W956D6HB - Winbond

W956D6HB
64Mb Async./Burst/Sync./A/D MUX
1. GENERAL DESCRIPTION
Winbond x16 ADMUX products are high-speed, CMOS pseudo-static random access memory developed for lowpower, portable applications. The device has a DRAM core organized. These devices are a variation of the industrystandard Flash control interface, with a multiplexed address/data bus. The multiplexed address and data functionality
dramatically reduce the required signal count, and increase READ/WRITE bandwidth.
For seamless operation on a burst Flash bus, Winbond x16 ADMUX products incorporate a transparent self-refresh
mechanism. The hidden refresh requires no additional support from the system memory controller and has no
significant impact on device READ/WRITE performance.
Two user-accessible control registers define device operation. The bus configuration register (BCR) defines how the
Winbond x16 ADMUX device interacts with the system memory bus and is nearly identical to its counterpart on burst
mode Flash devices. The refresh configuration register (RCR) is used to control how refresh is performed on the
DRAM array. These registers are automatically loaded with default settings during power-up and can be updated
anytime during normal operation.
Special attention has been focused on standby current consumption during self refresh. Winbond x16 ADMUX
products include two mechanisms to minimize standby current. Partial-array refresh (PAR) enables the system to limit
refresh to only that part of the DRAM array that contains essential data. Temperature-compensated refresh (TCR)
uses an on-chip sensor to adjust the refresh rate to match the device temperature—the refresh rate decreases at
lower temperatures to minimize current consumption during standby. The system-configurable refresh mechanisms
are accessed through the RCR.
Winbond x16 ADMUX is compliant with the industry-standard CellularRAM 1.5 x16 A/D MUX.
2. FEATURES
•Supports asynchronous and burst operations
• VCC, VCCQ Voltages:
1.7V–1.95V VCC
1.7V–1.95V VCCQ
• Random access time: 70ns
• Burst mode READ and WRITE access:
4, 8, 16, or 32 words, or continuous burst
Burst wrap or sequential
Max clock rate: 133 MHz (tCLK = 7.5ns)
• Low power consumption:
Asynchronous READ: <25 mA
Continuous burst READ: <35 mA
Standby current: 250μA
 Low-power features
On-chip temperature compensated refresh (TCR)
Partial array refresh (PAR)
Deep power-down (DPD) mode
 Package: 54 Ball VFBGA
 16-bit multiplexed address/data bus
 Operating temperature range: -40°C~85°C

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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
3. ORDERING INFORMATION
Part Number
W956D6HBCX7I
VDD/VDDQ
1.8/1.8
I/O Width
x16
Type
Others
PKG CRAM A/D Mux,133MHz, -40°C~85°C
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
TABLE OF CONTENTS
1. GENERAL DESCRIPTION .......................................................................................................... 1
2. FEATURES.................................................................................................................................. 1
3. ORDERING INFORMATION ....................................................................................................... 2
4. PIN CONFIGURATION ................................................................................................................ 5
4.1 Ball Assignment .................................................................................................................................. 5
5. PIN DESCRIPTION ..................................................................................................................... 6
5.1 Signal Description ............................................................................................................................... 6
6. BLOCK DIAGRAM ...................................................................................................................... 7
7. INSTRUCTION SET .................................................................................................................... 8
7.1 Bus Operation ..................................................................................................................................... 8
8. FUNCTIONAL DESCRIPTION .................................................................................................... 9
8.1 Power Up Initialization ........................................................................................................................ 9
8.1.1 Power-Up Initialization Timing ................................................................................................................... 9
8.2 Bus Operating Modes ......................................................................................................................... 9
8.2.1 Asynchronous Modes ................................................................................................................................ 9
8.2.1.1 READ Operation (ADV# LOW) ....................................................................................................................... 10
8.2.1.2 WRITE Operation (ADV# LOW) ..................................................................................................................... 10
8.2.2 Burst Mode Operation.............................................................................................................................. 11
8.2.2.1 Burst Mode READ (4-word burst) ................................................................................................................... 11
8.2.2.2 Burst Mode WRITE (4-word burst) ................................................................................................................. 12
8.2.2.3 Refresh Collision During Variable-Latency READ Operation ......................................................................... 13
8.2.3 Mixed-Mode Operation ............................................................................................................................ 14
8.2.4 WAIT Operation ....................................................................................................................................... 14
8.2.4.1 Wired-OR WAIT Configuration ....................................................................................................................... 14
8.2.5 LB#/ UB# Operation................................................................................................................................. 15
8.3 Low Power Operation ....................................................................................................................... 15
8.3.1 Standby Mode Operation ......................................................................................................................... 15
8.3.2 Temperature Compensated Refresh ....................................................................................................... 15
8.3.3 Partial-Array Refresh ............................................................................................................................... 15
8.3.4 Deep Power-Down Operation .................................................................................................................. 15
8.4 Registers ........................................................................................................................................... 16
8.4.1 Access Using CRE .................................................................................................................................. 16
8.4.1.1 Configuration Register WRITE Asynchronous Mode Followed by READ Operation ...................................... 17
8.4.1.2 Configuration Register WRITE Synchronous Mode Followed by READ Operation ........................................ 18
8.4.1.3 Register READ Asynchronous Mode Followed by READ ARRAY Operation ................................................. 19
8.4.1.4 Register READ Synchronous Mode Followed by READ ARRAY Operation ................................................... 20
8.4.2 Software Access ...................................................................................................................................... 21
8.4.2.1 Load Configuration Register ........................................................................................................................... 21
8.4.2.2 Read Configuration Register .......................................................................................................................... 22
8.4.3 Bus Configuration Register ...................................................................................................................... 22
8.4.3.1 Bus Configuration Register Definition............................................................................................................. 23
8.4.3.2 Burst Length (BCR[2:0]) Default = Continuous Burst ..................................................................................... 24
8.4.3.3 Burst Wrap (BCR[3]) Default = No Wrap ........................................................................................................ 24
8.4.3.4 Sequence and Burst Length ........................................................................................................................... 25
8.4.3.5 Drive Strength (BCR[5:4]) Default = Outputs Use Half-Drive Strength ........................................................... 26
8.4.3.6 Table of Drive Strength ................................................................................................................................... 26
8.4.3.7 WAIT Configuration. (BCR[8]) ........................................................................................................................ 26
8.4.3.8 WAIT Polarity (BCR[10])................................................................................................................................. 26
8.4.3.9 WAIT Configuration During Burst Operation ................................................................................................... 27
8.4.3.10 Latency Counter (BCR[13:11]) Default = Three Clock Latency .................................................................... 27
8.4.3.11 Initial Access Latency (BRC[14]) Default = Variable ..................................................................................... 27
8.4.3.12 Allowed Latency Counter Settings in Variable Latency Mode ....................................................................... 27
8.4.3.13 Latency Counter (Variable Initial Latency, No Refresh Collision) .................................................................. 28
8.4.3.14 Allowed Latency Counter Settings in Fixed Latency Mode ........................................................................... 28
8.4.3.15 Latency Counter (Fixed Latency) ................................................................................................................. 29
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.16 Operating Mode (BCR[15]) ........................................................................................................................... 29
8.4.4 Refresh Configuration Register ............................................................................................................... 29
8.4.4.1 Refresh Configuration Register Mapping ....................................................................................................... 30
8.4.4.2 Partial Array Refresh (RCR[2:0]) Default = Full Array Refresh ....................................................................... 30
8.4.4.3 Address Patterns for PAR (RCR [4] = 1)......................................................................................................... 31
8.4.4.4 Deep Power-Down (RCR[4]) Default = DPD Disabled ................................................................................... 31
8.4.5 Device Identification Register .................................................................................................................. 31
8.4.5.1 Device Identification Register Mapping .......................................................................................................... 31
9. ELECTRICAL CHARACTERISTIC ........................................................................................... 32
9.1 Absolute Maximum DC, AC Ratings ................................................................................................. 32
9.2 Electrical Characteristics and Operating Conditions ......................................................................... 32
9.3 Deep Power-Down Specifications .................................................................................................... 33
9.4 Partial Array Self Refresh Standby Current ...................................................................................... 33
9.5 Capacitance ...................................................................................................................................... 33
9.6 AC Input-Output Reference Wave form ............................................................................................ 33
9.7 AC Output Load Circuit ..................................................................................................................... 33
10. TIMING REQUIRMENTS ......................................................................................................... 34
10.1 Read, Write Timing Requirements .................................................................................................. 34
10.1.1 Asynchronous READ Cycle Timing Requirements ............................................................................... 34
10.1.2 Burst READ Cycle Timing Requirements .............................................................................................. 35
10.1.3 Asynchronous WRITE Cycle Timing Requirements .............................................................................. 36
10.1.4 Burst WRITE Cycle Timing Requirements ............................................................................................ 37
10.2 TIMING DIAGRAMS ....................................................................................................................... 38
10.2.1 Initialization Period................................................................................................................................. 38
10.2.2 DPD Entry and Exit Timing Parameters ................................................................................................ 38
10.2.3 Initialization and DPD Timing Parameters ............................................................................................. 38
10.2.4 Asynchronous READ ............................................................................................................................. 39
10.2.5 Single Access Burst READ Operation - Variable Latency..................................................................... 40
10.2.6 4 - Word Burst READ Operation-Variable Latency ............................................................................... 41
10.2.7 Single-Access Burst READ Operation-Fixed Latency ........................................................................... 42
10.2.8 4 - Word Burst READ Operation-Fixed Latency .................................................................................... 43
10.2.9 Burst READ Terminate at End-of-Row (Wrap Off) ................................................................................ 44
10.2.10 Burst READ Row Boundary Crossing ................................................................................................. 45
10.2.11 Asynchronous WRITE ......................................................................................................................... 46
10.2.12 Burst WRITE Operation—Variable Latency Mode .............................................................................. 47
10.2.13 Burst WRITE Operation-Fixed Latency Mode ..................................................................................... 48
10.2.14 Burst WRITE Terminate at End of Row (Wrap Off) ............................................................................. 49
10.2.15 Burst WRITE Row Boundary Crossing ................................................................................................ 50
10.2.16 Burst WRITE Followed by Burst READ ............................................................................................... 51
10.2.17 Asynchronous WRITE Followed by Burst READ ................................................................................ 52
10.2.18 Burst READ Followed by Asynchronous WRITE ................................................................................ 53
10.2.19 Asynchronous WRITE Followed by Asynchronous READ .................................................................. 54
11. PACKAGE DESCRIPTION...................................................................................................... 55
11.1 Package Dimension ........................................................................................................................ 55
12. REVISION HISTORY ............................................................................................................... 56
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
4. PIN CONFIGURATION
4.1 Ball Assignment
1
2
3
4
5
6
A
LB#
OE#
NC
NC
NC
CRE
B
ADQ8
UB#
NC
NC
CE#
ADQ0
C
ADQ9
ADQ10
NC
NC
ADQ1
ADQ2
D
VSSQ
ADQ11
A17
NC
ADQ3
VCC
E
VCCQ
ADQ12
A21
A16
ADQ4
VSS
F
ADQ14
ADQ13
NC
NC
ADQ5
ADQ6
G
ADQ15
A19
NC
NC
WE#
ADQ7
H
A18
NC
NC
NC
NC
A20
J
WAIT
CLK
ADV#
NC
NC
NC
(Top View) Pin Configuration
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
5. PIN DESCRIPTION
5.1 Signal Description
Symbol
Type
A[max:16]
Input
Description
Address inputs: Inputs for addresses during READ and WRITE operations. Addresses are
internally latched during READ and WRITE cycles. The address lines are also used to define
the value to be loaded into the BCR or the RCR. A[max:16]=A[21:16] (64Mb)
Clock: Synchronizes the memory to the system operating frequency during synchronous
CLK
(Note 1)
Input
operations. When configured for synchronous operation, the address is latched on the first
rising CLK edge when ADV# is active. CLK must be static (HIGH or LOW) during
asynchronous access READ and WRITE operations when burst mode is enabled.
ADV#
(Note 1)
Input
Address valid: Indicates that a valid address is present on the address inputs. Addresses are
latched on the rising edge of ADV# during asynchronous READ and WRITE operations.
Control register enable: When CRE is HIGH, WRITE operations load the RCR or BCR, and
CRE
Input
CE#
Input
OE#
Input
WE#
Input
LB#
Input
Lower byte enable. DQ[7:0]
UB#
Input
Upper byte enable. DQ[15:8]
READ operations access the RCR, BCR, or DIDR.
Chip enable: Activates the device when LOW. When CE# is HIGH, the device is disabled and
goes into standby mode.
Output enable: Enables the output buffers when LOW. When OE# is HIGH, the output buffers
are disabled.
Write enable: Determines if a given cycle is a WRITE cycle. If WE# is LOW, the cycle is a
WRITE to either a configuration register or to the memory array.
Address/data I/Os: These pins are a multiplexed address/data bus. As inputs for addresses,
A/DQ[15:0]
Input/Output
these pins behave as A[15:0]. A[0] is the LSB of the 16-bit word address within the
CellularRAM device. Address, RCR, and BCR values are loaded with ADV# LOW. Data is
input or output when ADV# is HIGH.
WAIT: Provides data-valid feedback during burst READ and WRITE operations. WAIT is used
WAIT
(Note 1)
Output
to arbitrate collisions between refresh and READ/WRITE operations. WAIT is also asserted at
the end of a row unless wrapping within the burst length. WAIT should be ignored during
asynchronous operations. WAIT is High-Z when CE# is HIGH.
NC
—
VCC
Supply
Device power supply: Power supply for device core operation.
VCCQ
Supply
I/O power supply: Power supply for input/output buffers.
VSS
Supply
VSS must be connected to ground.
Reserved for future use.
VSSQ
Supply
VSSQ must be connected to ground.
Notes: 1.When using asynchronous mode exclusively, CLK can be tied to VSSQ or VCCQ . WAIT should be ignored during
asynchronous mode operations.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
6. BLOCK DIAGRAM
A[max:16]
Address Decode
Logic
DRAM
Memory
Refresh Configuration
Register (RCR)
Array
Input /
Output
MUX
and
Buffers
A/DQ [7:0]
Internal
External
A/DQ [15:8]
Device ID Register
(DIDR)
Bus Configuration
Register (BCR)
CE#
WE#
OE#
CLK
ADV#
CRE
WAIT
LB#
UB#
Control
Logic
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
7. INSTRUCTION SET
7.1 Bus Operation
Asynchronous
Mode BCR[15] =
1 (default)
CE#
OE#
WE#
CRE
LB#/
UB#
WAIT*2
A/DQ[15:0]*3
Notes
X
L
L
H
L
L
Low-Z
Data out
4
Active
X
L
X
L
L
L
High-Z
Data in
4
Standby
H or L
X
H
X
X
L
X
High-Z
High-Z
5, 6
Idle
X
X
L
X
X
L
X
Low-Z
X
4, 6
Active
X
L
H
L
H
X
Low-Z
High-Z
Active
X
L
L
H
H
L
Low-Z
Config. reg. out
Power
CLK
Read
Active
Write
Standby
No operation
Configuration
register WRITE
Configuration
register READ
DPD
Deep power-
ADV#
X
X
H
X
X
X
X
High-Z
High-Z
10
Power
CLK*1
ADV#
CE#
OE#
WE#
CRE
LB#/
UB#
WAIT*2
A/DQ[15:0]*3
Notes
Read
Active
H or L
L
L
H
L
L
Low-Z
Data out
4, 7
Write
Active
H or L
L
X
L
L
L
High-Z
Data in
4
Standby
H or L
X
H
X
X
L
X
High-Z
High-Z
5, 6
Idle
H or L
X
L
X
X
L
X
Low-Z
X
4, 6
Burst Mode
BCR[15] = 0
Standby
No operation
down
Initial burst READ
Active
L
L
X
H
L
L
Low-Z
Address
4, 8
Initial burst WRITE
Active
L
L
H
L
L
X
Low-Z
Address
4, 8
Burst continue
Active
H
L
X
X
X
L
Low-Z
Active
L
L
H
L
H
X
Low-Z
High-Z
8, 9
Active
L
L
L
H
H
L
Low-Z
Config. reg. out
8, 9
X
H
X
X
X
X
High-Z
High-Z
10
Configuration
register WRITE
Configuration
register READ
DPD
Deep powerdown
L
Data in or Data
out
4, 8
Notes: 1.With burst mode enabled, CLK must be static (HIGH or LOW) during asynchronous READs and asynchronous WRITEs and to achieve
standby power during standby mode.
2.The WAIT polarity is configured through the bus configuration register (BCR[10]).
3.When LB# and UB# are in select mode (LOW), DQ[15:0] are enabled. When only LB# is in select mode, DQ[7:0] are enabled. When only
UB# is in the select mode, DQ[15:8] are enabled.
4.The device will consume active power in this mode whenever addresses are changed.
5.When the device is in standby mode, address inputs and data inputs/outputs are internally isolated from any external influence.
6.VIN = VCCQ or 0V; all device balls must be static (unswitched) in order to achieve standby current.
7.When the BCR is configured for synchronous mode, synchronous READ and WRITE and asynchronous WRITE and READ are supported.
8.Burst mode operation is initialized through the bus configuration register (BCR[15]).
9.Initial cycle. Following cycles are the same as BURST CONTINUE. CE# must stay LOW for the equivalent of a single-wordburst (as
indicated by WAIT).
10. DPD is initiated when CE# transitions from LOW to HIGH after writing RCR[4] to 0. DPD is maintained until CE# transitions from HIGH to
LOW.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8. FUNCTIONAL DESCRIPTION
In general, ADMUX PSRAM devices are high-density alternatives to SRAM and Pseudo SRAM products, popular in
low-power, portable applications. Both devices implement a multiplexed address/data bus. This multiplexed
configuration supports greater bandwidth through the x16 data bus, yet still reduces the required signal count. The
ADMUX PSRAM bus interface supports both asynchronous and burst mode transfers.
8.1 Power Up Initialization
ADMUX PRAM products include an on-chip voltage sensor used to launch the power-up initialization process.
Initialization will configure the BCR and the RCR with their default settings. VCC and VCCQ must be applied
simultaneously. When they reach a stable level at or above 1.7V, the device will require 150μs to complete its selfinitialization process. During the initialization period, CE# should remain HIGH. When initialization is complete, the
device is ready for normal operation.
8.1.1 Power-Up Initialization Timing
Vcc=1.7v
Vcc
VccQ
tpu>=150us
Device Initialization
Device ready for
normal operation
8.2 Bus Operating Modes
This asynchronous/burst ADMUX PSRAM products incorporate a burst mode interface found on Flash products
targeting low-power, wireless applications. This bus interface supports asynchronous, and burst mode read and write
transfers. The specific interface supported is defined by the value loaded into the BCR.
8.2.1 Asynchronous Modes
Using industry-standard SRAM control signals (CE#, ADV#, OE#, WE#, and LB#/UB#). READ operations are initiated
by bringing CE#, ADV#, and LB#/UB# LOW while keeping OE# and WE# HIGH, and driving the address onto the
A/DQ bus. ADV# is taken HIGH to capture the address, and OE# is taken LOW. Valid data will be driven out of the
I/Os after the specified access time has elapsed.
WRITE operations occur when CE#, ADV#, WE#, and LB#/UB# are driven LOW with the address on the A/DQ bus.
ADV# is taken HIGH to capture the address, then the WRITE data is driven onto the bus. During asynchronous
WRITE operations, the OE# level is a ―Don't Care,‖ and WE# will override OE#; however, OE# must be HIGH while
the address is driven onto the A/DQ bus. The data to be written is latched on the rising edge of CE#, WE#, UB#, or
LB# (whichever occurs first).
During asynchronous operation with burst mode enabled, the CLK input must be held static (LOW). WAIT will be
driven during asynchronous READs, and its state should be ignored. WE# LOW time must be limited to tCEM.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.2.1.1 READ Operation (ADV# LOW)
A[max:16]
Address
CE#
OE#
WE#
A/DQ[15:0]
Address
High- Z
DATA
ADV#
LB#/UB#
DON’T CARE
8.2.1.2 WRITE Operation (ADV# LOW)
A[max:16]
Address
CE#
OE#
<tCEM
WE#
A/DQ[15:0]
Address
DATA
ADV#
LB#/UB#
DON’T CARE
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.2.2 Burst Mode Operation
Burst mode operations enable high-speed synchronous READ and WRITE operations. Burst operations consist of a
multi-clock sequence that must be performed in an ordered fashion. .After CE# goes LOW, the address to access is
latched on the first CLK edge after ADV# LOW. During this first clock rising edge, WE# indicates whether the
operation is going to be a READ (WE# = HIGH) or WRITE (WE# =LOW).
8.2.2.1 Burst Mode READ (4-word burst)
CLK
A[max:16]
Valid
address
ADV#
Latency Code 2(3 clocks)
CE#
OE#
WE#
LB#/UB#
A/DQ[15:0]
Valid
address
D0
D1
D2
D3
WAIT
READ burst identified
(WE#=HIGH)
Invalid
Don’t Care
Undefined
Note : Non-default BCR settings for burst mode READ (4-word burst): fixed or variable latency, Latency code 2 (3 clocks), WAIT
active Low, WAIT asserted during delay. Diagram is representative of variable latency with no refresh collision or fixedlatency access.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.2.2.2 Burst Mode WRITE (4-word burst)
CLK
A[max:16]
Valid
address
ADV#
Latency Code 2(3 clocks)
CE#
OE#
WE#
LB#/UB#
A/DQ[15:0]
Valid
address
D0
D1
D2
D3
WAIT
WRITE burst identified
(WE#=LOW)
Don’t Care
Note : Non-default BCR settings for burst mode WRITE (4-word burst) : fixed or variable latency , latency code 2(3 clocks) ,
WAIT active LOW , WAIT asserted during delay.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
The size of a burst can be specified in the BCR either as a fixed length or continuous. Fixed-length bursts consist of 4,
8, 16, or 32 words. Continuous bursts have the ability to start at a specified address and burst to the end of the
address. It goes back to the first address and continues to burst when continuous bursts meet the end of address.
The latency count stored in the BCR defines the number of clock cycles that elapse before the initial data value is
transferred between the processor and ADMUX PSRAM device. The initial latency for READ operations can be
configured as fixed or variable (WRITE operations always use fixed latency). Variable latency allows the ADMUX
PSRAM to be configured for minimum latency at high clock frequencies, but the controller must monitor WAIT to
detect any conflict with refresh cycles.
Fixed latency outputs the first data word after the worst-case access delay, including allowance for refresh collisions.
The initial latency time and clock speed determine the latency count setting. Fixed latency is used when the controller
cannot monitor WAIT. Fixed latency also provides improved performance at lower clock frequencies.
The WAIT output asserts when a burst is initiated, and de-asserts to indicate when data is to be transferred into (or out
of) the memory. WAIT will again be asserted at the boundary of the row, unless wrapping within the burst length. With
wrap off, the ADMUX PSRAM device will restore the previous row’s data and access the next row, WAIT will be deasserted, and the burst can continue across the row boundary. If the burst is to terminate at the row boundary, CE#
must go HIGH within 2 clocks of the last data. CE# must go HIGH before any clock edge following the last word of a
defined-length burst WRITE.
The CE# LOW time is limited by refresh considerations. CE# must not stay LOW longer than tCEM. If a burst
suspension will cause CE# to remain LOW for longer than tCEM, CE# should be taken HIGH and the burst restarted
with a new CE# LOW/ADV# LOW cycle.
8.2.2.3 Refresh Collision During Variable-Latency READ Operation
CLK
A[max:16]
VIH
VIL
VIH
VIL
ADV#
VIH
VIL
CE#
VIH
VIL
OE#
VIH
VIL
WE#
VIH
VIL
LB#/UB#
VIH
VIL
A/DQ[15:0]
VIH
VIL
Valid
Address
VOH
WAIT
VOH
VOL
Valid
Address
High-z
D0
D1
D2
D3
VOL
Additional WAIT satates inserted to allow refresh completion
Undefined
Don’t Care
Note : Non-default BCR settings for refresh collision during variable-latency READ operation : latency code 2 (3 clocks) , WAIT
active LOW , WAIT asserted during delay.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.2.3 Mixed-Mode Operation
The device supports a combination of synchronous WRITE / READ and asynchronous WRITE / READ operations
when the BCR is configured for synchronous operation. The asynchronous WRITE operations require that the clock
(CLK) remain static (HIGH or LOW) during the entire sequence. The ADV# signal can be used to latch the target
address, or it can remain LOW during the entire WRITE operation. CE# can remain LOW when transitioning between
mixed-mode operations with fixed latency enabled; however, the CE# LOW time must not exceed tCEM. Mixed-mode
operation facilitates a seamless interface to legacy burst mode Flash memory controllers.
8.2.4 WAIT Operation
The WAIT output on a ADMUX PSRAM device is typically connected to a shared, system level WAIT signal. The
shared WAIT signal is used by the processor to coordinate transactions with multiple memories on the synchronous
bus.
8.2.4.1 Wired-OR WAIT Configuration
CellularRAM
WAIT
External
Pull-Up/Pull-Down
Resistor
READY
Processor
WAIT
WAIT
Other
Device
Other
Device
When a burst READ or WRITE operation has been initiated, WAIT goes active to indicate that the ADMUX PSRAM
device requires additional time before data can be transferred. For READ operations, WAIT will remain active until
valid data is output from the device. For WRITE operations, WAIT will indicate to the memory controller when data will
be accepted into the ADMUX PSRAM device. When WAIT transitions to an inactive state, the data burst will progress
on successive clock edges.
During a burst cycle, CE# must remain asserted until the first data is valid. Bringing CE# HIGH during this initial
latency may cause data corruption.
When using variable initial access latency (BCR[14] = 0), the WAIT output performs an arbitration role for burst READ
operations launched while an on-chip refresh is in progress. If a collision occurs, WAIT is asserted for additional clock
cycles until the refresh has completed. When the refresh operation has completed, the burst READ operation will
continue normally.
WAIT is also asserted when a continuous READ or WRITE burst crosses a row boundary. The WAIT assertion allows
time for the new row to be accessed.
WAIT will be asserted after OE# goes LOW during asynchronous READ operations. WAIT will be High-Z during
asynchronous WRITE operations. WAIT should be ignored during all asynchronous operations.
By using fixed initial latency (BCR[14] = 1), this ADMUX PSRAM device can be used in burst mode without monitoring
the WAIT signal. However, WAIT can still be used to determine when valid data is available at the start of the burst
and at the end of the row. If WAIT is not monitored, the controller must stop burst accesses at row boundaries on its
own.
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Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.2.5 LB#/ UB# Operation
The LB# enable and UB# enable signals support byte-wide data WRITEs. During WRITE operations, any disabled
bytes will not be transferred to the RAM array and the internal value will remain unchanged. During an asynchronous
WRITE cycle, the data to be written is latched on the rising edge of CE#, WE#, LB#, or UB#, whichever occurs first.
LB# and UB# must be LOW during READ cycles.
When both the LB# and UB# are disabled (HIGH) during an operation, the device will disable the data bus from
receiving or transmitting data. Although the device will seem to be deselected, it remains in an active mode as long as
CE# remains LOW.
8.3 Low Power Operation
8.3.1 Standby Mode Operation
During standby, the device current consumption is reduced to the level necessary to perform the DRAM refresh
operation. Standby operation occurs when CE# is HIGH. The device will enter a reduced power state upon completion
of a READ or WRITE operation, or when the address and control inputs remain static for an extended period of time.
This mode will continue until a change occurs to the address or control inputs.
8.3.2 Temperature Compensated Refresh
Temperature-compensated refresh (TCR) allows for adequate refresh at different temperatures. This ADMUX
PSRAM device includes an on-chip temperature sensor that automatically adjusts the refresh rate according to the
operating temperature. The device continually monitors the temperature to select an appropriate self-refresh rate.
8.3.3 Partial-Array Refresh
Partial-array refresh (PAR) restricts refresh operation to a portion of the total memory array. This feature enables the
device to reduce standby current by refreshing only that part of the memory array required by the host system. The
refresh options are full array, one-half array, one-quarter array, one-eighth array, or none of the array. The mapping of
these partitions can start at either the beginning or the end of the address map . READ and WRITE operations to
address ranges receiving refresh will not be affected. Data stored in addresses not receiving refresh will become
corrupted. When additional portions of the array need to be re-enabled, the new portions are available immediately
after the completion of the WRITE cycle that updates the RCR with the new configuration.
8.3.4 Deep Power-Down Operation
Deep power-down (DPD) operation disables all refresh-related activity. This mode is used if the system does not
require the storage provided by the ADMUX PSRAM device. Any stored data will become corrupted when DPD is
enabled. When refresh activity has been re-enabled, the ADMUX PSRAM device will require 150μs to perform an
initialization procedure before normal operations can resume. During this 150μs period, the current consumption will
be higher than the specified standby levels, but considerably lower than the active current specification.
DPD can be enabled by writing to the RCR using CRE or the software access sequence; DPD starts when CE# goes
HIGH. DPD is disabled the next time CE# goes LOW and stays LOW for at least 10μs.
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Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4 Registers
Two user-accessible configuration registers define the device operation. The bus configuration register (BCR) defines
how the ADMUX PSRAM interacts with the system memory bus and is nearly identical to its counterpart on burst
mode Flash devices. The refresh configuration register (RCR) is used to control how refresh is performed on the
DRAM array. These registers are automatically loaded with default settings during power-up, and can be updated any
time the devices are operating in a standby state.
A DIDR provides information on the device manufacturer, CellularRAM generation, and the specific device
configuration. The DIDR is read-only.
8.4.1 Access Using CRE
The registers can be accessed using either a synchronous or an asynchronous operation when the control register
enable (CRE) input is HIGH. When CRE is LOW, a READ or WRITE operation will access the memory array. The
configuration register values are written via addresses A[max:16] and ADQ[15:0]. In an asynchronous WRITE, the
values are latched into the configuration register on the rising edge of ADV#CE#, or WE#, whichever occurs first; LB#
and UB# are ―Don’t Care.‖ The BCR is accessed when A[19:18] are 10b; the RCR is accessed when A[19:18] are 00b.
The DIDR is read when A[19:18] are 01b. For reads, address inputs other than A[19:18] are ―Don’t Care,‖ and register
bits 15:0 are output on DQ[15:0]. Immediately after performing a configuration register READ or WRITE operation,
reading the memory array is highly recommended.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.1.1 Configuration Register WRITE Asynchronous Mode Followed by READ Operation
A[max:16]
(except A[19:18])
A[19:18]
1
CRE
Address
OPCODE
tAVH
tAVS
Select controlr register
Address
tAVS
tAVH
ADV#
CE#
tVP
tCPH
Initiate control register access
tCW
OE#
tWP
Write address bus value
to control register
WE#
LB#/UB#
A/DQ[15:0]
OPCODE
Address
Valid
data
Don’t Care
Notes: 1. A[19:18] = 00b to load RCR, and 10b to load BCR.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.1.2 Configuration Register WRITE Synchronous Mode Followed by READ Operation
CLK
Latch control register value
A [max :16]
(except A[19:18])
Address
OPCODE
tSP
t HD
Latch control register address
Address
A[19:18] 2
t SP
CRE
t SP
tHD
tHD
ADV#
t CBPH
t CSP
CE #
Notes 3
OE#
tSP
WE#
t HD
LB#/UB#
A/DQ [15:0]
OPCODE
Address
Valid
Data
t KHTL
WAIT
High Z
High-z
Don ’t Care
Notes: 1. Non-default BCR settings for synchronous mode configuration register WRITE followed by READ ARRAY operation:
latency code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
2. A[19:18] = 00b to load RCR, and 10b to load BCR.
3. CE# must remain LOW to complete a burst-of-one WRITE. WAIT must be monitored—additional WAIT cycles caused by
refresh collisions require a corresponding number of additional CE# LOW cycles.
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Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.1.3 Register READ Asynchronous Mode Followed by READ ARRAY Operation
A [max:16]
(except A [ 19 :18])
Address
t AVS
Select register
A[19:18]1
tAVH
Address
t AA
t AVH
t AVS
CRE
tAA
ADV#
t VP
CE#
tCPH
t CPH
tAADV
Initiate register access
t HZ
t CO
OE#
t OE
WE#
t BA
t OHZ
tBHZ
t OLZ
LB#/UB#
A/DQ [ 15 : 0 ]
Valid CR
Address
Don t’ Care
Valid
data
Undefined
Note : A[19:18] = 00b to read RCR, 10b to read BCR , and 01b to read DIDR.
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Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.1.4 Register READ Synchronous Mode Followed by READ ARRAY Operation
CLK
Latch control register value
A[max:16 ]
(except A) [19 :18 ]
Address
tSP
Latch control register address
A[19 :18 ]2
Address
tHD
tSP
CRE
tHD
tSP
ADV#
tHD
t ABA
t CBPH
tCSP
CE#
Note 3
tHZ
OE #
t OHZ
WE #
tSP
tHD
tBOE
LB #/UB #
tOLZ
t KOH
Address
Valid CR
A/DQ[15:0]
WAIT
t ACLK
High-Z
t KHTL
Valid
data
High- Z
Don’
t Care
Undefined
Notes :1.Non-default BCR settings for synchronous mode register READ followed by READ ARRAY operation : Latency code2(3
clocks) : WAIT active LOW;WAIT asserted during delay.
2. A[19:18]=00b to read RCR,10b to read BCR, and 01b to read DIDR.
3.CE# must remain LOW to complete a burst-of-one READ. WAIT must be monitored—additional WAIT cycles caused by
refresh collisions require a corresponding number of additional CE# LOW cycles.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.2 Software Access
Software access of the registers uses a sequence of asynchronous READ and asynchronous WRITE operations. The
contents of the configuration registers can be modified and all registers can be read using the software sequence. The
configuration registers are loaded using a four-step sequence consisting of two asynchronous READ operations
followed by two asynchronous WRITE operations.
The read sequence is virtually identical except that an asynchronous READ is performed during the fourth operation.
The address used during all READ and WRITE operations is the highest address of the ADMUX PSRAM device being
accessed; the contents of this address are not changed by using this sequence.
The data value presented during the third operation (WRITE) in the sequence defines whether the BCR, RCR, is to be
accessed. If the data is 0000h, the sequence will access the RCR; if the data is 0001h, the sequence will access the
BCR. During the fourth operation, ADQ[15:0] transfer data in to or out of bits 15:0 of the registers.
The use of the software sequence does not affect the ability to perform the standard (CRE-controlled) method of
loading the configuration registers. However, the software nature of this access mechanism eliminates the need for
CRE. If the software mechanism is used, CRE can simply be tied to VSS. The port line often used for CRE control
purposes is no longer required.
8.4.2.1 Load Configuration Register
CE#
READ
READ
WRITE
WRITE
OE #
WE #
LB #/UB #
ADV#
A [max:16 ]
Address
(MAX)
Address
(MAX)
Address
(MAX)
Address
(MAX)
0ns (min)
A/DQ[15:0 ]
Address
(MAX)
XXXX
Address
(MAX)
XXXX
Address
(MAX)
Address
(MAX)
RCR:0000h
BCR:0001h
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CR value
in
Don’t Care
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.2.2 Read Configuration Register
CE#
READ
READ
WRITE
READ
OE #
WE #
LB #/UB #
ADV#
A[max:16 ]
Address
(MAX)
Address
(MAX)
Address
(MAX)
Address
(MAX)
0ns (min)
A/DQ[15:0 ]
Address
(MAX)
XXXX
Address
(MAX)
XXXX
Address
(MAX)
Address
(MAX)
RCR:0000h
BCR:0001h
DIDR:0002h
CR value
out
Don’t Care
8.4.3 Bus Configuration Register
The BCR defines how the ADMUX PSRAM device interacts with the system memory bus. At power-up, the BCR is
set to 9D1Fh. The BCR is accessed with CRE HIGH and A[19:18] = 10b, or through the register access software
sequence with A/DQ = 0001h on the third cycle.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.1 Bus Configuration Register Definition
A[max:20] A[19:18]
max- 20
19- 18
Register
Select
Reserved
All must be set to " 0"
A[17:16]
17- 16
Reserved
A/DQ15 A/DQ14 A/DQ[ 13:11] A/DQ10
15
Operating
Mode
14- 11
Initial
Latency
Latency
Counter
Must be set to "0"
Variable
9
Reserved
0
1
0
code 2
0
0
1
1
code 3 ( default)
1
0
A/DQ7
8
WAIT
0
0
All others
A/DQ6
7
6
Reserved
Configuration ( WC )
A/DQ5 A/DQ4
5
Reserved
Must be set to "0"
4
Drive Strength
A/DQ3
3
2-0
Burst
Burst
Wrap(BW)* Length ( BL)*
Must be set to "0"
BCR[3]
Burst Wrap ( Note 1)
code 4
0
Burst wraps within the burst length
Reserved
1
Burst no wraps ( default)
1
0
1
0
code 2
1
0
1
1
code 3
1
1
0
0
code 4
BCR[5]
BCR[4]
Drive Strength
0
Full
1/ 2 ( default )
1
1
0
1
code 5
0
1
1
1
0
code 6
0
1
1
0
0
0
code 8
1
0
1/ 4
1
1
reserved
1
All others
Reserved
BCR[10]
WAIT Polarity
BCR[8]
WAIT Configuration
0
Active Low
0
Asserted during delay
1
Active HIGH ( Default)
1
Asserted one data cycle before delay ( default)
BCR[15]
Operating Mode
0
Synchronous burst access mode
1
Asynchronous access mode ( Default)
BCR[19]
BCR[18]
Register Select
0
0
Select RCR
1
0
Select BCR
0
1
Select DIDR
A/DQ[2:0]
Latency
0
0
A/DQ8
Must be set to "0"
BCR[14] BCR[13] BCR[12] BCR[11]
Fixed
10
WAIT
Polarity
A/DQ9
BCR[2] BCR[ 1]
BCR[0]
Burst Length ( Note 1)
0
0
1
0
1
0
8 words
0
1
1
16 words
1
0
0
32 words
1
1
1
Others
4 words
Continuous burst ( default)
Reserved
Notes: 1. Burst wrap and length apply to both READ and WRITE operations.
2. Reserved bits must be set to zero. Reserved bits not set to zero will affect device functionality. BCR[15:0] will be read
back as written.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.2 Burst Length (BCR[2:0]) Default = Continuous Burst
Burst lengths define the number of words the device outputs during burst READ and WRITE operations. The device
supports a burst length of 4, 8, 16, or 32 words. The device can also be set in continuous burst mode where data is
output sequentially without regard to address boundaries; the internal address wraps to 000000h if the device is read
past the last address.
8.4.3.3 Burst Wrap (BCR[3]) Default = No Wrap
The burst-wrap option determines if a 4-, 8-, 16-, or 32-word READ or WRITE burst wraps within the burst length, or
steps through sequential addresses. If the wrap option is not enabled, the device accesses data from sequential
addresses without regard to address boundaries; the internal address wraps to 000000h if the device is read past the
last address.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.4 Sequence and Burst Length
Burst Wrap
BCR[3] Wrap
0
Yes
Start
Addr
Decimal
Length
8-Word
16-Word
32-Word
Burst Length
Burst Length
Burst Length
Linear
Linear
Linear
Linear
Continuous Burst
Linear
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
0-1-2-...-29-30-31
0-1-2-3-4-5-6-…
1
1-2-3-0
1-2-3-4-5-6-7-0
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-0
1-2-3-...-30-31-0
1-2-3-4-5-6-7-…
2
2-3-0-1
2-3-4-5-6-7-0-1
2-3-4-5-6-7-8-9-10-11-12-13-14-15-0-1
2-3-4-...-31-0-1
2-3-4-5-6-7-8-…
3
3-0-1-2
3-4-5-6-7-0-1-2
3-4-5-6-7-8-9-10-11-12-13-14-15-0-1-2
3-4-5-...-0-1-2
3-4-5-6-7-8-9-…
4
4-5-6-7-0-1-2-3
4-5-6-7-8-9-10-11-12-13-14-15-0-1-2-3
4-5-6-...-1-2-3
4-5-6-7-8-9-10-…
5
5-6-7-0-1-2-3-4
5-6-7-8-9-10-11-12-13-14-15-0-1-2-3-4
5-6-7-...-2-3-4
5-6-7-8-9-10-11-…
6
6-7-0-1-2-3-4-5
6-7-8-9-10-11-12-13-14-15-0-1-2-3-4-5
6-7-8-...-3-4-5
6-7-8-9-10-11-12-
7
7-0-1-2-3-4-5-6
7-8-9-10-11-12-13-14-15-0-1-2-3-4-5-6
7-8-9-...-4-5-6
7-8-9-10-11-12-13-…
...
...
...
...
14
14-15-0-1-2-3-4-5-6-7-8-9-10-11-12-13
14-15-16-...-11-12-13
14-15-16-17-18-19-20-...
15
15-0-1-2-3-4-5-6-7-8-9-10-11-12-13-14
15-16-17-...-12-13-14
15-16-17-18-19-20-21-...
...
...
...
30
30-31-0-...-27-28-29
30-31-32-33-34-...
31
31-0-1-...-28-29-30
31-32-33-34-35-...
0
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
0-1-2...--29-30-31
0-1-2-3-4-5-6-…
1
1-2-3-4
1-2-3-4-5-6-7-8
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16
1-2-3-...-30-31-32
1-2-3-4-5-6-7-…
2
2-3-4-5
2-3-4-5-6-7-8-9
2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17
2-3-4-...-31-32-33
2-3-4-5-6-7-8-…
3
3-4-5-6
3-4-5-6-7-8-9-10 3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18
3-4-5-...-32-33-34
3-4-5-6-7-8-9-…
4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19
4-5-6-...-33-34-35
4-5-6-7-8-9-10-…
5-6-7-8-9-10-11-12-13-...-15-16-17-18-19-20
5-6-7-...-34-35-36
5-6-7-8-9-10-11…
5
No
Burst
0
4
1
4-Word
6
4-5-6-7-8-9-1011
5-6-7-8-9-10-1112
6-7-8-9-10-11-
6-7-8-9-10-11-12-13-14-...-16-17-18-19-20-21 6-7-8-...-35-36-37
6-7-8-9-10-11-12…
7-8-9-10-11-12-13-14-...-17-18-19-20-21-22
7-8-9-...-36-37-38
7-8-9-10-11-12-13…
...
...
...
...
14
14-15-16-17-18-19-...-23-24-25-26-27-28-29
14-15-16-...-43-44-45
14-15-16-17-18-19-20-…
15
15-16-17-18-19-20-...-24-25-26-27-28-29-30
15-16-17-...-44-45-46
15-16-17-18-19-20-21-…
...
...
...
30
30-31-32-...-59-60-61
30-31-32-33-34-35-36-...
31
31-32-33-...-60-61-62
31-32-33-34-35-36-37-...
7
12-13
7-8-9-10-11-1213-14
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.5 Drive Strength (BCR[5:4]) Default = Outputs Use Half-Drive Strength
The output driver strength can be altered to full, one-half, or one-quarter strength to adjust for different data bus
loading scenarios. The reduced-strength options are intended for stacked chip (Flash + ADMUX PSRAM )
environments when there is a dedicated memory bus. The reduced-drive-strength option minimizes the noise
generated on the data bus during READ operations. Full output drive strength should be selected when using a
discrete ADMUX PSRAM device in a more heavily loaded data bus environment. Outputs are configured at half-drive
strength during testing.
8.4.3.6 Table of Drive Strength
BCR[5]
BCR[4]
Drive Strength
Impedance Typ (Ω)
Use Recommendation
0
0
Full
25–30
CL = 30pF to 50pF
0
1
1/2 (default)
50
CL = 15pF to 30pF
1
0
1/4
100
CL = 15pF or lower
1
1
Reserved
8.4.3.7 WAIT Configuration. (BCR[8])
Default =WAIT Transitions 1 Clock Before Data Valid/ Invalid
The WAIT configuration bit is used to determine when WAIT transitions between the asserted and the de-asserted
state with respect to valid data presented on the data bus. The memory controller will use the WAIT signal to
coordinate data transfer during synchronous READ and WRITE operations. When BCR[8] = 0, data will be valid or
invalid on the clock edge immediately after WAIT transitions to the de-asserted or asserted state, respectively. When
BCR[8] = 1, the WAIT signal transitions one clock period prior to the data bus going valid or invalid.
8.4.3.8 WAIT Polarity (BCR[10])
Default = WAIT Active HIGH
The WAIT polarity bit indicates whether an asserted WAIT output should be HIGH or LOW. This bit will determine
whether the WAIT signal requires a pull-up or pull-down resistor to maintain the de-asserted state.
The default value is BCR[10]=1, indicating WAIT active HIGH.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.9 WAIT Configuration During Burst Operation
CLK
BCR[8]=0
Data vaild in current cycle
WAIT
BCR[8]=1
Data vaild in next cycle
WAIT
A/DQ[15:0]
Initial latency
D0
D1
D2
D3
End of row
Don’
t care
Note : Signals shown are for WAIT active LOW, no wrap.
8.4.3.10 Latency Counter (BCR[13:11]) Default = Three Clock Latency
The latency counter bits determine how many clocks occur between the beginning of a READ or WRITE operation and
the first data value transferred. For allowable latency codes, see the following tables and figures.
8.4.3.11 Initial Access Latency (BRC[14]) Default = Variable
Variable initial access latency outputs data after the number of clocks set by the latency counter. However, WAIT must
be monitored to detect delays caused by collisions with refresh operations.
Fixed initial access latency outputs the first data at a consistent time that allows for worst-case refresh collisions. The
latency counter must be configured to match the initial latency and the clock frequency. It is not necessary to monitor
WAIT with fixed initial latency. The burst begins after the number of clock cycles configured by the latency counter.
8.4.3.12 Allowed Latency Counter Settings in Variable Latency Mode
BCR[13:11]
Latency
Configuration
Code
Latency *1
Max Input CLK Frequency (MHz)
Normal
Maximum
with Refresh
Collision
133
108
010
2 (3 clocks)
2
4
66 (15ns)
66 (15ns)
011
3(4clocks)—default
3
6
108 (9.25ns)
108 (9.25ns)
100
4 (5 clocks)
4
8
133 (7.5ns)
—
Others
Reserved
—
—
—
—
Notes: 1. Latency is the number of clock cycles from the initiation of a burst operation until data appears. Data is transferred on the
next clock cycle.
- 27 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.13 Latency Counter (Variable Initial Latency, No Refresh Collision)
CLK
A[max :16]
Valid
address
ADV#
Code2
Valid
address
A/DQ [15 :0]
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
Code3 (Default)
Valid
address
A/DQ [15 :0]
A/DQ [15 :0]
Code4
Valid
address
Don’
t Care
Undefined
8.4.3.14 Allowed Latency Counter Settings in Fixed Latency Mode
Max Input CLK Frequency (MHz)
BCR[13:11]
Latency Configuration Code
Latency
Count (N)
010
2 (3 clocks)
2
33 (30ns)
33 (30ns)
011
3 (4 clocks)—default
3
52 (19.2ns)
52 (19.2ns)
100
4 (5 clocks)
4
66 (15ns)
66 (15ns)
101
110
000
Others
5 (6 clocks)
6 (7 clocks)
8 (9 clocks)
Reserved
5
6
8
—
75 (13.3ns)
108 (9.25ns)
133 (7.5ns)
—
75 (13.3ns)
108 (9.25ns)
—
—
- 28 -
133
108
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.3.15 Latency Counter (Fixed Latency)
N-1
Cycles
Cycle N
CLK
t AA
A [max :16]
Valid
address
t AADV
ADV #
t CO
CE #
t ACLK
A/DQ[15:0 ]
( READ )
Valid
output
Valid
output
Valid
output
Valid
output
Valid
output
tSP tHD
A/DQ[15:0 ]
( WRITE )
Valid
address
Valid
input
Burst Identified
(ADV # = LOW)
Valid
input
Valid
input
Don t’ Care
Valid
input
Valid
input
Undefined
8.4.3.16 Operating Mode (BCR[15])
Default = Asynchronous Operation
The operating mode bit selects either synchronous burst operation or the default asynchronous mode of operation.
8.4.4 Refresh Configuration Register
The refresh configuration register (RCR) defines how the ADMUX PSRAM device performs its transparent self refresh.
Altering the refresh parameters can dramatically reduce current consumption during standby mode. At power-up, the
RCR is set to 0010h. The RCR is accessed with CRE HIGH and A[19:18] = 00b; or through the register access
software sequence with A/DQ = 0000h on the third cycle.
- 29 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.4.1 Refresh Configuration Register Mapping
A [max :20] A[19:18]
max-20 19 - 18
Reserved
Register
Select
A [17:16], ADQ [15: 7] ADQ 6 ADQ5
17 - 7
6
5
Ignored
Reserved
ADQ 4
4
ADQ 2
ADQ1
ADQ0
3
2
1
0
Reserved
DPD
All must be set to“ 0 ” All must be set to“ 0 ” Setting is ignored
ADQ 3
PAR
Must be set to“ 0 ”
RCR[19] RCR[18]Register Select
RCR[2] RCR[1] RCR[0] Refersh Coverage
0
0
Selsect RCR
0
0
0
Full array(default)
1
0
Selsect BCR
0
0
1
Bottom 1/2 array
0
1
Selsect DIDR
0
1
0
Bottom1/4 array
0
1
1
Bottom1/ 8 array
1
0
0
None of array
1
0
1
Top 1/2 array
1
1
0
Top 1/4 array
1
1
1
Top 1/8 array
RCR [4]
Deep Power - Down
0
DPD Enable
1
DPD Disable (default)
Notes : Reserved bits must be set to zero. Reserved bits not set to zero will affect device functionality. RCR[15:0] will be read back
as written.
8.4.4.2 Partial Array Refresh (RCR[2:0]) Default = Full Array Refresh
The PAR bits restrict refresh operation to a portion of the total memory array. This feature allows the device to reduce
standby current by refreshing only that part of the memory array required by the host system. The refresh options are
full array, one-half array, one-quarter array, one-eighth array, or none of the array. The mapping of these partitions can
start at either the beginning or the end of the address map.
- 30 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
8.4.4.3 Address Patterns for PAR (RCR [4] = 1)
RCR[2] RCR[1] RCR[0] Active Section
Address Space
Size
Density
0
0
0
Full die
000000h–3FFFFFh
4 Meg x 16
64Mb
0
0
1
One-half of die
000000h–1FFFFFh
2 Meg x 16
32Mb
0
1
0
One-quarter of die
000000h–0FFFFFh
1 Meg x 16
16Mb
0
1
1
One-eighth of die
000000h–07FFFFh
0.5 Meg x 16
8Mb
1
0
0
None of die
0
0 Meg x 16
0Mb
1
0
1
One-half of die
200000h–3FFFFFh
2 Meg x 16
32Mb
1
1
0
One-quarter of die
300000h–3FFFFFh
1 Meg x 16
16Mb
1
1
1
One-eighth of die
380000h–3FFFFFh
0.5 Meg x 16
8Mb
8.4.4.4 Deep Power-Down (RCR[4]) Default = DPD Disabled
The deep power-down bit enables and disables all refresh-related activity. This mode is used if the system does not
require the storage provided by the ADMUX PSRAM device. Any stored data will become corrupted when DPD is
enabled. When refresh activity has been re-enabled, the CellularRAM device will require 150μs to perform an
initialization procedure before normal operations can resume.
Deep power-down is enabled by setting RCR[4] = 0 and taking CE# HIGH. DPD can be enabled using CRE or the
software sequence to access the RCR. Taking CE# LOW for at least 10μs disables DPD and sets RCR[4] = 1; it is not
necessary to write to the RCR to disable DPD. BCR and RCR values (other than BCR[4]) are preserved during
DPD.
8.4.5 Device Identification Register
The DIDR provides information on the device manufacturer, CellularRAM generation, and the specific device
configuration. This register is read-only.
The DIDR is accessed with CRE HIGH and A[19:18] = 01b, or through the register access software sequence with
ADQ = 0002h on the third cycle.
8.4.5.1 Device Identification Register Mapping
Bit Field
DIDR[15]
DIDR[14:11]
DIDR[10:8]
DIDR[7:5]
DIDR[4:0]
Field name
Row length
Device version
Device density
CellularRAM generation
Vendor ID
Length
Bit Setting
Version
Bit Setting
Density
Bit Setting
Generation
Bit Setting
256
1b
3rd
0010b
64Mb
010b
CR1.5
010b
Vendor Bit Setting
Options
- 31 -
Winbond
00110b
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
9. ELECTRICAL CHARACTERISTIC
9.1 Absolute Maximum DC, AC Ratings
Parameter
Min
Max
Unit
Operating temperature (case) Wireless
-40
+85
ºC
Storage temperature (plastic)
-55
+150
ºC
Soldering temperature and time 10s (solder ball only)
+260
ºC
Voltage to any ball except VCC, VCCQ relative to VSS
-0.3
VCCQ +0.3
V
Voltage on VCC supply relative to VSS
-0.20
+2.45
V
Voltage on VCCQ supply relative to VSS
-0.20
+2.45
V
Stresses greater than those listed may cause permanent damage to the device. This is a stress rating only, and
functional operation of the device at these or any other conditions above those indicated in the operational sections of
this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
reliability.
9.2 Electrical Characteristics and Operating Conditions
Description
Conditions
Min
Max
Unit
VCC
1.7
1.95
V
I/O supply voltage
VCCQ
1.7
1.95
V
Input high voltage
VIH
VCCQ–0.4
VCCQ+0.2
V
1
Input low voltage
VIL
–0.20
0.4
V
2
0.8xVCCQ
V
3
3
Supply voltage
Symbol
Typical
Note
Output high voltage
IOH=–0.2mA
VOH
Output low voltage
IOL=+0.2mA
VOL
0.2xVCCQ
V
Input leakage current
VIN=0 toVCCQ
ILI
1
μA
Output leakage current
OE#=VIH or chip disabled
ILO
1
μA
mA
4
mA
4
mA
4
mA
4
Operating Current
Asynchronous random
ICC1
READ/WRITE
Initial access,
burst READ/WRITE
tRC/tWC=70ns
-
25
133MHz
-
40
108MHz
-
35
133MHz
-
35
108MHz
-
30
133MHz
-
40
108MHz
-
35
ICC2
VIN = VCCQ or 0V chip enabled,
IOUT=0
Continuous burst READ
ICC3R
Continuous burst WRITE
ICC3W
Standby Current
VIN = VCCQ or 0V, CE# = VCCQ
ISB
Standard
250
uA
5,6
Notes: 1. Input signals may overshoot to VCCQ + 1.0V for periods less than 2ns during transitions.
2. Input signals may undershoot to VSS – 1.0V for periods less than 2ns during transitions.
3. BCR[5:4] = 01b (default setting of one-half drive strength).
4.This parameter is specified with the outputs disabled to avoid external loading effects. The user must add the current
required to drive output capacitance expected in the actual system.
5.ISB (max) values measured with PAR set to FULL ARRAY and at +85°C. In order to achieve low standby current, all inputs
must be driven to either VCCQ or VSS. ISB might be slightly higher for up to 500ms after power-up, or when entering
standby mode.
6.ISB (typ) is the average ISB at 25°C and VCC = VCCQ = 1.8V. This parameter is verified during characterization, and is
not 100% tested.
- 32 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
9.3 Deep Power-Down Specifications
DESCRIPTION
CONDITIONS
SYMBOL
TYPICAL
UNIT
Deep PowerDown
VIN = VCCQ or 0V;
VCC, VCCQ = 1.95V; +85°C
IZZ
10
μA
Max
Unit
Note: Typical (TYP) IZZ value applies across all operating temperatures and voltages.
9.4 Partial Array Self Refresh Standby Current
Conditions
Description
Partial-array
refresh standby
current
VIN = VCCQ or 0V,
CE# = VCCQ
Array
Partition
Symbol
IPAR
Standard
power (no
designation)
Full
250
1/2
TBD
1/4
TBD
1/8
TBD
0
TBD
uA
9.5 Capacitance
Description
Conditions
Input Capacitance
Input/Output
Capacitance (A/DQ)
TC = +25ºC; f = 1 MHz;
VIN = 0V
Symbol
Min
Max
Unit
Note
CIN
2.0
6
pF
1
CIO
3.0
6.5
pF
1
Notes: 1. These parameters are verified in device characterization and are not 100% tested.
9.6 AC Input-Output Reference Wave form
VccQ
Intput1
VccQ/22
VccQ/23
Test Points
Output
VssQ
Notes:1.AC test inputs are driven at VCCQ for a logic 1 and VSSQ for a logic 0. Input rise and fall times (10% to 90%) <1.6ns.
2.Input timing begins at VCCQ/2.
3.Output timing ends at VCCQ/2.
9.7 AC Output Load Circuit
Test Point
50 Ohm
DUT
VCCQ/2
30pF
Notes: All tests are performed with the outputs configured for default setting of half drive strength (BCR[5:4] = 01b).
- 33 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10. TIMING REQUIRMENTS
10.1 Read, Write Timing Requirements
10.1.1 Asynchronous READ Cycle Timing Requirements
All tests performed with outputs configured for default setting of half drive strength, (BCR[5:4] = 01b).
Parameter
Address access time
ADV# access time
Symbol
Min
Max
Unit
tAA
70
ns
tAADV
70
ns
Address hold from ADV# HIGH
tAVH
2
ns
Address setup to ADV# HIGH
tAVS
5
ns
LB#/UB# access time
tBA
70
ns
LB#/UB# disable to DQ High-Z Output
tBHZ
7
ns
Chip select access time
tCO
70
ns
CE# LOW to ADV# HIGH
tCVS
7
Note
1
ns
Chip disable to DQ and WAIT High-Z output
tHZ
7
ns
Output enable to valid output
tOE
20
ns
7.5
ns
7
ns
1
2
OE# LOW to WAIT valid
tOEW
Output disable to DQ High-Z output
tOHZ
Output enable to Low-Z output
tOLZ
3
ns
tVP
5
ns
ADV# pulse width
1
1
Notes: 1. Low-Z to High-Z timings are tested with AC Output Load Circuit. The High-Z timings measure a 100mV transition from
either VOH or VOL toward VCCQ/2.
2. High-Z to Low-Z timings are tested with the circuit. The Low-Z timings measure a 100mV transition away from the High-Z
(VCCQ/2) level toward either VOH or VOL.
- 34 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.1.2 Burst READ Cycle Timing Requirements
All tests performed with outputs configured for default setting of half drive strength, (BCR[5:4] = 01b).
133MHz
Parameter
108MHz
Symbol
Unit
Note
Min Max Min Max
Address access time (fixed latency)
tAA
70
70
ns
tAADV
70
70
ns
tABA
35.5
35.9
ns
CLK to output delay
tACLK
5.5
7
ns
Address hold from ADV# HIGH (fixed latency)
tAVH
Burst OE# LOW to output delay
tBOE
ADV# access time (fixed latency)
Burst to READ access time (variable latency)
2
2
20
5
ns
20
5
ns
CE# HIGH between subsequent burst or mixed-mode operations
tCBPH
Maximum CE# pulse width
tCEM
CLK period
tCLK
Chip select access time (fixed latency)
tCO
CE# setup time to active CLK edge
tCSP
2.5
3
ns
Hold time from active CLK edge
tHD
1.5
2
ns
Chip disable to DQ and WAIT High-Z output
tHZ
7
7
ns
CLK rise or fall time
tKHKL
1.2
1.6
ns
CLK to WAIT valid
tKHTL
5.5
7
ns
Output HOLD from CLK
tKOH
2
2
ns
CLK HIGH or LOW time
tKP
3
3
ns
4
7.5
4
9.25
70
Output disable to DQ High-Z output
tOHZ
Output enable to Low-Z output
tOLZ
3
Setup time to active CLK edge
tSP
2
1
µs
1
ns
70
7
ns
7
ns
2
ns
2
3
ns
3
3
ns
Notes: 1. A refresh opportunity must be provided every tCEM. A refresh opportunity is satisfied by either of the following two
conditions: a) clocked CE# HIGH, or b) CE# HIGH for longer than 15ns.
2. Low-Z to High-Z timings are tested with the circuit. The High-Z timings measure a 100mV transition from either VOH or
VOL toward VCCQ/2.
3. High-Z to Low-Z timings are tested with the circuit. The Low-Z timings measure a 100mV transition away from the High-Z
(VCCQ/2) level toward either VOH or VOL.
- 35 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.1.3 Asynchronous WRITE Cycle Timing Requirements
Parameter
Symbol
Min
tAS
0
ns
Address HOLD from ADV# going HIGH
tAVH
2
ns
Address setup to ADV# going HIGH
tAVS
5
ns
Address valid to end of WRITE
tAW
70
ns
LB#/UB# select to end of WRITE
tBW
70
ns
CE# HIGH between subsequent asynchronous operations
tCPH
5
ns
CE# LOW to ADV# HIGH
tCVS
7
ns
Chip enable to end of WRITE
tCW
70
ns
Data HOLD from WRITE time
tDH
0
ns
Data WRITE setup time
tDW
20
ns
Chip disable to WAIT High-Z output
tHZ
ADV# pulse width
tVP
5
ns
ADV# setup to end of WRITE
tVS
70
ns
WRITE to DQ High-Z output
tWHZ
Address and ADV# LOW setup time
Max
7
7
Unit
ns
Note
1
ns
1
2
WRITE pulse width
tWP
45
ns
WRITE recovery time
tWR
0
ns
Notes: 1. Low-Z to High-Z timings are tested with AC Output Load Circuit. The High-Z timings measure a 100mV transition from
either VOH or VOL toward VCCQ/2.
2. WE# LOW time must be limited to tCEM (4μs).
- 36 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.1.4 Burst WRITE Cycle Timing Requirements
133MHz
Parameter
Min
Address and ADV# LOW setup time
108MHz
Symbol
Max
Min
Unit
Note
1
Max
tAS
0
0
ns
tAVH
2
2
ns
CE# HIGH between subsequent burst or mixed-mode
operations
tCBPH
5
5
ns
2
Maximum CE# pulse width
tCEM
µs
2
Clock period
tCLK
7.5
9.25
ns
CE# setup to CLK active edge
tCSP
2.5
3
ns
Hold time from active CLK edge
tHD
1.5
2
ns
Chip disable to WAIT High-Z output
tHZ
7
7
ns
CLK rise or fall time
tKHKL
1.2
1.6
ns
Clock to WAIT valid
tKHTL
5.5
7
ns
Output HOLD from CLK
tKOH
2
2
ns
CLK HIGH or LOW time
tKP
3
3
ns
Setup time to activate CLK edge
tSP
2
3
ns
Address HOLD from ADV# HIGH (fixed latency)
4
4
3
Notes: 1. tAS required if tCSP > 20ns.
2. A refresh opportunity must be provided every tCEM. A refresh opportunity is satisfied by either of the following two
conditions: a) clocked CE# HIGH, or b) CE# HIGH for longer than 15ns.
3. Low-Z to High-Z timings are tested with the circuit. The High-Z timings measure a 100mV transition from either VOH or
VOL toward VCCQ/2.
- 37 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2 TIMING DIAGRAMS
10.2.1 Initialization Period
VCC (MIN)
VCC, VCCQ = 1.7V
Device ready for normal operation
tPU
10.2.2 DPD Entry and Exit Timing Parameters
tDPD
tDPDX
tPU
DPD Enabled
DPD Exit
Device
Initialization
CE#
Write
RCR [4] = 0
Device ready for
Normal operation
10.2.3 Initialization and DPD Timing Parameters
DESCRIPTION
SYMBOL
CE# HIGH after Write BCR[4]=0
CE# LOW between DPD Enable and Device Initialization
DPD Exit to next Operation Command
- 38 -
Min
Max
UNIT
tDPD
150
-
μs
tDPDX
10
-
μs
tPU
-
150
μs
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.4 Asynchronous READ
A[max:16]
ADV#
CE#
VIH
VIL
VIH
VIL
VIH
VIL
Valid
address
tAA
tAVH
tAVS
tAADV
tVP
tCVS
tHZ
tCO
tBA
LB#/UB#
VIH
VIL
OE#
VIH
VIL
WE#
VIH
VIL
VIH
A/DQ[15:0]
VIL
VOH
WAIT
VOL
tBHZ
tOHZ
tOE
tOLZ
tAVS
t
AVH
Valid
address
AA
t
VOH
VOL
tOEW
Valid
output
High-z
tHZ
High-z
High-z
Don't Care
- 39 -
Undefined
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.5 Single Access Burst READ Operation - Variable Latency
t CLK
VIH
CLK
VIL
t SP
VIH
A[max:16]
VIL
t KP
t KHKL
Valid address
t SP
ADV#
t HD
t KP
tHD
VIH
VIL
t HD
tCEM
t CSP
t ABA
t HZ
VIH
CE# VIL
t BOE
OE#
tOHZ
VIH
V IL
tSP
WE #
t OLZ
t HD
VIH
VIL
t SP
LB #/ UB#
VIH
VIL
VIH
A/DQ [15:0 ]
VIL
WAIT
VOH
VOL
t HD
tSP
t HD
Valid address
t KOH
t ACLK
VOH HIGH Z
VOL
Valid output
tKOH
HIGH -Z
HIGH -Z
t KHTL
t KHTL
Don' t Care
READ burst identified
( WE # = HIGH)
Undefined
Note: Non-default BCR settings: latency code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
- 40 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.6 Four Word Burst READ Operation-Variable Latency
t KHKL
CLK
t KP
tCLK
t KP
VIH
VIL
VIH
A[max:16]
VIL
tSP
tHD
Valid address
t SP
tHD
VIH
ADV #
VIL
VIH
CE #
t CEM
tCSP
t ABA
tCBPH
t HD
tHZ
VIL
t BOE
OE #
VIH
VIL
tSP
tHD
tOHZ
tOLZ
VIH
WE #
VIL
t SP
VIH
LB#/UB#
VIL
VIH
A/DQ [15:0]
VIL
WAIT
VOH
VOL
t SP
tHD
tHD
Valid address
t ACLK
VOH
VOL
Valid output
t KOH
Valid output
Valid output
Valid output
t KOH
Note 2
HIGH-Z
HIGH - Z
t KHTL
Note 3
HIGH-Z
tKHTL
Don ' t Care
READ Burst Identified
( WE # = HIGH)
Undefined
Notes: 1. Non-default BCR settings: latency code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
2. WAIT will remain de-asserted even if CE# remains LOW past the end of the defined burst length.
3. A/DQ[15:0] will output undefined data if CE# remains LOW past the end of the defined burst length.
- 41 -
Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.7 Single-Access Burst READ Operation-Fixed Latency
tCLK
t KP
tKP
VIH
CLK
VIL
t KHKL
t SP
VIH
A [ max:16]
VIL
Valid Address
t SP
VIH
t AVH
tHD
t AA
ADV #
t AADV
tCEM
VIL
tHD
tCSP
VIH
tHZ
CE #
VIL
tCO
t BOE
VIH
t OHZ
OE #
VIL
tSP
t HD
tOLZ
VIH
WE #
VIL
t HD
t SP
VIH
LB # / UB #
VIL
A/DQ [15:0]
WAIT
VIH
VIL
VOH
VOL
t SP
t AVH
t ACLK
VOH
VOL
Valid address
t KOH
Valid
output
High - Z
tKOH
High -Z
High - Z
t KHTL
t KHTL
READ Burst Identified
( WE # = HIGH )
Don't Care
Undefined
Note: Non-default BCR settings: fixed latency, latency code 4 (5 clocks), WAIT active LOW, WAIT asserted during delay.
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W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.8 Four Word Burst READ Operation-Fixed Latency
CLK
t KHKL
VIH
t KP
t KP
tCLK
VIL
t SP
VIH
A [max:16]
VIL
ADV #
VIH
Valid Address
t AVH
tSP
t AA
t HD
VIL
t AADV
tCEM
VIH
CE # VIL
t HZ
t CO
VIH
OE # VIL
WE #
VIH
A/DQ[15:0]
VIL
WAIT
t BOE
tSP tHD
t OLZ
t OHZ
VIH
VIL
VIH
LB#/UB# VIL
VOH
VOL
tCBPH
tHD
tCSP
t HD
t SP
t AVH
tSP
Valid
address
VOH
VOL
t ACLK
Valid
output
t KOH
t KOH
Valid
output
Valid
output
Valid
output
High - Z
t KHTL
Note 3
HIGH-Z
Note 2
High-Z
t KHTL
READ Burst Identified
(WE# = HIGH)
Don ’ t care
Undefined
Notes: 1. Non-default BCR settings: fixed latency, latency code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
2. WAIT will remain de-asserted even if CE# remains LOW past the end of the defined burst length.
3. A/DQ[15:0] will output undefined data if CE# remains LOW past the end of the defined burst length.
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W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.9 Burst READ Terminate at End-of-Row (Wrap Off)
CLK
VIH
VIL
t CLK
VIH
A[max :16]
VIL
ADV#
VIH
VIL
VIH
LB#/UB#
VIL
t HD
CE#
OE #
WE #
t CSP
Note2
VIH
VIL
VIH
VIL
VIH
VIL
End of Row
VOH
A/DQ[15:0]
VOL
VOH
WAIT
VOL
Valid
output
Valid
output
t KHTL
t HZ
t HZ
High-Z
t KOH
Don ' t Care
Undefined
Notes: 1. Non-default BCR settings for burst READ at end of row: fixed or variable latency, WAIT active LOW, WAIT asserted
during delay (shown as solid line).
2. For burst READs, CE# must go HIGH before the second CLK after the WAIT period begins (before the second CLK after
WAIT asserts with BCR[8] = 0, or before the third CLK after WAIT asserts with BCR[8] = 1).
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.10 Burst READ Row Boundary Crossing
CLK
VIH
VIL
t CLK
VIH
A[max:16]
VIL
VIH
ADV# VIL
LB#/UB#
VIH
VIL
CE #
VIH
VIL
OE #
WE #
VIH
VIL
VIH
VIL
VOH
A/DQ [15:0]
VOL
WAIT
VOH
VOL
Valid
output
Valid
output
Valid
output
t KHTL
Valid
output
t KHTL
End of Row
Note 2
t KOH
t KOH
Undefined
Don't Care
Notes: 1. Non-default BCR settings for burst READ at end of row: fixed or variable latency, WAIT active LOW, WAIT asserted
during delay (shown as solid line).
2. WAIT will be asserted for LC cycles for variable latency, or LC cycles for fixed latency.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.11 Asynchronous WRITE
VIH
A[ max :16]
Valid address
VIL
t AVS
VIH
ADV #
VIL
t AVH
t AW
t VS
t VP
t AS
t AS
tCVS
VIH
tCW
CE #
VIL
t BW
VIH
LB # /UB #
VIL
VIH
OE #
t WP
VIL
VIH
WE #
VIL
t AS
t AVS
t AVH
VIH
A/DQ[15:0]
VIL
t DW
t DH
Valid Input
Valid address
t AW
WAIT
VOH
High - Z
VOL
Don' t Care
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.12 Burst WRITE Operation—Variable Latency Mode
tCLK
t KP
t KHKL
t KP
VIH
CLK
VIL
tSP
tHD
VIH
Valid address
A[max:16]
VIL
t AS
3
tSP
VIH
t HD
ADV#
VIL
t AS3
t SP tHD
VIH
LB#/UB#
VIL
t CEM
t HD
t CSP
VIH
tCBPH
CE#
Note 4
VIL
OE#
WE#
VIH
VIL
t SP
t HD
VIH
VIL
t AS 3
t SP
VIH
A/DQ[15:0 ]
VIL
VIH
VIL
t SP
tHD
Valid
address
D1
VOH
D2
D3
D0
tHZ
tKHTL
t KHTL
WAIT
t HD
High - Z
High - Z
Note 2
t KOH
VOL
WRITE burst identified
(WE # = LOW )
Undefined
Don' t Care
Notes: 1. Non-default BCR settings for burst WRITE operation in variable latency mode: latency code 2 (3 clocks), WAIT active
LOW, WAIT asserted during delay, burst length 4, burst wrap enabled.
2. WAIT asserts for LC cycles for both fixed and variable latency. LC = latency code (BCR[13:11]).
3. tAS is required if tCSP > 20ns.
4. CE# must go HIGH before any clock edge following the last word of a defined-length burst.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.13 Burst WRITE Operation-Fixed Latency Mode
t CLK
t KP
tKP
t KHKL
VIH
CLK
VIL
A[max: 16]
VIH
VIL
t AS3
VIH
ADV#
t SP
Valid
address
t AVH
tSP t HD
3
VIL
t AS
tSP t HD
LB # / UB#
VIH
VIL
t CEM
VIH
CE #
VIL
Note 4
VIH
OE #
VIL
t SP t HD
VIH
WE #
VIL
A/DQ[15:0]
VIH
V IL
t AVH
t AS 3
V
tSP t HD
Valid
address
D1
VOH
VOL
High - Z
D2
D3
D0
tKHTL
t SP t KHTL
WAIT
t HD tCBPH
tCSP
t HZ
High - Z
Note 2
t KOH
WRITE burst identified
( WE # = LOW )
Undefined
Dont ' Care
Notes: 1. Non-default BCR settings for burst WRITE operation in fixed latency mode: fixed latency, latency code 2 (3 clocks), WAIT
active LOW, WAIT asserted during delay, burst length 4, burst wrap enabled.
2. WAIT asserts for LC cycles for both fixed and variable latency. LC = latency code (BCR[13:11]).
3. tAS is required if tCSP > 20ns.
4. CE# must go HIGH before any clock edge following the last word of a defined-length burst.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.14 Burst WRITE Terminate at End of Row (Wrap Off)
CLK
VIH
VIL
tCLK
VIH
A [max:16 ]
VIL
ADV #
VIH
VIL
VIH
LB # /UB #
VIL
WE #
VIH
VIL
OE# VIH
VIL
CE #
tcsp
tHD
VIH
Note 2
VIL
t SP t HD
VIH
A/DQ[15:0 ]
VIL
Valid input Valid input Valid input
END OF ROW
tHZ
WAIT
t HZ
VOH
VOL
High - Z
tKOH
tKHTL
Don' t Care
Undefined
Notes: 1. Non-default BCR settings for burst WRITE at end of row: fixed or variable latency, WAIT active LOW, WAIT asserted
during delay (shown as solid line).
2. For burst WRITEs, CE# must go HIGH before the second CLK after the WAIT period begins (before the second CLK after
WAIT asserts with BCR[8] = 0, or before the third CLK after WAIT asserts with BCR[8] = 1).
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.15 Burst WRITE Row Boundary Crossing
VIH
VIL
CLK
t CLK
A[max:16]
VIH
VIL
ADV #
VIH
VIL
LB# / UB #
VIH
VIL
WE #
OE#
VIH
VIL
VIH
VIL
VIH
CE#
V IL
VIH
A/DQ[15:0]
VIL
WAIT
t SP t HD
Valid input
End of row
Valid input Valid input
Valid input Valid input
t KHTL
VOH
t KHTL
V OL
t KOH
Note 2
t KOH
Don' t Care
Undefined
Notes: 1. Non-default BCR settings for burst WRITE at end of row: fixed or variable latency, WAIT active LOW, WAIT asserted
during delay (shown as solid line).
2. WAIT will be asserted for LC cycles for variable latency, or LC cycles for fixed latency.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.16 Burst WRITE Followed by Burst READ
VIH
CLK VIL
A[max:16] VIH
VIL
VIH
ADV# VIL
tCLK
tSP tHD
tSP tHD
Valid
Valid
Valid
Address
Address
Address
tSP tHD
tSP
LB#/UB# VIH
VIL
tHD t CBPH
Note 2
OE # VIH
VIL
VIH
WE# VIL
tHD
tCSP
VIH
CE# VIL
tSP
tSP
tHD
A/DQ[15:0] VIH
Valid
Address
IN/OUT VIL
VOH High-Z t HD
WAIT VOL
tHD
tSP
t CSP
tOHZ
tSP tHD
tSP tHD t BOE
t SP tHD
D0 D1 D2 D3
Valid
address
VOH
VOL
tACLK
tKOH
Valid
Output
Valid
Output
Valid
Output
Valid
Output
High- Z
Don' t Care Undefined
Notes: 1. Non-default BCR settings for burst WRITE followed by burst READ: fixed or variable latency, latency code 2 (3 clocks),
WAIT active LOW, WAIT asserted during delay.
2. A refresh opportunity must be provided every tCEM. A refresh opportunity is satisfied by either of the following
two conditions: a) clocked CE# HIGH, or b) CE# HIGH for longer than 15ns.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.17 Asynchronous WRITE Followed by Burst READ
CLK
A[max:16]
tCLK
VIH
VIL
VIH
VIL
ADV#
VIH
VIL
LB #/ UB #
VIH
VIL
CE #
VIH
VIL
t SP
Valid address
t AVS
t AS
t AS
t HD
Valid address
t AVH
t SP tHD
t VP
tBW
t HD
tSP
tCBPH
tCW
tCSP
tOHZ
Note 2
OE #
VIH
VIL
WE #
VIH
VIL
A/DQ[15:0]
VIH
VIL
tWC
t WP
t AS
VOH
VOL
t SP tHD
Valid address
t AVS
WAIT
t SP tHD
tAVH
Data
tDW tDH
VOH
VOL
tKHTL
tBOE
Valid
output
Valid
address
t ACLK
Valid
output
Valid
output
t KOH
Valid
output
High- Z
Don't Care
Undefined
Notes: 1. Non-default BCR settings for asynchronous WRITE, with ADV# LOW, followed by burst READ: fixed or variable latency,
latency code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
2. When the device is transitioning between asynchronous and variable-latency burst operations, CE# must go HIGH. CE#
can stay LOW when the device is transitioning to fixed-latency burst READs. A refresh opportunity must be provided every
tCEM. A refresh opportunity is satisfied by either of the following two conditions: a) clocked CE# HIGH, or b) CE# HIGH for
longer than 15ns.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.18 Burst READ Followed by Asynchronous WRITE
tCLK
CLK
V IH
VIL
V IH
A[max: 16 ]
VIL
V IH
ADV #
VIL
tSP t HD
Vaild address
Valid address
t AVS
tAVH
t AS
tSP t HD
CE #
V IH
VIL
OE #
V IH
VIL
WE #
V IH
VIL
WAIT
VOH
VOL
tVP
t CW
Note 2
t BOE
tSP tHD
tSP
High-Z
t WP
VOH
VOL
t WPH
t BW
tHD
t SP tHD
Valid address
t OHZ
tOLZ
V IH
LB#/ UB#
VIL
V IH
A/DQ [15:0]
VIL
tCBPH
t HZ t AS
tHD
t CSP
t AW
t VS
t ACLK tKOH
Valid output
tKOH
t AS
VIH
VI L
t AVS tAVH
Valid address
tDW
tDH
Valid Input
High - Z
tKHTL
READ Burst Identified
( WE # = HIGH )
t KHTL
Don' t Care
Undefined
Notes: 1.Non-default BCR settings for burst READ followed by asynchronous WRITE using ADV#: fixed or variable latency, latency
code 2 (3 clocks), WAIT active LOW, WAIT asserted during delay.
2.When the device is transitioning between asynchronous and variable-latency burst operations, CE# must go HIGH. CE#
can stay LOW when the device is transitioning from fixed-latency burst READs; asynchronous operation begins at the
falling edge of ADV#. A refresh opportunity must be provided every tCEM. A refresh opportunity is satisfied by either of the
following two conditions: a) clocked CE# HIGH, or b) CE# HIGH for longer than 15ns.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
10.2.19 Asynchronous WRITE Followed by Asynchronous READ
VIH
A[max:16]
VIL
VIH
ADV#
VIL
Valid address
t AVS
t AVH
t AS
t AW
tVP
VIH
WE#
t AVH
tVP
tBHZ
tCVS
t BW
t BA
tCPH
t CVS
t AA
t AADV
t WR
t VS
t HZ
t CO
t CW
Note 1
VIL
OE#
tOLZ
t OE
VIH
VIL
VIL
VOH
tOHZ
tWP
VIH
VIH
A/DQ[15:0]
VIL
WAIT
t AVS
tAS
VIH
LB#/UB#
VIL
CE#
Valid address
t AS
Valid address
t AVS
Valid input
t AVH
tDS
Data Valid address
tAVS t AVH
t DH
VOH
Valid Output
VOL
t AA
tOEW
t AW
tHZ
High - Z
VOL
Don't Care
Undefined
Notes: 1.When configured for synchronous mode (BCR[15] = 0), CE# must remain HIGH for at least 5ns (tCPH) to schedule the
appropriate refresh interval. Otherwise, tCPH is only required after CE#-controlled WRITEs.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
11. PACKAGE DESCRIPTION
11.1 Package Dimension
VFBGA 54BALL (6X8 mm^2,Ball pitch:0.75mm, Ø =0.4mm)
Note:
1. Ball land:0.45mm. Ball opening:0.35mm.
PCB ball land suggested <=0. 35 mm
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
12. REVISION HISTORY
Version
Date
Page
A01-001
02/25/2013
A01-002
03/26/2013
A01-003
05/29/2013
All
2
1~38
All,2
Description
New create document.
Update ordering information.
Add DPD mode.
Update ordering information.
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Publication Release Date : May 29,2013
Revision : A01-003
W956D6HB
64Mb Async./Burst/Sync./A/D MUX
Important Notice
Winbond products are not designed, intended, authorized or warranted for use as components in systems or
equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship
instruments, transportation instruments, traffic signal instruments, combustion control instruments, or for
other applications intended to support or sustain life. Furthermore, Winbond products are not intended for
applications wherein failure of Winbond products could result or lead to a situation wherein personal injury,
death or severe property or environmental damage could occur.
Winbond customers using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify Winbond for any damages resulting from such improper use or sales.
------------------------------------------------------------------------------------------------------------------------------------------------Please note that all data and specifications are subject to change without notice.
All the trademarks of products and companies mentioned in the datasheet belong to their respective owners.
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Publication Release Date : May 29,2013
Revision : A01-003