burst operation.
READ
VIH
T0
u
od
Power-Down
Tx+7
Tx+8
Tx+9
CKE should be kept high until the end of burst operation.
VIH
CKE
DQS
/DQS
AL + CL
DQ
out
0
out out
1
2
out
3
out
4
Preliminary Data Sheet E0948E30 (Ver. 3.0)
71
out out
5
6
out
7
BL=8
EDE2508ACSE, EDE2516ACSE
Read with Auto Precharge to Power-Down Entry
T0
T1
T2
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
/CK
CK
Command
READA
PRE
AL + BL/2
with tRTP = 7.5ns
and tRAS min. satisfied
BL=4
CKE
CKE should be kept high
until the end of burst operation.
DQS
L
EO
/DQS
AL + CL
DQ
T0
Command
T1
T2
READA
BL=8
Tx
out
0
out
1
Tx+1
out
2
Tx+2
out
3
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
Start internal precharge
AL + BL/2
with tRTP = 7.5ns
and tRAS min. satisfied
PRE
CKE should be kept high
until the end of burst operation.
CKE
DQS
/DQS
AL + CL
DQ
out
0
out
1
out
2
out
3
out
4
out out
5
6
out
7
Pr
Write to Power-Down Entry
T0
T1
/CK
CK
Tm+1 Tm+2
WRIT
CKE
Tm+3 Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
u
od
Command
Tm
tWTR
DQS
/DQS
WL
in
0
DQ
T0
Tm
Tm+1
WRIT
in
2
in
3
BL=4
Tm+2 Tm+3
Tm+4 Tm+5
Tx
CKE
tWTR
DQS
/DQS
WL
DQ
in
0
in
1
in
2
in
3
in
4
in
5
Preliminary Data Sheet E0948E30 (Ver. 3.0)
72
in
6
in
7
Tx+1
Tx+2
Tx+3
Tx+4
ct
Command
T1
in
1
BL=8
EDE2508ACSE, EDE2516ACSE
Write with Auto Precharge to Power-Down Entry
T0
T1
Tm
Tm+1
Tm+2
Tm+3
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
/CK
CK
Command
WRITA
PRE
CKE
WR*1
L
EO
DQS
/DQS
WL
in
0
DQ
T0
T1
Tm
in
1
Tm+1
in
2
BL=4
in
3
Tm+2
Tm+3
Tm+4
Tm+5
Tx
Tx+1
Tx+2
Tx+3
Tx+4
/CK
CK
Command
WRITA
CKE
DQS
/DQS
PRE
WR*1
WL
DQ
in
1
in
2
in
3
in
4
in
5
in
6
in
7
BL=8
Pr
in
0
Note: 1. WR is programmed through MRS
ct
u
od
Preliminary Data Sheet E0948E30 (Ver. 3.0)
73
EDE2508ACSE, EDE2516ACSE
Refresh command to Power-Down Entry
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
/CK
CK
Command
REF
CKE can go to low one clock after an auto-refresh command
CKE
L
EO
Active command to power-down entry
Command
ACT
CKE can go to low one clock after an active command
CKE
Pr
Precharge/Precharge all command to power-down entry
Command
PRE or
PALL
MRS/EMRS command to power-down entry
Command
MRS or
EMRS
ct
u
od
CKE can go to low one clock after a precharge or precharge all command
CKE
CKE
tMRD
Preliminary Data Sheet E0948E30 (Ver. 3.0)
74
EDE2508ACSE, EDE2516ACSE
Asynchronous CKE Low Event
DRAM requires CKE to be maintained high for all valid operations as defined in this data sheet. If CKE
asynchronously drops low during any valid operation DRAM is not guaranteed to preserve the contents of array. If
this event occurs, memory controller must satisfy DRAM timing specification tDELAY before turning off the clocks.
Stable clocks must exist at the input of DRAM before CKE is raised high again. DRAM must be fully re-initialized
(steps 4 through 13) as described in initialization sequence. DRAM is ready for normal operation after the
initialization sequence. See AC Characteristics table for tDELAY specification
Stable clocks
tCK
L
EO
/CK
CK
CKE
tDELAY
CKE asynchronously
drops low
Clocks can be
turned off after
this point
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
75
EDE2508ACSE, EDE2516ACSE
Input Clock Frequency Change during Precharge Power-Down
L
EO
DDR2 SDRAM input clock frequency can be changed under following condition:
DDR2 SDRAM is in precharged power-down mode. ODT must be turned off and CKE must be at logic low level.
A minimum of 2 clocks must be waited after CKE goes low before clock frequency may change. SDRAM input clock
frequency is allowed to change only within minimum and maximum operating frequency specified for the particular
speed grade. During input clock frequency change, ODT and CKE must be held at stable low levels.
Once input clock frequency is changed, stable new clocks must be provided to DRAM before precharge power-down
may be exited and DLL must be RESET via EMRS after precharge power-down exit. Depending on new clock
frequency an additional MRS command may need to be issued to appropriately set the WR, CL and soon. During
DLL relock period, ODT must remain off. After the DLL lock time, the DRAM is ready to operate with new clock
frequency.
Clock Frequency Change in Precharge Power-Down Mode
T0
T1
T2
NOP
NOP
T4
Tx
Tx+1
Ty
Ty+1
Ty+2 Ty+3
Ty+4
Tz
/CK
CK
Command
CKE
NOP
NOP
Frequency change
occurs here
DLL
RESET
NOP
Valid
200 clocks
ODT
tRP
tXP
Pr
tAOFD
Minmum 2 clocks
required before
changing frequency
ODT is off during
DLL RESET
Stable new clock
before power down exit
u
od
Burst Interruption
Interruption of a burst read or write cycle is prohibited.
No Operation Command [NOP]
The no operation command should be used in cases when the DDR2 SDRAM is in an idle or a wait state. The
purpose of the no operation command is to prevent the DDR2 SDRAM from registering any unwanted commands
between operations. A no operation command is registered when /CS is low with /RAS, /CAS, and /WE held high at
the rising edge of the clock. A no operation command will not terminate a previous operation that is still executing,
such as a burst read or write cycle.
Deselect Command [DESL]
The deselect command performs the same function as a no operation command. Deselect Command occurs when
/CS is brought high at the rising edge of the clock, the /RAS, /CAS, and /WE signals become don’t cares.
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
76
EDE2508ACSE, EDE2516ACSE
Package Drawing
60-ball FBGA
Solder ball: Lead free (Sn-Ag-Cu)
Unit: mm
10.0 ± 0.1
0.2 S B
10.5 ± 0.1
L
EO
INDEX MARK
0.2 S A
Pr
0.2 S
1.20 max.
S
0.35 ± 0.05
0.1 S
u
od
60-φ0.45 ± 0.05
φ0.12 M S A B
A
INDEX MARK
8.0
0.8
B
ct
1.6
6.4
0.8
ECA-TS2-0183-01
Preliminary Data Sheet E0948E30 (Ver. 3.0)
77
EDE2508ACSE, EDE2516ACSE
84-ball FBGA
Solder ball: Lead free (Sn-Ag-Cu)
Unit: mm
10.0 ± 0.1
0.2 S B
INDEX MARK
12.5 ± 0.1
L
EO
0.2 S A
Pr
0.2 S
1.20 max.
S
0.1 S
0.35 ± 0.05
u
od
φ0.12 M S A B
84-φ0.45 ± 0.05
A
INDEX MARK
11.2
0.8
B
ct
1.6
0.8
6.4
ECA-TS2-0174-01
Preliminary Data Sheet E0948E30 (Ver. 3.0)
78
EDE2508ACSE, EDE2516ACSE
Recommended Soldering Conditions
Please consult with our sales offices for soldering conditions of the EDE25XXACSE.
Type of Surface Mount Device
EDE2508ACSE: 60-ball FBGA < Lead free (Sn-Ag-Cu) >
EDE2516ACSE: 84-ball FBGA < Lead free (Sn-Ag-Cu) >
L
EO
ct
u
od
Pr
Preliminary Data Sheet E0948E30 (Ver. 3.0)
79
EDE2508ACSE, EDE2516ACSE
NOTES FOR CMOS DEVICES
1
PRECAUTION AGAINST ESD FOR MOS DEVICES
L
EO
Exposing the MOS devices to a strong electric field can cause destruction of the gate
oxide and ultimately degrade the MOS devices operation. Steps must be taken to stop
generation of static electricity as much as possible, and quickly dissipate it, when once
it has occurred. Environmental control must be adequate. When it is dry, humidifier
should be used. It is recommended to avoid using insulators that easily build static
electricity. MOS devices must be stored and transported in an anti-static container,
static shielding bag or conductive material. All test and measurement tools including
work bench and floor should be grounded. The operator should be grounded using
wrist strap. MOS devices must not be touched with bare hands. Similar precautions
need to be taken for PW boards with semiconductor MOS devices on it.
2
HANDLING OF UNUSED INPUT PINS FOR CMOS DEVICES
No connection for CMOS devices input pins can be a cause of malfunction. If no
connection is provided to the input pins, it is possible that an internal input level may be
generated due to noise, etc., hence causing malfunction. CMOS devices behave
differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed
high or low by using a pull-up or pull-down circuitry. Each unused pin should be connected
to VDD or GND with a resistor, if it is considered to have a possibility of being an output
pin. The unused pins must be handled in accordance with the related specifications.
3
STATUS BEFORE INITIALIZATION OF MOS DEVICES
Pr
u
od
Power-on does not necessarily define initial status of MOS devices. Production process
of MOS does not define the initial operation status of the device. Immediately after the
power source is turned ON, the MOS devices with reset function have not yet been
initialized. Hence, power-on does not guarantee output pin levels, I/O settings or
contents of registers. MOS devices are not initialized until the reset signal is received.
Reset operation must be executed immediately after power-on for MOS devices having
reset function.
CME0107
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
80
EDE2508ACSE, EDE2516ACSE
The information in this document is subject to change without notice. Before using this document, confirm that this is the latest version.
No part of this document may be copied or reproduced in any form or by any means without the prior
written consent of Elpida Memory, Inc.
Elpida Memory, Inc. does not assume any liability for infringement of any intellectual property rights
(including but not limited to patents, copyrights, and circuit layout licenses) of Elpida Memory, Inc. or
third parties by or arising from the use of the products or information listed in this document. No license,
express, implied or otherwise, is granted under any patents, copyrights or other intellectual property
rights of Elpida Memory, Inc. or others.
L
EO
Descriptions of circuits, software and other related information in this document are provided for
illustrative purposes in semiconductor product operation and application examples. The incorporation of
these circuits, software and information in the design of the customer's equipment shall be done under
the full responsibility of the customer. Elpida Memory, Inc. assumes no responsibility for any losses
incurred by customers or third parties arising from the use of these circuits, software and information.
[Product applications]
Elpida Memory, Inc. makes every attempt to ensure that its products are of high quality and reliability.
However, users are instructed to contact Elpida Memory's sales office before using the product in
aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment,
medical equipment for life support, or other such application in which especially high quality and
reliability is demanded or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury.
Pr
[Product usage]
Design your application so that the product is used within the ranges and conditions guaranteed by
Elpida Memory, Inc., including the maximum ratings, operating supply voltage range, heat radiation
characteristics, installation conditions and other related characteristics. Elpida Memory, Inc. bears no
responsibility for failure or damage when the product is used beyond the guaranteed ranges and
conditions. Even within the guaranteed ranges and conditions, consider normally foreseeable failure
rates or failure modes in semiconductor devices and employ systemic measures such as fail-safes, so
that the equipment incorporating Elpida Memory, Inc. products does not cause bodily injury, fire or other
consequential damage due to the operation of the Elpida Memory, Inc. product.
[Usage environment]
This product is not designed to be resistant to electromagnetic waves or radiation. This product must be
used in a non-condensing environment.
u
od
If you export the products or technology described in this document that are controlled by the Foreign
Exchange and Foreign Trade Law of Japan, you must follow the necessary procedures in accordance
with the relevant laws and regulations of Japan. Also, if you export products/technology controlled by
U.S. export control regulations, or another country's export control laws or regulations, you must follow
the necessary procedures in accordance with such laws or regulations.
If these products/technology are sold, leased, or transferred to a third party, or a third party is granted
license to use these products, that third party must be made aware that they are responsible for
compliance with the relevant laws and regulations.
M01E0107
ct
Preliminary Data Sheet E0948E30 (Ver. 3.0)
81