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W988D2FB Datasheet Preview

W988D2FB Datasheet

256Mb Mobile LPSDR

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W988D6FB / W988D2FB
256Mb Mobile LPSDR
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 4
2. FEATURES ................................................................................................................................. 4
3. ORDER INFORMATION ............................................................................................................. 4
4. BALL CONFIGURATION ............................................................................................................ 5
4.1 Ball Assignment: LPSDR x16 ......................................................................................... 5
4.2 Ball Assignment: LPSDR x32 ......................................................................................... 6
5. BALL DESCRIPTION.................................................................................................................. 7
5.1 Signal Description ........................................................................................................... 7
5.2 Addressing Table ............................................................................................................ 8
6. BLOCK DIAGRAM ...................................................................................................................... 9
7. FUNCTIONAL DESCRIPTION.................................................................................................. 10
7.1 Command Function ...................................................................................................... 10
7.1.1
Table 1. Truth Table (Note (1) and (2))...................................................................10
7.1.2
Functional Truth Table (See Note 1) ......................................................................11
7.1.3
Functional Truth Table for CKE ..............................................................................14
7.1.4
Bank Activate Command ........................................................................................15
7.1.5
Bank Precharge Command ....................................................................................15
7.1.6
Precharge All Command ........................................................................................15
7.1.7
Write Command......................................................................................................15
7.1.8
Write with Auto Precharge Command ....................................................................15
7.1.9
Read Command .....................................................................................................15
7.1.10
Read with Auto Precharge Command ....................................................................15
7.1.11
Extended Mode Register Set Command ................................................................16
7.1.12
Mode Register Set Command ................................................................................16
7.1.13
No-Operation Command ........................................................................................16
7.1.14
Burst Stop Command .............................................................................................16
7.1.15
Device Deselect Command ....................................................................................16
7.1.16
Auto Refresh Command .........................................................................................16
7.1.17
Self Refresh Entry Command .................................................................................16
7.1.18
Self Refresh Exit Command ...................................................................................17
7.1.19
Clock Suspend Mode Entry/Power Down Mode Entry Command ..........................17
7.1.20
Clock Suspend Mode Exit/Power Down Mode Exit Command ...............................17
7.1.21
Data Write/Output Enable, Data Mask/Output Disable Command..........................17
8. OPERATION ............................................................................................................................. 17
8.1 Read Operation............................................................................................................. 17
8.2 Write Operation............................................................................................................. 18
8.3 Precharge ..................................................................................................................... 18
8.3.1
Auto Precharge.......................................................................................................18
8.3.2
READ with auto precharge interrupted by a READ (with or without auto precharge)
19
Publication Release Date: Sep. 22, 2014
Revision: A01-006
-1-




Winbond

W988D2FB Datasheet Preview

W988D2FB Datasheet

256Mb Mobile LPSDR

No Preview Available !

W988D6FB / W988D2FB
8.3.3
READ with auto precharge interrupted by a WRITE (with or without auto precharge)
19
8.3.4
WRITE with auto precharge interrupted by a READ (with or without auto precharge)
20
8.3.5
WRITE with auto precharge interrupted by a WRITE (with or without auto
precharge) 20
8.4 Burst Termination.......................................................................................................... 21
8.5 Mode Register Operation.............................................................................................. 22
8.5.1
Burst Length field (A2~A0) .....................................................................................22
8.5.2
Addressing Mode Select (A3) .................................................................................22
8.5.3
Addressing Sequence for Sequential Mode ...........................................................22
8.5.4
Addressing Sequence for Interleave Mode.............................................................23
8.5.5
Addressing Sequence Example (Burst Length = 8 and Input Address is 13) .........23
8.5.6
Read Cycle CAS Latency = 3 .................................................................................23
8.5.7
CAS Latency field (A6~A4).....................................................................................24
8.5.8
Mode Register Definition ........................................................................................24
8.6 Extended Mode Register Description ........................................................................... 25
8.7 Simplified State Diagram .............................................................................................. 26
9. ELECTRICAL CHARACTERISTICS......................................................................................... 27
9.1 Absolute Maximum Ratings .......................................................................................... 27
9.2 Operating Conditions .................................................................................................... 27
9.3 Capacitance .................................................................................................................. 27
9.4 DC Characteristics ........................................................................................................ 28
9.5 Automatic Temperature Compensated Self Refresh Current Feature ......................... 28
9.6 AC Characteristics and Operating Condition................................................................ 29
9.6.1
AC Characteristics..................................................................................................29
9.6.2
AC Test Condition ..................................................................................................30
9.6.3
AC Latency Characteristics ....................................................................................31
10. CONTROL TIMING WAVEFORMS .......................................................................................... 32
10.1 Command Input Timing ................................................................................................ 32
10.2 Read Timing.................................................................................................................. 33
10.3 Control Timing of Input Data (x16)................................................................................ 34
10.4 Control Timing of Output Data (x16)............................................................................. 35
10.5 Control Timing of Input Data (x32)................................................................................ 36
10.6 Control Timing of Output Data (x32)............................................................................. 37
10.7 Mode Register Set (MRS) Cycle................................................................................... 38
10.8 Extended Mode register Set (EMRS) Cycle ................................................................. 39
11. OPERATING TIMING EXAMPLE ............................................................................................. 40
11.1 Interleaved Bank Read (Burst Length = 4, CAS Latency = 3)...................................... 40
11.2 Interleaved Bank Read (Burst Length = 4, CAS Latency = 3, Auto-precharge)........... 41
11.3 Interleaved Bank Read (Burst Length = 8, CAS Latency = 3)...................................... 42
11.4 Interleaved Bank Read (Burst Length = 8, CAS Latency = 3, Auto-precharge)........... 43
11.5 Interleaved Bank Write (Burst Length = 8) ................................................................... 44
11.6 Interleaved Bank Write (Burst Length = 8, Auto-precharge) ........................................ 45
11.7 Page Mode Read (Burst Length = 4, CAS Latency = 3) .............................................. 46
Publication Release Date: Sep. 22, 2014
Revision: A01-006
-2-


Part Number W988D2FB
Description 256Mb Mobile LPSDR
Maker Winbond
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