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. — www.issi.com —
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Rev. 00C
09/29/03
1
IS42S32200B
GENERAL DESCRIPTION
The 64Mb SDRAM is a high speed CMOS, dynamic
random-access memory designed to operate in 3.3V
memory systems containing 67,108,864 bits. Internally
configured as a quad-bank DRAM with a synchronous
interface. Each 16,777,216-bit bank is organized as 2,048
rows by 256 columns by 32 bits.
The 64Mb SDRAM includes an AUTO REFRESH MODE,
and a power-saving, power-down mode. All signals are
registered on the positive edge of the clock signal, CLK.
All inputs and outputs are LVTTL compatible.
The 64Mb SDRAM has the ability to synchronously burst
data at a high data rate with automatic column-address
generation, the ability to interleave between internal banks
to hide precharge time and the capability to randomly
change column addresses on each clock cycle during
burst access.
A self-timed row precharge initiated at the end of the burst
sequence is available with the AUTO PRECHARGE
ISSI
®
function enabled. Precharge one bank while accessing one
of the other three banks will hide the precharge cycles and
provide seamless, high-speed, random-access operation.
SDRAM read and write accesses are burst oriented starting
at a selected location and continuing for a programmed
number of locations in a programmed sequence. The
registration of an ACTIVE command begins accesses,
followed by a READ or WRITE command. The ACTIVE
command in conjunction with address bits registered are
used to select the bank and row to be accessed (BA0, BA1
select the bank; A0-A10 select the row). The READ or
WRITE commands in conjunction with address bits reg-
istered are used to select the starting column location for
the burst access.
Programmable READ or WRITE burst lengths consist of
1, 2, 4 and 8 locations or full page, with a burst terminate
option.
FUNCTIONAL BLOCK DIAGRAM
CLK
CKE
CS
RAS
CAS
WE
DQM0-3
COMMAND
DECODER
&
CLOCK
GENERATOR
DATA IN
BUFFER
32
32
MODE
REGISTER
10
REFRESH
CONTROLLER
DQ 0-31
SELF
REFRESH
CONTROLLER
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
BA0
BA1
10
DATA OUT
BUFFER
32
32
V
DD
/V
DDQ
GND/GNDQ
REFRESH
COUNTER
2048
2048
2048
2048
ROW DECODER
MULTIPLEXER
MEMORY CELL
ARRAY
10
ROW
ADDRESS
LATCH
10
ROW
ADDRESS
BUFFER
BANK 0
SENSE AMP I/O GATE
COLUMN
ADDRESS LATCH
256
(x 32)
BANK CONTROL LOGIC
BURST COUNTER
COLUMN DECODER
COLUMN
ADDRESS BUFFER
2
Integrated Silicon Solution, Inc. — www.issi.com —
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Rev. 00C
09/29/03
IS42S32200B
PIN FUNCTIONS
Symbol
A0-A10
Pin No.
25 to 27
60 to 66
24
Type
Input Pin
Function (In Detail)
ISSI
Address Inputs: A0-A10 are sampled during the ACTIVE
command (row-address A0-A10) and READ/WRITE command (A0-A7
with A10 defining auto precharge) to select one location out of the memory array
in the respective bank. A10 is sampled during a PRECHARGE command to
determine if all banks are to be precharged (A10 HIGH) or bank selected by
BA0, BA1 (LOW). The address inputs also provide the op-code during a LOAD
MODE REGISTER command.
Bank Select Address: BA0 and BA1 defines which bank the ACTIVE, READ,
WRITE or PRECHARGE command is being applied.
CAS,
in conjunction with the
RAS
and
WE,
forms the device command. See the
"Command Truth Table" for details on device commands.
®
BA0, BA1
CAS
CKE
22,23
18
67
Input Pin
Input Pin
Input Pin
The CKE input determines whether the CLK input is enabled. The next rising edge
of the CLK signal will be valid when is CKE HIGH and invalid when LOW. When
CKE is LOW, the device will be in either power-down mode, clock suspend mode,
or self refresh mode. CKE is an asynchronous input.
CLK is the master clock input for this device. Except for CKE, all inputs to this
device are acquired in synchronization with the rising edge of this pin.
The
CS
input determines whether command input is enabled within the device.
Command input is enabled when
CS
is LOW, and disabled with
CS
is HIGH. The
device remains in the previous state when
CS
is HIGH.
DQ0 to DQ15 are DQ pins. DQ through these pins can be controlled in byte units
using the DQM0-DQM3 pins
CLK
CS
68
20
Input Pin
Input Pin
DQ0 to 2, 4, 5, 7, 8, 10,11,13
DQ31 74,76,77,79,80,82,83,85
45,47,48,50,51,53,54,56
31,33,34,36,37,39,40,42
DQM0
DQM3
16,28,59,71
DQ Pin
Input Pin
DQMx control thel ower and upper bytes of the DQ buffers. In read mode,
the output buffers are place in a High-Z state. During a WRITE cycle the input data is
masked. When DQMx is sampled HIGH and is an input mask signal for write accesses
and an output enable signal for read accesses. DQ0 through DQ7 are controlled by
DQM0. DQ8 throughDQ15 are controlled by DQM1. DQ16 through DQ23 are
controlled by DQM2. DQ24 through DQ31 are controlled by DQM3.
RAS,
in conjunction with
CAS
and
WE,
forms the device command. See the "Command
Truth Table" item for details on device commands.
WE,
in conjunction with
RAS
and
CAS,
forms the device command. See the "Command
Truth Table" item for details on device commands.
V
DDQ
is the output buffer power supply.
V
DD
is the device internal power supply.
GND
Q
is the output buffer ground.
GND is the device internal ground.
RAS
WE
V
DDQ
V
DD
GND
Q
GND
19
17
3,9,35,41,49,55,25,81
1,15,29,43
6,12,32,38,46,52,78,84
44,58,72,86
Input Pin
Input Pin
Supply Pin
Supply Pin
Supply Pin
Supply Pin
Integrated Silicon Solution, Inc. — www.issi.com —
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Rev. 00C
09/29/03
3
IS42S32200B
FUNCTION
(In Detail)
A0-A10 are address inputs sampled during the ACTIVE
(row-address A0-A10) and READ/WRITE command (A0-A7
with A10 defining auto PRECHARGE). A10 is sampled during
a PRECHARGE command to determine if all banks are to
be PRECHARGED (A10 HIGH) or bank selected by BA0,
BA1 (LOW). The address inputs also provide the op-code
during a LOAD MODE REGISTER command.
Bank Select Address (BA0 and BA1) defines which bank the
ACTIVE, READ, WRITE or PRECHARGE command is
being applied.
CAS,
in conjunction with the
RAS
and
WE,
forms the
device command. See the “Command Truth Table” for
details on device commands.
The CKE input determines whether the CLK input is
enabled. The next rising edge of the CLK signal will be
valid when is CKE HIGH and invalid when LOW. When
CKE is LOW, the device will be in either power-down
mode, CLOCK SUSPEND mode, or SELF-REFRESH
mode. CKE is an asynchronous input.
CLK is the master clock input for this device. Except for
CKE, all inputs to this device are acquired in synchroni-
zation with the rising edge of this pin.
The CS input determines whether command input is
enabled within the device. Command input is enabled
when CS is LOW, and disabled with CS is HIGH. The
device remains in the previous state when CS is HIGH. DQ0
through DQ7 are controlled by DQM0. DQ8 through DQ15
are controlled by DQM1. DQ16 through DQ23 are controlled
by DQM2. DQ24 through DQ31 are controlled by DQM3. In
read mode, DQMx control the output buffer. When DQMx is
LOW, the corresponding buffer byte is enabled, and when
HIGH, disabled. The outputs go to the HIGH Impedance
State when DQMx is HIGH. This function corresponds to
OE in conventional DRAMs. In write mode, DQMx control
the input buffer. When DQMx is LOW, the corresponding
buffer byte is enabled, and data can be written to the device.
When DQMx is HIGH, input data is masked and cannot be
written to the device.
RAS,
in conjunction with
CAS
and
WE
, forms the device
command. See the “Command Truth Table” item for
details on device commands.
WE
, in conjunction with
RAS
and
CAS
, forms the device
command. See the “Command Truth Table” item for
details on device commands.
V
DDQ
is the output buffer power supply.
V
DD
is the device internal power supply.
GND
Q
is the output buffer ground.
GND is the device internal ground.
ISSI
READ
®
The READ command selects the bank from BA0, BA1
inputs and starts a burst read access to an active row.
Inputs A0-A7 provides the starting column location. When
A10 is HIGH, this command functions as an AUTO
PRECHARGE command. When the auto precharge is
selected, the row being accessed will be precharged at
the end of the READ burst. The row will remain open for
subsequent accesses when AUTO PRECHARGE is not
selected. DQ’s read data is subject to the logic level on
the DQM inputs two clocks earlier. When a given DQM
signal was registered HIGH, the corresponding DQ’s will
be High-Z two clocks later. DQ’s will provide valid data
when the DQM signal was registered LOW.
WRITE
A burst write access to an active row is initiated with the
WRITE command. BA0, BA1 inputs selects the bank, and
the starting column location is provided by inputs A0-A7.
Whether or not AUTO-PRECHARGE is used is deter-
mined by A10.
The row being accessed will be precharged at the end of
the WRITE burst, if AUTO PRECHARGE is selected. If
AUTO PRECHARGE is not selected, the row will remain
open for subsequent accesses.
A memory array is written with corresponding input data
on DQ’s and DQM input logic level appearing at the same
time. Data will be written to memory when DQM signal is
LOW. When DQM is HIGH, the corresponding data inputs
will be ignored, and a WRITE will not be executed to that
byte/column location.
PRECHARGE
The PRECHARGE command is used to deactivate the
open row in a particular bank or the open row in all banks.
BA0, BA1 can be used to select which bank is precharged
or they are treated as “Don’t Care”. A10 determined
whether one or all banks are precharged. After executing
this command, the next command for the selected banks(s)
is executed after passage of the period t
RP
, which is the
period required for bank precharging. Once a bank has
been precharged, it is in the idle state and must be
activated prior to any READ or WRITE commands being
issued to that bank.
AUTO PRECHARGE
The AUTO PRECHARGE function ensures that the
precharge is initiated at the earliest valid stage within a
burst. This function allows for individual-bank precharge
without requiring an explicit command. A10 to enables the
AUTO PRECHARGE function in conjunction with a spe-
cific READ or WRITE command. For each individual
READ or WRITE command, auto precharge is either
4
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
Rev. 00C
09/29/03
IS42S32200B
enabled or disabled. AUTO PRECHARGE does not apply
except in full-page burst mode. Upon completion of the
READ or WRITE burst, a precharge of the bank/row that
is addressed is automatically performed.
ISSI
BURST TERMINATE
®
AUTO REFRESH COMMAND
This command executes the AUTO REFRESH operation.
The row address and bank to be refreshed are automatically
generated during this operation. The stipulated period (t
RC
)
is required for a single refresh operation, and no other
commands can be executed during this period. This com-
mand is executed at least 4096 times every 64ms. During
an AUTO REFRESH command, address bits are “Don’t
Care”. This command corresponds to CBR Auto-refresh.
The BURST TERMINATE command forcibly terminates
the burst read and write operations by truncating either
fixed-length or full-page bursts and the most recently
registered READ or WRITE command prior to the BURST
TERMINATE.
COMMAND INHIBIT
COMMAND INHIBIT prevents new commands from being
executed. Operations in progress are not affected, apart
from whether the CLK signal is enabled
NO OPERATION
When
CS
is low, the NOP command prevents unwanted
commands from being registered during idle or wait
states.
SELF REFRESH
During the SELF REFRESH operation, the row address to
be refreshed, the bank, and the refresh interval are
generated automatically internally. SELF REFRESH can
be used to retain data in the SDRAM without external
clocking, even if the rest of the system is powered down.
The SELF REFRESH operation is started by dropping the
CKE pin from HIGH to LOW. During the SELF REFRESH
operation all other inputs to the SDRAM become “Don’t
Care”.The device must remain in self refresh mode for a
minimum period equal to t
RAS
or may remain in self refresh
mode for an indefinite period beyond that.The SELF-
REFRESH operation continues as long as the CKE pin
remains LOW and there is no need for external control of
any other pins.The next command cannot be executed
until the device internal recovery period (t
RC
) has elapsed.
Once CKE goes HIGH, the NOP command must be
issued (minimum of two clocks) to provide time for the
completion of any internal refresh in progress. After the
self-refresh, since it is impossible to determine the ad-
dress of the last row to be refreshed, an AUTO-REFRESH
should immediately be performed for all addresses.
LOAD MODE REGISTER
During the LOAD MODE REGSITER command the mode
register is loaded from A0-A10. This command can only
be issued when all banks are idle.
ACTIVE COMMAND
When the ACTIVE COMMAND is activated, BA0, BA1
inputs selects a bank to be accessed, and the address
inputs on A0-A10 selects the row. Until a PRECHARGE
command is issued to the bank, the row remains open for
accesses.
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