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IS66WVC2M16ALL
32Mb Async/Page/Burst CellularRAM 1.5
Overview
The IS66WVC2M16ALL is an integrated memory device containing 32Mbit Pseudo Static Random Access
Memory using a self-refresh DRAM array organized as 2M words by 16 bits. The device includes several
power saving modes : Reduced Array Refresh mode where data is retained in a portion of the array and
Temperature Controlled Refresh. Both these modes reduce standby current drain. The device can be
operated in a standard asynchronous mode and high performance burst mode. The die has separate power
rails, VDDQ and VSSQ for the I/O to be run from a separate power supply from the device core.
Features
 Single device supports asynchronous , page,
and burst operation
 Mixed Mode supports asynchronous write and
synchronous read operation
 Dual voltage rails for optional performance
 VDD 1.7V~1.95V, VDDQ 1.7V~1.95V
 Asynchronous mode read access : 70ns
Interpage Read access : 70ns
Intrapage Read access : 20ns
 Burst mode for Read and Write operation
 4, 8, 16,32 or Continuous
 Low Power Consumption
 Asynchronous Operation < 25 mA
 Intrapage Read < 18mA
 Burst operation < 35 mA (@104Mhz)
 Standby < 150 uA(max.)
 Deep power-down (DPD) < 3uA (Typ)
 Low Power Feature
 Reduced Array Refresh
 Temperature Controlled Refresh
 Deep power-down (DPD) mode
 Operation Frequency up to 104Mhz
 Operating temperature Range
Industrial -40°C~85°C
 Package: 54-ball VFBGA
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its
products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services
described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information
and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or
effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to
its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
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IS66WVC2M16ALL
General Description
CellularRAM™ (Trademark of MicronTechnology Inc.) products are high-speed, CMOS
pseudo-static random access memory developed for low-power, portable applications.
The 32Mb DRAM core device is organized as 2 Meg x 16 bits. This device is a variation of
the industry-standard Flash control interface that dramatically increase READ/WRITE
bandwidth compared with other low-power SRAM or Pseudo SRAM offerings.
To operate seamlessly on a burst Flash bus, CellularRAM products have incorporated 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 CellularRAM 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.
CellularRAM products include three 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.
Deep power-down (DPD) enables the system to halt the refresh operation altogether
when no vital information is stored in the device. The system-configurable refresh
mechanisms are adjusted through the RCR.
This CellularRAM device is compliant with the industry-standard CellularRAM 1.5
feature set established by the CellularRAM Workgroup. It includes support for both
variable and fixed latency, with three drive strengths, a variety of wrap options, and a
device ID register (DIDR).
A0~A20
Address
Decode Logic
Refresh
Configuration Register
(RCR)
2048K X 16
DRAM
Memory Array
Input
/Output
Mux
And
Buffers
Device ID Register
(DIDR)
Bus
Configuration Register
(BCR)
CE#
WE#
OE#
CLK
ADV#
CRE
LB#
UB#
WAIT
Rev.A | June 2011
Control
Logic
DQ0~DQ15
[ Functional Block Diagram]
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IS66WVC2M16ALL
54Ball VFBGA Ball Assignment
[Top View]
(Ball Down)
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IS66WVC2M16ALL
Signal Descriptions
All signals for the device are listed below in Table 1.
Table 1. Signal Descriptions
Symbol
Type
VDD
Power Supply
Core Power supply (1.7V~1.95V)
VDDQ
Power Supply
I/O Power supply (1.7V~1.95V)
VSS
Power Supply
All VSS supply pins must be connected to Ground
VSSQ
Power Supply
All VSSQ supply pins must be connected to Ground
DQ0~DQ15
Input / Output
Data Inputs/Outputs (DQ0~DQ15)
A0~A20
Input
Address Input(A0~A20)
LB#
Input
Lower Byte select
UB#
Input
Upper Byte select
CE#
Input
Chip Enable/Select
OE#
Input
Output Enable
WE#
Input
Write Enable
CRE
Input
Control Register Enable: When CRE is HIGH, READ and WRITE operations
access registers.
ADV#
Input
Address Valid signal
Indicates that a valid address is present on the address inputs. Address
can be latched on the rising edge of ADV# during asynchronous Read and
Write operations. ADV# can be held LOW during asynchronous Read and
Write operations.
CLK
Input
Clock
Latches addresses and commands on the first rising CLK edge when
ADV# is active in synchronous mode. CLK must be kept static Low during
asynchronous Read/Write operations and Page Read access operations.
WAIT
Output
WAIT
Data valid signal during burst Read/Write operation. WAIT is used to
arbitrate collisions between refresh and Read/Write operation. WAIT is
also asserted at the end of a row unless wrapping within the burst length.
WAIT is asserted and should be ignored during asynchronous and page
mode operation. WAIT is gated by CE# and is high-Z when CE# is high.
Rev.A | June 2011
Description
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IS66WVC2M16ALL
Functional Description
All functions for the device are listed below in Table 2.
Table 2. Functional Descriptions
Mode
Power
CLK1
ADV#
CE#
OE#
WE#
CRE2
UB#/
LB#
WAIT3
DQ
[15:0]4
Note
Asynchronous Mode
Read
Active
L
L
L
L
H
L
L
Low-Z
Data-out
5
Write
Active
L
L
L
X
L
L
L
Low-Z
Data-in
5
Standby
Stand
by
L
X
H
X
X
L
X
High-Z
High-Z
6,7
No Operation
Idle
L
X
L
X
X
L
X
Low-Z
X
5,7
Configuration
Register Write
Active
L
L
L
H
L
H
X
Low-Z
High-Z
Configuration
Register Read
Active
L
L
L
L
H
H
L
Low-Z
Config-Reg
Out
Deep PowerDown
DPD
L
X
H
X
X
X
X
High-Z
High-Z
10
Synchronous Mode (Burst Mode)
Async read
Active
L
L
L
L
H
L
L
Low-Z
Data-Out
5
Async write
Active
L
L
L
X
L
L
L
Low-Z
Data-In
5
Standby
Stand
by
L
X
H
X
X
L
X
High-Z
High-Z
6,7
No operation
Idle
L
X
L
X
X
L
X
Low-Z
X
5,8
Initial
burst read
Active
L
L
X
H
L
L
Low-Z
X
5,8
Initial
burst write
Active
L
L
H
L
L
X
Low-Z
X
5,8
Burst
continue
Active
H
L
X
X
X
L
Low-Z
Data-In or
Data-Out
5,8
Burst suspend
Active
X
L
H
X
X
X
Low-Z
High-Z
5,8
Configuration
register write
Active
L
L
H
L
H
X
Low-Z
High-Z
8,11
Configuration
register read
Active
L
L
L
H
H
L
Low-Z
Config-Reg
Out
8,11
Deep PowerDown
DPD
X
H
X
X
X
X
High-Z
High-Z
10
Rev.A | June 2011
X
L
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IS66WVC2M16ALL
Notes
1. CLK must be LOW during Async Read and Async Write modes. CLK must be LOW to achieve
low standby current during standby mode and DPD modes. CLK must be static (LOW or HIGH)
during burst suspend.
2. Configuration registers are accessed when CRE is HIGH during the address portion
of a READ or WRITE cycle.
3. WAIT polarity is configured through the bus configuration register (BCR[10]).
4. When UB# and LB# are in select mode (LOW), DQ0~DQ15 are affected as shown.
When only LB# is in select mode, DQ0~DQ7 are affected as shown. When only UB# is
in select mode, DQ8~DQ15 are affected as shown.
5. The device will consume active power in this mode whenever addresses are changed
6. When the device is in standby mode, address inputs and data inputs/outputs are internally
isolated from any external influence.
7. Vin=VDDQ or 0V, all device pins be static (unswitched) in order to achieve standby current.
8. Burst mode operation is initialized through the bus configuration register (BCR[15]).
9. Byte operation can be supported Write & Read at asynchronous mode and Write at
synchronous mode.
10. DPD is initiated when CE# transition from LOW to HIGH after writing RCR[4] to 0. DPD is
maintained until CE# transitions from HIGH to LOW
11. Initial cycle. Following cycles are the same as BURST CONTINUE. CE# must stay LOW
for the equivalent of a single word burst (as indicated by WAIT).
12. When the BCR is configured for sync mode, sync READ and sync WRITE and async WRITE
are supported.
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IS66WVC2M16ALL
Functional Description
In general, this device is high-density alternatives to SRAM and Pseudo SRAM products popular
in low-power, portable applications.
The 32Mb device contains a 33,554,432-bit DRAM core organized as 2,097,152 addresses by
16 bits. This device implements the same high-speed bus interface found on burst mode Flash
products.
The CellularRAM bus interface supports both asynchronous and burst mode transfers.
Page mode accesses are also included as a bandwidth-enhancing extension to the asynchronous
read protocol.
Power-Up Initialization
CellularRAM 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 (see Table 3
and Table 8). VDD and VDDQ must be applied simultaneously.
When they reach a stable level at or above 1.7V, the device will require 150μs to complete
its self-initialization process. During the initialization period, CE# should remain HIGH. When
initialization is complete, the device is ready for normal operation.
Figure 1: Power-Up Initialization Timing
VDD=1.7V
tPU > 150us
VDD
VDDQ
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Device Initialization
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Device ready for
normal operation
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IS66WVC2M16ALL
Bus Operating Modes
CellularRAM products incorporate a burst mode interface targeted at low-power,
wireless applications. This bus interface supports asynchronous, page mode, and burst
mode read and write transfers. The specific interface supported is defined by the value
loaded into the bus configuration register. Page mode is controlled by the refresh configuration
register (RCR[7]).
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 rising edge
of the next clock that ADV# is LOW. During this first clock rising edge, WE# indicates
whether the operation is going to be a READ (WE#=HIGH) or WRITE(WE#=LOW).
The size of a burst can be specified in the BCR either as a fixed length or continuous.
Fixed-length bursts consist of four, eight, sixteen, or thirty-two words. Continuous
bursts have the ability to start at a specified address and burst to the end of the row.
(Row length of 128 words or 256 words is a manufacturer option.)
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 CellularRAM
device. The initial latency for READ operations can be configured as fixed or variable.
(WRITE operations always use fixed latency). Variable latency allows the CellularRAM to
be configured for minimum latency at high clock frequencies, but the controller must
monitor WAIT to detect any conflict with refresh cycles.(see Figure 26).
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.
To access other devices on the same bus without the timing penalty of the initial latency
for a new burst, burst mode can be suspended. Bursts are suspended by stopping CLK.
CLK must be stopped LOW. If another device will use the data bus while the burst is
suspended, OE# should be taken HIGH to disable the CellularRAM outputs; otherwise,
OE# can remain LOW. Note that the WAIT output will continue to be active, and as a
result no other devices should directly share the WAIT connection to the controller. To
continue the burst sequence, OE# is taken LOW, then CLK is restarted after valid data is
available on the bus.
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.
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IS66WVC2M16ALL
Burst Read Operation
After CE# goes LOW, the address to access is latched on the rising edge of the next clock
that ADV# is LOW. During this first clock rising edge, WE# indicates whether the operation
is going to be a READ (WE# = HIGH, Figure 2)
Then the data needs to be output to data bus (DQ0~DQ15) according to set WAIT states.
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 a row, unless wrapping within the burst length.
A full 4 word synchronous read access is shown in Figure 2 and the AC characteristics are specified
in Table 16.
Figure 2. Synchronous Read Access Timing
tABA
tCLK
CLK
VALID
ADDRESS
Address
tSP
tHD
tACLK
DQ0DQ15
tKOH
VALID
OUTPUT
tSP
ADV#
VALID
OUTPUT
tHZ
tHD
tSP
tHD
tHD
WE#
tOLZ
tOHZ
tBOE
OE#
tHZ
tCEW
WAIT
tCBPH
tCEM
CE#
tSP
VALID
OUTPUT
tHD
tCSP
UB#/LB#
VALID
OUTPUT
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
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IS66WVC2M16ALL
Burst Write Operation
After CE# goes LOW, the address to access is latched on the rising edge of the next clock
that ADV# is LOW. During this first clock rising edge, WE# indicates whether the operation
is going to be a WRITE (WE# =LOW, Figure 3).
Data is placed to the data bus (DQ0~DQ15) with consecutive clock cycles when WAIT de-asserts.
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 a row, unless wrapping within the burst length.
A full 4 word synchronous write access is shown in Figure 3 and the AC characteristics are specified in
Table 18.
Figure 3. Synchronous Write Access Timing
tCLK
CLK
VALID
ADDRESS
Address
tSP
DQ0DQ15
tSP
tHD
tHD
DATA IN
DATA IN
DATA IN
DATA IN
tAS
tAS
ADV#
tHD
tCSP
tCEM
CE#
tCBPH
tSP
UB#/LB#
tHD
tHD
tSP
WE#
tHD
tCEW
tKHTL
HiZ
WAIT
Write Burst Identified (WE#=LOW)
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IS66WVC2M16ALL
Asynchronous Mode
Asynchronous mode uses industry-standard SRAM control signals (CE#, OE#, WE#, UB#,
and LB#). READ operations (Figure 4) are initiated by bringing CE#, OE#, UB#/LB# LOW
while keeping WE# HIGH. Valid data will be driven out of the I/Os after the specified access
time has elapsed.
WRITE operations (Figure 5) occur when CE#, WE#, UB#/LB# are driven LOW. During
asynchronous WRITE operations, the OE# level is a “Don't Care,” and WE# will override
OE#. The data to be written is latched on the rising edge of CE#, WE#, UB#/LB#
(whichever occurs first). Asynchronous operations (page mode disabled) can either
use the ADV input to latch the address, or ADV can be driven LOW during the entire
READ/WRITE operations
During asynchronous operation, the CLK input must be held LOW. WAIT will be driven
during asynchronous READs, and its state should be ignored. WE# must not be held
LOW longer than tCEM.
Figure 4. Asynchronous Read Access Timing (ADV# LOW)
tRC = READ cycle Time
Address
VALID
ADDRESS
DQ0DQ15
VALID
OUTPUT
CE#
UB#/LB#
OE#
WE#
Notes:
1. ADV must remain LOW for PAGE MODE operation.
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IS66WVC2M16ALL
Figure 5. Asynchronous Write Access Timing (ADV# LOW)
tWC = WRITE cycle Time
Address
VALID
ADDRESS
DQ0DQ15
VALID
OUTPUT
CE#
UB#/LB#
WE#
< tCEM
OE#
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IS66WVC2M16ALL
Page Mode READ Operation
Page mode is a performance-enhancing extension to the legacy asynchronous READ
operation. In page-mode-capable products, an initial asynchronous read access is
preformed, then adjacent addresses can be read quickly by simply changing the low-order
address. Addresses A[3:0] are used to determine the members of the 16-address CellularRAM
page. Any change in addresses A[4] or higher will initiate a new tAA access time.
Figure 6 shows the timing for a page mode access. Page mode takes advantage of the fact
that adjacent addresses can be read in a shorter period of time than random addresses.
WRITE operations do not include comparable page mode functionality.
During asynchronous page mode operation, the CLK input must be held LOW. CE# must
be driven HIGH upon completion of a page mode access. WAIT will be driven while the device
is enabled and its state should be ignored. Page mode is enabled by setting RCR[7] to HIGH.
ADV must be driven LOW during all page mode READ accesses.
Due to refresh considerations, CE# must not be LOW longer than tCEM.
Figure 6. Page Mode READ Operation (ADV# LOW)
Address
ADD0
tAA
DQ0DQ15
ADD1
tAPA
D0
ADD2
tAPA
D1
ADD3
tAPA
D2
D3
CE#
UB#/LB#
OE#
WE#
Notes:
1. ADV must remain LOW for PAGE MODE operation.
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IS66WVC2M16ALL
Mixed-Mode Operation
The device can support a combination of synchronous READ and asynchronous READ
and WRITE operations when the BCR is configured for synchronous operation. The
asynchronous READ and WRITE operations require that the clock (CLK) remain 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. See Figure 45 for the
“Asynchronous WRITE Followed by Burst READ” timing diagram.
WAIT Operation
WAIT output on the CellularRAM 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.
When a synchronous READ or WRITE operation has been initiated, WAIT goes active to
indicate that the CellularRAM 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 CellularRAM device. When WAIT transitions to an
inactive state, the data burst will progress on successive rising 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 READ operations launched while an on-chip refresh is in progress. If
a collision occurs, the WAIT pin is asserted for additional clock cycles until the refresh
has completed (see Figure 26). When the refresh operation has completed, the
READ operation will continue normally.
WAIT will be asserted but should be ignored during asynchronous READ and WRITE and
page READ operations.
WAIT will be High-Z during asynchronous WRITE operations.
By using fixed initial latency (BCR[14] = 1), this CellularRAM device can be used in burst
mode without monitoring the WAIT pin. 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.
UB#/LB# Operation
The UB#/LB# 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#, UB#, and LB# whichever occurs first.
UB#/LB# must be LOW during synchronous READ cycles.
When UB#/LB# 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.
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IS66WVC2M16ALL
Low-Power Feature
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.
Temperature-Compensated Refresh
Temperature-compensated refresh (TCR) allows for adequate refresh at different
temperatures. This CellularRAM device includes an on-chip temperature sensor that
automatically adjusts the refresh rate according to the operating temperature. The
device continually adjusts the refresh rate to match that temperature.
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 (see
Table 9). READ and WRITE operations to address ranges
receiving refresh will not be affected. Data stored in addresses not receiving refresh will
become corrupted. When re-enabling additional portions of the array, the new portions
are available immediately upon writing to the RCR.
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 CellularRAM 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. 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 10us.
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IS66WVC2M16ALL
Registers
Two user-accessible configuration registers define the device operation. The bus
configuration register (BCR) defines how the CellularRAM 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.
Access Using CRE
The registers can be accessed using either a synchronous or an asynchronous operation
when the configuration register enable (CRE) input is HIGH (see Figures 7 through 10). When CRE is
LOW, a READ or WRITE operation will access the memory array. The configuration register values are
written via A[20:0]. 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] is 10b; the RCR is accessed when A[19:18] is 00b; the
DIDR is accessed when A[19:18] is 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
Figure 7: Configuration Register WRITE
– Asynchronous Mode, Followed by READ ARRAY Operation
Address
VALID
ADDRESS
OPCODE1
tAVS
tAVH
DQ0DQ151
tAVS tAVH
VALID
OUTPUT
tVS
tAADV
tVP
ADV#
tVP
tCVS
tCVS
tCW
CE#
tCPH
tHZ
tCO
tBA
UB#/LB#
tWP
WE#
Write Address Bus
Value to Control
Register
OE#
tAVS
tOLZ
tOE
tAVH
CRE2
Notes:
1. A[19:18] = 00b to load RCR, and 10b to load BCR.
2. CRE must be HIGH to access registers.
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IS66WVC2M16ALL
Figure 8: Configuration Register WRITE
– Synchronous Mode Followed by READ ARRAY Operation
tABA
tCLK
CLK
Address
VALID
ADDRESS
OPCODE2
tSP tHD
tSP tHD
tACLK
DQ0DQ15
tKOH
VALID VALID VALID VALID
OUTPUTOUTPUTOUTPUTOUTPUT
tSP tHD
ADV#
tCBPH3
tCSP
tCEM
tCEM
CE#
tHD
UB#/LB#
tSP tHD
WE#
tOHZ
tBOE
OE#
WAIT
tCEW
tKHTL
HiZ
tHZ
tCEW
tKHTL
tHD
CRE4
tSP
Notes:
1. Non-default BCR settings for configuration register WRITE in synchronous mode, followed by READ ARRAY
operation: Latency code two (three clocks); WAIT active LOW; WAIT asserted during delay.
2. A[19:18] = 00b to load RCR, 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.
4. CRE must be HIGH to access registers.
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IS66WVC2M16ALL
Figure 9: Configuration Register READ
– Asynchronous Mode Followed by DATA READ
tAA
Select
Control
Register1
Address
tAVS
VALID
ADDRESS
tAVH
DQ0DQ15
tAVS tAVH
VALID
OUTPUT
CR Valid
tAADV
tAADV
tVP
ADV#
tVP
tCPP
tCO
CE#
tCPH
tHZ
tCO
tBLZ
tBA
UB#/LB#
tBA
WE#
tOLZ
tOE
OE#
tAVS
tOE
tAVH
CRE2
Notes:
1. A[19:18] = 00b to read RCR, 10b to read BCR, and 01b to read DIDR
2. CRE must be HIGH to access registers.
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IS66WVC2M16ALL
Figure 10: Configuration Register READ
– Synchronous Mode Followed by Data READ
tABA
tCLK
CLK
Select
Control
Register2
Address
VALID
ADDRESS
tACLK
tSP tHD
DQ0DQ15
tKOH
tSP tHD
CR
valid
tSP
ADV#
tACLK
tKOH
VALID VALID VALID VALID
OUTPUTOUTPUTOUTPUTOUTPUT
tHD
tCBPH3
tCSP
tCEM
tABA
CE#
tHD
tSP
UB#/LB#
tSP tHD
WE#
tOHZ
tBOE
OE#
WAIT
tCEW
tKTHL
HiZ
tHZ
tCEW
tKHTL
tHD
CRE4
tSP
Notes:
1. Non-default BCR settings for configuration register READ in synchronous mode, followed by READ ARRAY
operation: Latency code three (four clocks); WAIT active LOW; WAIT asserted during delay.
2. A[19:18] = 00b to read RCR, 10b to read BCR, to 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.
4. CRE must be HIGH to access registers.
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IS66WVC2M16ALL
Software Access Sequence
Software access of the configuration registers uses a sequence of asynchronous READ
and asynchronous WRITE operations. The contents of the configuration registers can be
read or modified 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 (see
Figure 11). The read sequence is virtually identical except that an asynchronous READ is
performed during the fourth operation (see Figure 12). The address used during all
READ and WRITE operations is the highest address of the CellularRAM device being
accessed (1FFFFFh); 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 or the 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;
if the data is 0002h, the sequence will access the DIDR. During the fourth operation,
DQ[15:0] transfer data in to or out of bits 15:0 of the control 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 the control register enable
(CRE) pin. If the software mechanism is used, the CRE pin can simply be tied to VSS.
The port line often used for CRE control purposes is no longer required.
Figure 11 : Configuration Register Write
Address
MAX
ADDRESS
DQ0DQ15
CE#
MAX
ADDRESS
OUTPUT
DATA
Read
MAX
ADDRESS
MAX
ADDRESS
OUTPUT
DATA
Read
CR
VALUE IN
*Note1
Write
Write
UB#/LB#
WE#
OE#
Notes :
1. RCR : 0000h , BCR : 0001h
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IS66WVC2M16ALL
Figure 12 : Configuration Register Read
Address
MAX
ADDRESS
DQ0DQ15
CE#
MAX
ADDRESS
OUTPUT
DATA
Read
MAX
ADDRESS
OUTPUT
DATA
Read
MAX
ADDRESS
CR
VALUE OUT
*Note1
Write
Read
UB#/LB#
WE#
OE#
Notes :
1. RCR : 0000h , BCR : 0001h , DIDR : 0002h
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IS66WVC2M16ALL
Bus Configuration Register
The BCR defines how the CellularRAM device interacts with the system memory bus.
Table 3 describes the control bits in the BCR. At power-up, the BCR is set to 1D1Fh.
The BCR is accessed using CRE and A[19:18] = 10b, or through the configuration
register software sequence with DQ[15:0] = 0001h on the third cycle.
Table 3. Bus configuration Register
Remark
Bit Number
Definition
20
Reserved
Must be set to “0”
19 – 18
Register Select
00 = Select RCR
01 = Select DIDR
10 = Select BCR
17 – 16
Reserved
Must be set to “0”
15
Operating mode
14
Initial Latency
0 = Variable (default)
1 = Fixed
13 – 11
Latency Count
000 =
001 =
010 =
011 =
100 =
101 =
110 =
111 =
10
WAIT Polarity
0 = Active LOW : Data valid at WAIT HIGH
1 = Active HIGH : Data valid at WAIT LOW (default)
9
Reserved
8
WAIT Configuration
7–6
Reserved
9 clock cycles
reserved
3 clock cycles
4 clock cycles (default)
5 clock cycles
6 clock cycles
7 clock cycles
reserved
Must be set to “0”
0 = Asserted during delay
1 = Asserted one data cycle before delay (default)
Must be set to “0”
00 =
01 =
10 =
11 =
Full drive
½ Drive (default)
¼ Drive
Reserved
5–4
Output Impedance
3
Burst mode
0 = Burst wrap within the burst length
1 = Burst no wrap (default)
Burst Length
001 = 4 words
010 = 8 words
011 = 16 words
100 = 32 words
111 = continuous (default)
Others = Reserved
2–0
Notes :
0 = Synchronous burst access mode
1 = Asynchronous access mode (default)
1.Burst wrap and length apply to both READ and WRITE operations.
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IS66WVC2M16ALL
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 four, eight, sixteen, or thirty-two
words. The device can also be set in continuous burst mode where data is accessed
sequentially up to the end of the row.
Burst Wrap (BCR[3]) Default = No Wrap
The burst-wrap option determines if a 4-, 8-, 16, 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 up to the end of the row.
Table 4. Sequence and Burst Length
Starting
Address
Wrap
BL4
BL8
BL16
BL32
Continuous
DEC
BCR[3]
Linear
Linear
Linear
Linear
Linear
0
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3- ••• -12-13-14-15
0-1-2-3- ••• -28-29-30-31
0-1-2-3-4-5-6- •••
1
1-2-3-0
1-2-3-4-5-6-7-0
1-2-3-4- ••• -13-14-15-0
1-2-3-4- ••• -29-30-31-0
1-2-3-4-5-6-7- •••
2
2-3-0-1
2-3-4-5-6-7-0-1
2-3-4-5- ••• -14-15-0-1
2-3-4-5- ••• -30-31-0-1
2-3-4-5-6-7-8- •••
3
3-0-1-2
3-4-5-6-7-0-1-2
3-4-5-6- ••• -15-0-1-2
3-4-5-6- ••• -31-0-1-2
3-4-5-6-7-8-9- •••
•••
•••
•••
•••
•••
•••
6
6-7-4-5
6-7-0-1-2-3-4-5
6-7-8-9- ••• -2-3-4-5
6-7-8-9- ••• -2-3-4-5
6-7-8-9-10-11-12- •••
7-4-5-6
7-0-1-2-3-4-5-6
7-8-9-10- ••• -3-4-5-6
7-8-9-10- ••• -3-4-5-6
7-8-9-10-11-12-13- •••
•••
•••
•••
•••
•••
14
14-15-12-13
14-15-8-9-10-11-12-13
14-15-0-1- ••• -10-11-12-13
30-31-0-1- ••• -26-27-28-29
14-15-16-17-18-19-20•••
15
15-12-13-14
15-8-9-10-11-12-13-14
15-0-1-2-3- ••• -11-13-13-14
31-0-1-2-3- ••• -27-28-29-30
15-16-17-18-19-20-21•••
•••
•••
•••
•••
•••
•••
254
254-255-252-253
254-255-248-••• -252-253
254-255-240-241- ••• -252-253
254-255-224-225- ••• -252-253
254-255-0-1-2-•••
255
255-252-253-254
255-248-249- ••• -253-254
255-240-241-242- ••• -253-254
255-224-225-226- ••• -253-254
255-0-1-2-•••
0
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3-4- ••• -12-13-14-15
0-1-2-3- ••• -28-29-30-31
0-1-2-3-4-5-6- •••
1
1-2-3-4
1-2-3-4-5-6-7-8
1-2-3-4- ••• -13-14-15-16
1-2-3-4- ••• -29-30-31-32
1-2-3-4-5-6-7- •••
7
•••
“0”
Wrap
2
2-3-4-5
2-3-4-5-6-7-8-9
2-3-4-5- ••• -14-15-16-17
2-3-4-5- ••• -30-31-32-33
2-3-4-5-6-7-8- •••
3
3-4-5-6
3-4-5-6-7-8-9-10
3-4-5-6- ••• -15-16-17-18
3-4-5-6- ••• -31-32-33-34
3-4-5-6-7-8-9- •••
•••
•••
•••
•••
•••
•••
6
7
•••
“1”
No
Wrap
6-7-8-9
6-7-8-9-10-11-12-13
6-7-8-9- ••• -18-19-20-21
6-7-8-9- ••• -34-35-36-37
6-7-8-9-10-11-12- •••
7-8-9-10
7-8-9-10-11-12-13-14
7-8-9-10- ••• -19-20-21-22
7-8-9-10- ••• -35-36-37-38
7-8-9-10-11-12-13- •••
•••
•••
•••
•••
•••
14
14-15-16-17
14-15-16-17-18-19-20-21
14-15-16-17- ••• - 26-27-28-29
14-15-16-17- ••• - 42-43-44-45
14-15-16-17-18-19-20•••
15
15-16-17-18
15-16-17-18-19-20-21-22
15-16-17-18- ••• -27-28-29-30
15-16-17-18- ••• -43-44-45-46
15-16-17-18-19-20-21•••
•••
•••
•••
•••
•••
•••
254
254-255
254-255
254-255
254-255
254-255
255
255
255
255
255
255
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IS66WVC2M16ALL
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 + CellularRAM) 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 CellularRAM device in a more heavily loaded data bus environment. Outputs are
configured at half-drive strength during testing. See Table 5 for additional information.
Table 5. 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
104MHz at light load
1
0
1/4
100
CL = 15pF or lower
1
1
Reserved
WAIT Configuration (BCR[8]) Default = WAIT Transitions One 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 (see Figure 13).
Figure 13. WAIT Configuration During Burst Operation
CLK
DQ0DQ15
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
WAIT
BCR[8]=0
Data valid/invalid in current cycle
WAIT
BCR[8]=1
Data valid/invalid in next cycle
Notes :
Non-default BCR setting : WAIT active LOW
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.
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IS66WVC2M16ALL
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. Latency codes from two
(three clocks) to six (seven clocks) are supported (see Tables 6 and 7, Figure 14, and
Figure 15).
Initial Access Latency (BCR[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. (See Table 7 and Figure 15)
Table 6. Variable Latency Configuration Codes (BCR[14] = 0)
Latency
Latency
Configuration
Code
BCR
[13:11]
Max Input CLK Frequency (MHz)
Normal
Refresh
Collision
-96
-12
66 (15.0ns)
52 (18.5ns)
104 (9.62ns)
80 (12.5ns)
-
-
010
2 (3 clocks)
2
4
011
3 (4 clocks)-default
3
6
100
4 (5 clocks)
4
8
Reserved
-
-
others
Notes:
1. Latency is the number of clock cycles from the initialization of a burst operation until data appears.
Data is transferred on the next clock cycle.
Figure 14. Latency Counter (Variable Latency, No Refresh Collision)
A[20:0]
VALID
ADDRESS
CLK
ADV#
Code 2 (3 clocks)
DQ0DQ15
VALID
ADDRESS
DQ0DQ15
VALID
ADDRESS
DQ0DQ15
VALID
ADDRESS
Rev.A | June 2011
Code 3 (4 clocks) : Default
Code 4 (5 clocks)
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
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IS66WVC2M16ALL
Table 7. Fixed Latency Configuration Codes (BCR[14] = 1)
Latency
Configuration
Code
BCR
[13:11]
Latency
Count (N)
Max Input CLK Frequency (MHz)
-96
-12
010
2 (3 clocks)
2
33 (30ns)
25 (40ns)
011
3 (4 clocks)-default
3
52 (19.2ns)
40 (25ns)
100
4 (5 clocks)
4
66 (15.0ns)
52 (19.2ns)
101
5 (6 clocks)
5
75 (13.3ns)
66 (15.0ns)
110
6 (7 clocks)
6
104 (9.62ns)
80 (12.5ns)
Reserved
-
-
-
others
Figure 15. Latency Counter (Fixed Latency)
Cycle N
CLK
ADV#
tAADV
CE#
tCO
tAA
A[20:0]
VALID
ADDRESS
DQ0DQ15
(READ)
DQ0DQ15
(WRITE)
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
INPUT
VALID
INPUT
VALID
INPUT
Burst Identified
(ADV#=LOW)
Operating Mode (BCR[15]) Default = Synchronous Operation
The operating mode bit selects either synchronous burst operation or the default asynchronous
mode of operation
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IS66WVC2M16ALL
Refresh Configuration Register
The refresh configuration register (RCR) defines how the CellularRAM device performs
its transparent self refresh. Altering the refresh parameters can dramatically reduce
current consumption during standby mode. Table 8 describes the control bits used in
the RCR. At power-up, the RCR is set to 0010h
The RCR is accessed using CRE and A[19:18] = 00b, or through the configuration
register software access sequence with DQ = 0000h on the third cycle (see “Registers”)
Table 8. Refresh Configuration Register
Bit Number
Definition
20
Reserved
Must be set to “0”
19 – 18
Register Select
00 = Select RCR
01 = Select DIDR
10 = Select BCR
17 – 8
Reserved
Must be set to “0”
7
Page
6–5
Reserved
4
DPD
3
Reserved
2–0
Rev.A | June 2011
Partial Refresh
Remark
0 = Page Mode disabled (default)
1 = Page Mode enable
Setting is ignored (Default 00b)
0 = DPD enable
1 = DPD disable (default)
Must be set to “0”
000 =
001 =
010 =
011 =
100 =
101 =
110 =
111 =
Full array (default)
Bottom 1/2 array
Bottom 1/4 array
Bottom 1/8 array
None of array
Top 1/2 array
Top 1/4 array
Top 1/8 array
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IS66WVC2M16ALL
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 (see Table 9)
Table 9. 32Mb Address Patterns for PAR (RCR[4]=1)
RCR[2]
RCR[1]
RCR[0]
Active Section
Address Space
Size
Density
0
0
0
Full
000000h ~ 1FFFFFh
2MX16
32Mb
0
0
1
Bottom 1/2 array
000000h ~ 0FFFFFh
1MX16
16Mb
0
1
0
Bottom 1/4 array
000000h ~ 07FFFFh
512KX16
8Mb
0
1
1
Bottom 1/8 array
000000h ~ 03FFFFh
256KX16
4Mb
1
0
0
None of array
0
1
0
1
Top 1/2 array
100000h ~ 1FFFFFh
1MX16
16Mb
1
1
0
Top 1/4 array
180000h ~ 1FFFFFh
512KX16
8Mb
1
1
1
Top 1/8 array
1C0000h ~ 1FFFFFh
256KX16
4Mb
0Mb
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 CellularRAM 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. Taking CE# LOW
disables DPD and sets RCR[4] = 1; it is not necessary to write to the RCR to disable DPD. DPD
can be enabled using CRE or the software sequence to access the RCR. BCR and RCR
values (other than BCR[4]) are preserved during DPD.
Page Mode Operation (RCR[7]) Default = Disabled
The Page mode operation bit determines whether page mode is enabled for asynchronous
READ operations. In the power-up default state, page mode is disabled
Device Identification Register
The DIDR provides information on the device manufacturer, CellularRAM generation,
and the specific device configuration. Table 10 describes the bit fields in the DIDR. This
register is read-only.
The DIDR is accessed with CRE HIGH and A[19:18] = 01b, or through the software access
sequence with DQ = 0002h on the third cycle.
Table 10. 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
Rev.A | June 2011
Length
- words
Bit
Setting
Version
Bit
Setting
Density
Bit
Setting
Genera
tion
Bit
Setting
Vendor
Bit
Setting
128
0b
1st
0000b
16Mb
000b
CR1.5
010b
ISSI
00101b
256
1b
2nd
0001b
32Mb
001b
CR2.0
011b
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IS66WVC2M16ALL
Electrical Characteristics
Table 11. Absolute Maximum Ratings
Parameter
Rating
Voltage to Any Ball Except VDD, VDDQ Relative to VSS
-0.3V to VDDQ + 0.3V
Voltage on VDD Supply Relative to VSS
-0.2V to +2.45V
Voltage on VDDQ Supply Relative to VSS
-0.2V to +2.45V
Storage Temperature (plastic)
-55°C to +150°C
Operating Temperature (case)
-40°C to +85°C
Soldering Temperature and Time
+260°C
10s (solder ball only)
Notes:
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 this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect reliability.
Table 12. Electrical Characteristics and Operating Conditions
Industrial Temperature (–40ºC < TC < +85ºC)
Description
Conditions
MIN
MAX
Unit
VDD
1.7
1.95
V
I/O Supply Voltage
VDDQ
1.7
1.95
V
Input High Voltage
VIH
VDDQ-0.4
VDDQ+0.2
V
1
Input Low Voltage
VIL
-0.20
0.4
V
2
0.80 VDDQ
V
3
3
Supply Voltage
Symbol
Note
Output High Voltage
IOH = -0.2mA
VOH
Output Low Voltage
IOL = +0.2mA
VOL
0.20 VDDQ
V
VIN = 0 to VDDQ
ILI
1
uA
Output Leakage Current
OE#=VIH or
Chip Disabled
ILO
1
uA
Operating Current
Conditions
MAX
Unit
Note
Input Leakage Current
Symbol
TYP
Asynchronous Random
READ/WRITE
IDD1
-70
25
mA
4
Asynchronous
PAGE READ
IDD1P
-70
18
mA
4
104Mhz
35
80Mhz
30
mA
4
104Mhz
30
80Mhz
25
mA
4
104Mhz
35
80Mhz
30
mA
4
uA
5
Initial Access, Burst
READ/WRITE
VIN = VDDQ or 0V
Chip enabled,
IOUT = 0
IDD2
Continuous Burst READ
IDD3R
Continuous Burst WRITE
IDD3W
Standby Current
Rev.A | June 2011
VIN=VDDQ or 0V
CE#=VDDQ
ISB
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IS66WVC2M16ALL
Notes:
1. Input signals may overshoot to VDDQ + 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.
User must add required current to drive output capacitance expected in the actual system.
5. ISB (MAX) values measured with PAR set to FULL ARRAY at +85°C. In order to achieve low
standby current, all inputs must be driven to either VDDQ or VSS. ISB might be set slightly
higher for up to 500ms after power-up, or when entering standby mode.
Table 13. Deep Power-Down Specifications
Description
Deep Power-Down
Notes:
Conditions
Symbol
TYP
MAX
Unit
VIN=VDDQ or 0V
VDD,VDDQ=1.95V, +85°C
IDPD
3
10
uA
Typical (TYP) IDPD value applies across all operating temperatures and voltages.
Table 14. Capacitance
Description
Input Capacitance
Input/Output Capacitance (DQ)
Notes:
Conditions
Symbol
MIN
MAX
Unit
Note
TC=+25°C;
f=1Mhz;
VIN=0V
CIN
2.0
6.0
pF
1
CIO
3.5
6
pF
1
1. These parameters are verified in device characterization and are not 100% tested.
Figure 16. AC Input/Output Reference Waveform
VDDQ
∫∫
VDDQ/22 Output
Test Points
VSS
VDDQ/23 Output
∫∫
Notes:
1. AC test inputs are driven at VDDQ for a logic 1 and VSS for a logic 0. Input rise and fall times
(10% to 90%) < 1.6ns.
2. Input timing begins at VDDQ/2.
3. Output timing ends at VDDQ/2.
Figure 17. Output Load Circuit
Test Point
50Ω
VDDQ/2
DUT
30pF
Notes:
All tests are performed with the outputs configured for default setting of half drive strength (BCR[5:4] = 01b).
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IS66WVC2M16ALL
AC Characteristics
Table15 . Asynchronous READ Cycle Timing Requirements
Symbol
Parameter
70ns
Min
Max
Unit
Notes
tAA
Address Acess Time
70
ns
tAADV
ADV# Access Time
70
ns
tAPA
Page Access Time
20
ns
tAVH
Address hold from ADV# HIGH
2
ns
tAVS
Address setup to ADV# HIGH
5
ns
tBA
UB#, LB# Access Time
70
ns
tBHZ
UB#, LB# Disable to High-Z Output
8
ns
1
tBLZ
UB#, LB# Enable to Low-Z Output
ns
2
tCEM
Maximum CE# pulse width
4
us
3
tCEW
CE# low to WAIT Valid
7.5
ns
tCO
Chip Select Access Time
70
ns
tCVS
CE# low to ADV# HIGH
tHZ
Chip Disable to DQ and WAIT High-Z Output
tLZ
Chip enable to Low-Z output
tOE
OE# low to Valid Output
tOH
Output hold from address change
tOHZ
Output disable to DQ High-Z output
tOLZ
Output enable to Low-Z output
tPC
10
1
7
ns
8
10
20
5
ns
1
ns
2
ns
ns
8
ns
1
3
ns
2
Page READ cycle time
20
ns
tRC
READ cycle time
70
ns
tVP
ADV# Low pulse width
5
ns
Notes:
1. Low-Z to High-Z timings are tested with the circuit shown in Figure 17. The High-Z timings
measure a 100mV transition from either VOH or VOL toward VDDQ/2.
2. High-Z to Low-Z timings are tested with the circuit shown in Figure 17. The Low-Z timings
measure a 100mV transition away from the High-Z (VDDQ/2) level toward either VOH or
VOL.
3. Page mode enable only
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IS66WVC2M16ALL
Table16 . Burst READ Cycle Timing Requirements
-7010
-7008
Symbol
Parameter
tAA
Address Acess Time (Fixed Latency)
70
70
ns
tAADV
ADV# Access Time (Fixed Latency)
70
70
ns
tABA
Burst to READ Access Time
(Variable Latency)
35.9
46.5
ns
tACLK
CLK to Output Delay
7
9
ns
tAVH
Address hold from ADV# HIGH
(Fixed Latency)
tBOE
Burst OE# LOW to Output Valid
tCBPH
CE# High between Subsequent
Burst or Mixed-Mode Operations
tCEM
Maximum CE# Pulse width
tCEW
CE# low to WAIT Valid
tCLK
CLK Period
tCO
Chip Select Access Time (Fixed
Latency)
tCSP
CE# Setup Time to Active CLK Edge
3
4
ns
tHD
Hold Time from Active CLK Edge
2
2
ns
tHZ
Chip Disable to DQ and WAIT
High-Z Output
Min
Max
2
Min
5
20
7.5
9.62
1
ns
1
4
us
1
7.5
ns
ns
12.5
70
Note
ns
6
4
Unit
ns
2
20
1
Max
70
ns
8
8
ns
1.6
1.8
ns
7
9
ns
8
ns
2
3
tKHKL
CLK rise or fall Time
tKHTL
CLK to WAIT Valid
tKOH
Output HOLD from CLK
2
2
tKP
CLK HIGH or LOW time
3
4
tOHZ
Output disable to DQ High-Z Output
tOLZ
Output enable to DQ Low-Z output
3
3
ns
tSP
Setup time to Active CLK Edge
3
3
ns
8
2
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#, or b) CE# HIGH for longer than 15ns
2. Low-Z to High-Z timings are tested with the circuit shown in Figure 17.
The High-Z timings measure a 100mV transition from either VOH or VOL toward VDDQ/2.
3. High-Z to Low-Z timings are tested with the circuit shown in Figure 17. The
Low-Z timings measure a 100mV transition away from the High-Z (VDDQ/2) level toward
either VOH or VOL.
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IS66WVC2M16ALL
Table17 . Asynchronous WRITE Cycle Timing Requirements
Symbol
Parameter
70ns
Min
Max
Unit
tAS
Address and ADV# LOW Setup Time
0
ns
tAVH
Address hold from ADV# HIGH
2
ns
tAVS
Address setup to ADV# HIGH
5
ns
tAW
Address Valid to End of Write
70
ns
tBW
UB#, LB# Select to End of Write
70
ns
tCEW
CE# low to WAIT Valid
1
tCPH
CE# HIGH between Subsequent
Asynchronous cycles
5
ns
tCVS
CE# low to ADV# HIGH
7
ns
tCW
Chip Enable to End of Write
70
ns
tDH
Data Hold from Write Time
0
ns
tDW
Data Write Setup Time
20
ns
tHZ
Chip Disable to DQ and WAIT High-Z Output
tLZ
Chip enable to Low-Z output
tOW
7.5
8
Notes
ns
ns
1
10
ns
2
End WRITE to Low-Z output
5
ns
2
tVP
ADV# Low pulse width
5
ns
tVS
ADV# Setup to End of Write
70
ns
tWC
WRITE cycle time
70
ns
tWHZ
WRITE to DQ High-Z Output
tWP
WRITE Pulse Width
tWPH
tWR
8
ns
1
45
ns
3
WRITE pulse width HIGH
10
ns
WRITE Recovery Time
0
ns
Notes:
1. Low-Z to High-Z timings are tested with the circuit shown in Figure 17. The
High-Z timings measure a 100mV transition from either VOH or VOL toward VDDQ/2.
2. High-Z to Low-Z timings are tested with the circuit shown in Figure 17.
The Low-Z timings measure a 100mV transition away from the High-Z (VDDQ/2) level toward
either VOH or VOL.
3. WE# must be limited to tCEM (4us)
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IS66WVC2M16ALL
Table18 . Burst WRITE Cycle Timing Requirements
Symbol
-7010
Parameter
Min
-7008
Max
Min
Max
Unit
Note
1
tAS
Address and ADV# LOW Setup
Time
0
0
ns
tAVH
Address hold from ADV# HIGH
(Fixed Latency)
2
2
ns
tCBPH
CE# High between Subsequent
Burst or Mixed-Mode Operations
5
6
ns
2
tCEM
Maximum CE# Pulse width
4
us
2
tCEW
CE# low to WAIT Valid
7.5
ns
tCLK
CLK Period
tCSP
4
1
7.5
1
9.62
12.5
ns
CE# Setup Time to Active CLK
Edge
3
4
ns
tHD
Hold Time from Active CLK Edge
2
2
ns
tHZ
Chip Disable to DQ and WAIT
High-Z Output
tKHKL
CLK rise or fall Time
tKHTL
CLK to WAIT Valid
8
8
ns
1.6
1.8
ns
7
9
ns
tKP
CLK HIGH or LOW time
3
4
ns
tSP
Setup time to Active CLK Edge
3
3
ns
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#, or b) CE# HIGH for longer than 15ns
3. Low-Z to High-Z timings are tested with the circuit shown in Figure 17.
The High-Z timings measure a 100mV transition from either VOH or VOL toward VDDQ/2.
Table19 . Initialization and DPD Timing Requirements
Symbol
Parameter
-70
Min
Max
Unit
tDPD
Time from DPD entry to DPD exit
150
us
tDPDX
CE# LOW time to exit DPD
10
us
tPU
Initialization Period (required before normal operations)
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150
Notes
us
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IS66WVC2M16ALL
Timing Diagrams
Figure 18: Power-Up Initialization Timing
VDD(MIN)
VDD, VDDQ=1.7V
tPU > 150us
Device ready for
normal operation
Device Initialization
Figure 19: DPD Entry and Exit Timing Parameters
tDPD
tDPDX
tPU
DPD Enabled
DPD Exit
CE#
Write
RCR[4]=0
Device Initialization Device ready for
normal operation
Figure 20: Asynchronous READ
tRC
Address
VALID
ADDRESS
tAA
DQ0DQ15
VALID
OUTPUT
ADV#
CE#
tCO
tHZ
tLZ
tBHZ
tBA
UB#/LB#
tOLZ
tOE
OE#
WE#
WAIT
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tOHZ
tCEW
HiZ
tHZ
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HiZ
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IS66WVC2M16ALL
Figure 21: Asynchronous READ Using ADV#
tAA
Address
VALID
ADDRESS
tAVS
tAVH
DQ0DQ15
VALID
OUTPUT
tAADV
tVP
ADV#
tCVS
CE#
tCO
tHZ
tLZ
tBHZ
tBA
UB#/LB#
tOLZ
tOE
OE#
WE#
WAIT
Rev.A | June 2011
tOHZ
tCEW
HiZ
tHZ
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HiZ
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IS66WVC2M16ALL
Figure 22: PAGE MODE READ
tRC
A4-A20
VALID
ADDRESS
tPC
A0-A3
VALID
ADDRESS
VALID
ADDRESS
tAA
VALID
ADDRESS
VALID
ADDRESS
tAPA
DQ0DQ15
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
tOH
ADV#
tCO
CE#
tHZ
tLZ
tBHZ
tBA
UB#/LB#
tOHZ
tOLZ
tOE
OE#
WE#
WAIT
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tCEW
tHZ
HiZ
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HiZ
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IS66WVC2M16ALL
Figure 23: CLK Timings for Burst Operations
tCLK
tKHKL
Notes :
tCLK
tKP
tKP
1. For Burst timing diagrams, non-default BCR settings are shown
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IS66WVC2M16ALL
Figure 24: Single Access Burst READ Operation – Variable Latency without refresh collision
tABA
tCLK
CLK
VALID
ADDRESS
Address
tSP
tACLK
tHD
DQ0DQ15
tKOH
VALID
OUTPUT
tSP
ADV#
tCSP
CE#
tHD
tHD
tCEM
tSP
UB#/LB#
WE#
tHD
tOLZ
tBOE
OE#
tHZ
tCEW
WAIT
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
Notes:
1. Non-default variable latency BCR settings for single-access burst READ operation: Latency
code two (three clocks); WAIT active LOW; WAIT asserted during delay.
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IS66WVC2M16ALL
Figure 25: Four-Word Burst READ Operation – Variable Latency without refresh collision
tABA
tCLK
CLK
VALID
ADDRESS
Address
tSP
tACLK
tHD
DQ0DQ15
tKOH
VALID
OUTPUT
tSP
ADV#
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
tHD
tHZ
tHD
tCSP
tCEM
CE#
tSP
UB#/LB#
tSP
tHD
tHD
WE#
tOLZ
tOHZ
tBOE
OE#
tHZ
tCEW
WAIT
tCBPH
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
Notes:
1. Non-default variable latency BCR settings for 4-word burst READ operation: Latency code
two (three clocks); WAIT active LOW; WAIT asserted during delay.
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IS66WVC2M16ALL
Figure 26: Four-Word Burst READ Operation – Variable Latency with refresh collision
tCLK
CLK
VALID
ADDRESS
Address
tSP
tACLK
tHD
DQ0DQ15
tKOH
VALID
OUTPUT
tSP
ADV#
VALID
OUTPUT
tHZ
tHD
tCBPH
tCEM
CE#
tSP
tSP
VALID
OUTPUT
tHD
tCSP
UB#/LB#
VALID
OUTPUT
tHD
tHZ
tHD
WE#
tOLZ
tBOE
OE#
tCEW
WAIT
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
Notes:
1. Non-default variable latency BCR settings for 4-word burst READ operation: Latency code
two (three clocks); WAIT active LOW; WAIT asserted during delay.
2. If refresh collision happened, WAIT will be asserted between the latency count number of clock cycles
and 2x the latency count
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IS66WVC2M16ALL
Figure 27: Single Access Burst READ Operation – Fixed Latency
tCLK
CLK
tAA
VALID
ADDRESS
Address
tSP
tKOH
tAVH
DQ0DQ15
VALID
OUTPUT
tAADV
tSP
ADV#
tHD
tHD
tCO
tCSP
CE#
tCEM
tSP
UB#/LB#
tSP
tHZ
tHD
tHD
WE#
tOHZ
tOLZ
tBOE
OE#
tHZ
tCEW
WAIT
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
Notes:
1. Non-default fixed latency BCR settings for single-access burst READ operation: Fixed Latency;
Latency code four (five clocks); WAIT active LOW; WAIT asserted during delay.
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IS66WVC2M16ALL
Figure 28: Four-Word Burst READ Operation – Fixed Latency
tCLK
CLK
tAA
VALID
ADDRESS
Address
tSP
tKOH
tAVH
DQ0DQ15
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
tHZ
tAADV
tSP
ADV#
tHD
tCO
tHD
tCSP
tCEM
CE#
tSP
UB#/LB#
tSP
tCBPH
tHD
tHD
WE#
tOLZ
tBOE
OE#
tHZ
tCEW
WAIT
tKHTL
HiZ
Read Burst Identified (WE#=HIGH)
Notes:
1. Non-default fixed latency BCR settings for 4-word burst READ operation: Fixed latency;
latency code two (three clocks); WAIT active LOW; WAIT asserted during delay.
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IS66WVC2M16ALL
Figure 29: READ Burst Suspend
CLK
Note2
VALID
ADDRESS
Address
tSP
tKOH
tHD
DQ0DQ15
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
tHZ
tAADV
tSP
ADV#
tHD
tCO
tCSP
tHD tCBPH
tHD
tHD
tCEM
CE#
tSP
UB#/LB#
tHD
tSP tHD
WE#
tOLZ
tBOE
OE#
Note3
tHZ
tCEW
WAIT
HiZ
tKHTL
Notes:
1. Non-default BCR settings for READ burst suspend: Fixed or variable latency; latency code
two (three clocks); WAIT active LOW; WAIT asserted during delay.
2. CLK can be stopped LOW or HIGH, but must be static, with no LOW-to-HIGH transitions
during burst suspend.
3. OE# can stay LOW during BURST SUSPEND. If OE# is LOW, DQ[15:0] will continue to
output valid data.
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IS66WVC2M16ALL
Figure 30: Burst READ at End of Row (Wrap Off)
tCLK
CLK
Address
DQ0DQ15
VALID
OUTPUT
VALID
OUTPUT
VALID
OUTPUT
End of Row (A[7:0]=FFh)
ADV#
VIH
NOTE2
CE#
UB#/LB#
VIH
tHZ
VIL
VIL
WE#
OE#
VIL
tKHTL
tHZ
WAIT
Notes:
1. Non-default BCR settings for burst WRITE at end of row: fixed or variable latency; WAIT
active LOW; WAIT asserted during delay.
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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IS66WVC2M16ALL
Figure 31: CE#-Controlled Asynchronous WRITE
tWC
Address
VALID
ADDRESS
tAW
DQ0DQ15
tWR
VALID
INPUT
tAS
tLZ
tDW
tWHZ
ADV#
tCW
CE#
tDH
tHZ
tBW
UB#/LB#
OE#
tWPH
tWP
WE#
tCEW
WAIT
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tHZ
HiZ
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HiZ
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IS66WVC2M16ALL
Figure 32: LB#/UB#-Controlled Asynchronous WRITE
tWC
Address
VALID
ADDRESS
tAW
DQ0DQ15
tWR
VALID
INPUT
tLZ
tDW
tWHZ
ADV#
tCW
CE#
tDH
tHZ
tAS
tBW
UB#/LB#
OE#
tWPH
tWP
WE#
tCEW
WAIT
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tHZ
HiZ
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HiZ
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IS66WVC2M16ALL
Figure 33: WE#-Controlled Asynchronous WRITE
tWC
Address
VALID
ADDRESS
tAW
DQ0DQ15
tWR
VALID
INPUT
tAS
tLZ
tDW
tWHZ
ADV#
tCW
CE#
tDH
tHZ
tBW
UB#/LB#
tAS
OE#
tWPH
tWP
WE#
tCEW
WAIT
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tHZ
HiZ
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HiZ
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IS66WVC2M16ALL
Figure 34: Asynchronous WRITE Using ADV#
tAW
tAS
Address
VALID
ADDRESS
tAVS
tAVH
tDW
DQ0DQ15
tDH
VALID
DATA
tVS
tVP
ADV#
tAS
tCVS
CE#
tCW
tBW
UB#/LB#
tWP
WE#
tCEW
WAIT
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tHZ
HiZ
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HiZ
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IS66WVC2M16ALL
Figure 35: Four-Word Burst WRITE Operation – Variable Latency
tCLK
CLK
VALID
ADDRESS
Address
tSP
DQ0DQ15
tSP
tHD
DATA IN
tAS
NOTE3
tHD
DATA IN
DATA IN
DATA IN
tAS
ADV#
tHD
tCSP
tCEM
CE#
tCBPH
tSP
UB#/LB#
tSP
WE#
HiZ
WAIT
tHD
tHD
tHD
tCEW
tKHTL
NOTE2
Write Burst Identified (WE#=LOW)
Notes:
1. Non-default BCR settings for burst WRITE operation, with fixed-length burst of 4, burst wrap enabled:
Variable latency; latency code two (three clocks); WAIT active LOW; WAIT asserted during delay.
2. WAIT asserts for LC cycles for both fixed and variable latency. LC = latency code (BCR[13:11]).
3. tAS required if tCSP > 20ns.
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Figure 36: Four-Word Burst WRITE Operation – Fixed Latency
tCLK
CLK
VALID
ADDRESS
Address
tSP
DQ0DQ15
tSP
tHD
DATA IN
tAS
NOTE3
tHD
DATA IN
DATA IN
DATA IN
tAVH
tAS
ADV#
tHD
tCSP
tCEM
CE#
tCBPH
tSP
UB#/LB#
tSP
WE#
tHD
tHD
tHD
tCEW
tKHTL
HiZ
WAIT
NOTE2
Write Burst Identified (WE#=LOW)
Notes:
1. Non-default BCR settings for burst WRITE operation, with fixed-length burst of 4, burst wrap enabled:
Fixed latency; latency code two (three clocks); WAIT active LOW; WAIT asserted during delay.
2. WAIT asserts for LC cycles for both fixed and variable latency. LC = latency code (BCR[13:11]).
3. tAS required if tCSP > 20ns.
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IS66WVC2M16ALL
Figure 37: Burst WRITE at End-of-Row (Wrap Off)
tCLK
CLK
Address
ADV#
VIH
UB#/LB#
WE#
OE#
VIH
tKHTL
tHZ
tHZ
WAIT
NOTE2
CE#
VIH
tHZ
VIL
DQ0DQ15
VALID
INPUT
VALID
INPUT
VALID
INPUT
End of Row (A[7:0]=FFh)
Notes:
1. Non-default BCR settings for burst WRITE at end of row: fixed or variable latency; WAIT
active LOW; WAIT asserted during delay.
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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IS66WVC2M16ALL
Figure 38: Burst WRITE followed by Burst READ
tABA
tCLK
CLK
VALID
ADDRESS
Address
tSP tHD
DQ0DQ15
VALID
ADDRESS
tSP tHD
tSP tHD
tACLK
tKOH
VALID VALID VALID VALID
OUTPUTOUTPUTOUTPUTOUTPUT
DATA IN DATA IN DATA INDATA IN
tAS
tAS
ADV#
tCBPH
tCSP
tCEM
tCEM
CE#
tSPtHD
tHD
UB#/LB#
tSP tHD
WE#
tOLZ
tBOE
OE#
WAIT
tOHZ
tCEW
HiZ
tKHTL
HiZ
tHZ
tCEW
tKHTL
Notes:
1. Non-default BCR settings for burst WRITE followed by burst READ; latency code two (three 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. CE# can stay
LOW between burst READ and burst WRITE operations, but CE# must not remain LOW longer than
tCEM. See burst interrupt diagram (Figure 39 through 44) for cases where
CE# stay LOW between bursts.
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IS66WVC2M16ALL
Figure 39: Burst READ interrupted by Burst READ
WRITE burst interrupted with new READ
CLK
VALID
ADDRESS
Address
tSP
VALID
ADDRESS
tACLK
tHD
DQ0DQ15
tACLK tKOH
tKOH
VALID
VALID
VALID
VALID
OUTPUT OUTPUT OUTPUT OUTPUT
VALID
OUTPUT
tOHZ
tSP
ADV#
tHD
tCSP
tCEM (Note3)
CE#
UB#/LB#
tSP tHD
WE#
tOLZ
WAIT
tBOE
tBOE
OE#
tCEW
tOHZ
tKHTL
tHZ
HiZ
Notes:
1. Non-default BCR settings for burst READ interrupted by burst READ : fixed or variable latency;
latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay. All bursts shown
for variable latency; no refresh collision.
2. Burst interrupt shown on first allowable clock (such as after the first data received by the controller).
3. CE# can stay LOW between burst operations, but CE# must not remain LOW longer than tCEM
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IS66WVC2M16ALL
Figure 40: Burst READ interrupted by Burst WRITE
WRITE burst interrupted with new WRITE
CLK
VALID
ADDRESS
Address
tSP
VALID
ADDRESS
tACLK
tHD
DQ0DQ15
tKOH
VALID
OUTPUT
VALID
INPUT
VALID
INPUT
VALID
INPUT
VALID
INPUT
tOHZ
ADV#
tCSP
tCEM (Note3)
tHD
CE#
UB#/LB#
tSP tHD
WE#
tBOE
OE#
WAIT
tCEW
tKHTL
HiZ
Notes:
1. Non-default BCR settings for burst READ interrupted by burst WRITE: fixed or variable latency;
latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay. All bursts shown
for variable latency; no refresh collision.
2. Burst interrupt shown on first allowable clock (such as after the first data received by the controller).
3. CE# can stay LOW between burst operations, but CE# must not remain LOW longer than tCEM
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Figure 41: Burst WRITE interrupted by Burst READ – Variable Latency Mode
WRITE burst interrupted with new READ
CLK
VALID
ADDRESS
Address
tSP
VALID
ADDRESS
tACLK tKOH
tHD
DQ0DQ15
VALID
VALID
VALID
VALID
OUTPUT OUTPUT OUTPUT OUTPUT
VALID
INPUT
tSP
ADV#
tHD
tCSP
tCEM (Note 3)
CE#
UB#/LB#
tSP tHD
WE#
tOLZ
tBOE
OE#
WAIT
tOHZ
tCEW
tKHTL
tHZ
HiZ
Notes:
1. Non-default BCR settings for burst WRITE interrupted by burst READ in variable latency mode:
fixed or variable latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
All bursts shown for variable latency; no refresh collision.
2. Burst interrupt shown on first allowable clock (such as after first data word written).
3. CE# can stay LOW between burst operations, but CE# must not remain LOW longer than tCEM.
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IS66WVC2M16ALL
Figure 42: Burst WRITE interrupted by Burst WRITE – Variable Latency Mode
WRITE burst interrupted with new WRITE
CLK
Address
VALID
ADDRESS
tSP
tHD
DQ0DQ15
ADV#
VALID
ADDRESS
VALID
INPUT
tSP
VALID
INPUT
VALID
INPUT
VALID
INPUT
VALID
INPUT
tHD
tCSP
tHD
tCEM (Note 3)
CE#
UB#/LB#
tSP tHD
WE#
OE#
tCEW
tKHTL
WAIT
Notes:
1. Non-default BCR settings for burst WRITE interrupted by WRITE: fixed or variable latency;
latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay. All bursts shown
for variable latency; no refresh collision.
2. Burst interrupt shown on first allowable clock (such as after the first data received by the controller).
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Figure 43: Burst WRITE interrupted by Burst READ – Fixed Latency Mode
WRITE burst interrupted with new READ
CLK
VALID
ADDRESS
Address
tSP
VALID
ADDRESS
tACLK tKOH
tAVH
DQ0DQ15
VALID
VALID
VALID
VALID
OUTPUT OUTPUT OUTPUT OUTPUT
VALID
INPUT
tSP
ADV#
tHD
tCSP
tCEM (Note 3)
CE#
UB#/LB#
tSP tHD
WE#
tOLZ
tBOE
OE#
WAIT
tOHZ
tCEW
tKHTL
tHZ
HiZ
Notes:
1. Non-default BCR settings for burst WRITE interrupted by burst READ in fixed latency mode:
fixed latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
2. Burst interrupt shown on first allowable clock (such as after first data word written).
3. CE# can stay LOW between burst operations, but CE# must not remain LOW longer than tCEM.
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Figure 44: Burst WRITE interrupted by Burst WRITE – Fixed Latency Mode
CLK
Address
VALID
ADDRESS
tSP
tAVH
DQ0DQ15
ADV#
VALID
ADDRESS
VALID
INPUT
tSP
VALID
INPUT
VALID
INPUT
VALID
INPUT
VALID
INPUT
tHD
tCSP
tCEM (Note 3)
tHD
CE#
UB#/LB#
tSP tHD
WE#
OE#
tCEW
tKHTL
WAIT
Notes:
1. Non-default BCR settings for burst WRITE interrupted by burst WRITE in fixed latency mode:
fixed latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
2. Burst interrupt shown on first allowable clock (such as after first data word written).
3. CE# can stay LOW between burst operations, but CE# must not remain LOW longer than tCEM.
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Figure 45: Asynchronous WRITE followed by Burst READ
tCLK
CLK
tAW
tWR
VALID
ADDRESS
VALID
ADDRESS
Address
tDS
DQ0DQ15
tSP tHD
tDH
tACLK
VALID
DATA
tKOH
VALID
OUTPUT
tVS
tSP tHD
tVP
ADV#
tCVS
NOTE2
tCBPH
tCW
CE#
tBW
UB#/LB#
tCSP
tHD
tSP
tHD
tWP
WE#
tOLZ
tBOE
OE#
tHZ
WAIT
tKHTL
HiZ
Notes:
1. Non-default BCR settings for asynchronous WRITE followed by burst READ: fixed or variable
latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
2. When transitioning between asynchronous and variable-latency burst operations, CE# must
go HIGH. CE# can stay LOW when 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.
Rev.A | June 2011
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Figure 46: Asynchronous WRITE (ADV# LOW) followed by Burst READ
tCLK
tWC
CLK
tWR
tAW
VALID
ADDRESS
Address
tAS tLZ
tWHZ
VALID
ADDRESS
tDW
DQ0DQ15
tSP tHD
tDH
VALID
DATA
tKOH
VALID
OUTPUT
tSP tHD
ADV#
NOTE2
tCBPH
tCW
CE#
tBW
UB#/LB#
WE#
tACLK
tWPH
tCSP
tHD
tSP
tHD
tWP
tOLZ
tBOE
OE#
tCEW
WAIT HiZ
tHZ
tHZ
HiZ
tKHTL
Notes:
1. Non-default BCR settings for asynchronous WRITE followed by burst READ: fixed or variable
latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
2. When transitioning between asynchronous and variable-latency burst operations, CE# must
go HIGH. CE# can stay LOW when 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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Figure 47: Burst READ Followed by Asynchronous WRITE (WE#-Controlled)
tABA
tCLK
tWC
CLK
tAW
VALID
ADDRESS
Address
tWR
VALID
ADDRESS
tACLK
tSP tHD
DQ0DQ15
tAS
tKOH
tWHZ
tDW
VALID
OUTPUT
tDH
VALID
DATA
tLZ
tSP tHD
ADV#
tCSP
CE#
tHD
tCEM
tSP
UB#/LB#
tCW
tHD
tBW
tWP
WE#
tOLZ
tBOE
OE#
tHZ
tCEW
WAIT
HiZ
tKHTL
tCEW
tHZ
HiZ
Notes:
1. Non-default BCR settings for burst READ followed by asynchronous WE#-controlled WRITE:
fixed or variable latency; latency code 2 (3 clocks); WAIT active LOW; WAIT asserted during delay.
2. When transitioning between asynchronous and variable-latency burst operations, CE# must
go HIGH. CE# can stay LOW when transitioning from 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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IS66WVC2M16ALL
Figure 48: Burst READ Followed by Asynchronous WRITE Using ADV#
tABA
tCLK
tWC
CLK
tAW
VALID
ADDRESS
Address
VALID
ADDRESS
tACLK
tSP tHD
DQ0DQ15
tAS
tKOH
tWHZ
tDW
VALID
OUTPUT
tCSP
CE#
tLZ
tHD
tCEM
tSP
UB#/LB#
tDH
VALID
DATA
tSP tHD
ADV#
tWR
tCVS
tHD
tCW
tBW
tWP
WE#
tOLZ
tBOE
OE#
tHZ
tCEW
WAIT
HiZ
tKHTL
tCEW
HiZ
tHZ
HiZ
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 transitioning between asynchronous and variable-latency burst operations, CE# must
go HIGH. CE# can stay LOW when transitioning from 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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IS66WVC2M16ALL
Figure 49: Asynchronous WRITE followed by Asynchronous READ – ADV# LOW
tWC
tAW
Address
tWR
tRC
VALID
ADDRESS
VALID
ADDRESS
tAS tLZ
tWHZ
tDW
DQ0DQ15
tDH
tAA
VALID
OUTPUT
VALID
DATA
ADV#
tCPH
tCW
CE#
tHZ
tCO
tHZ
Note1
tBHZ
tBLZ
tBA
tBW
UB#/LB#
tOLZ
tWPH
WE#
tWP
tCEW
WAIT
HiZ
tOHZ
tOE
OE#
tHZ
HiZ
tCEW
HiZ
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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IS66WVC2M16ALL
Figure 50: Asynchronous WRITE followed by Asynchronous READ
tWC
tAW
Address
tWR
tRC
VALID
ADDRESS
VALID
ADDRESS
tAS
tWHZ
tDW
DQ0DQ15
tDH
tAA
VALID
OUTPUT
VALID
DATA
tLZ
ADV#
tCVS
CE#
tCW
tHZ
tBLZ
tBHZ
tBA
tBW
UB#/LB#
tCO
tOLZ
tWPH
WE#
tCEW
WAIT
HiZ
tWP
tHZ
tOHZ
tOE
OE#
tCEW
HiZ
tHZ
HiZ
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.
Rev.A | June 2011
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IS66WVC2M16ALL
Ordering Information – VDD = 1.8V
Industrial Temperature Range: (-40oC to +85oC)
Config.
Speed
(ns)
Frequency
(MHz)
2Mx16
70
Rev.A | June 2011
Order Part No.
Package
104
IS66WVC2M16ALL-7010BLI
54-ball VFBGA
80
IS66WVC2M16ALL-7008BLI
54-ball VFBGA
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IS66WVC2M16ALL
Rev.A | June 2011
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