IS45S32400B-7BA1-TR ISSI, Integrated Silicon Solution Inc, IS45S32400B-7BA1-TR Datasheet - Page 49

• Manufacturer Part Number: IS45S32400B-7BA1-TR
• Manufacturer: ISSI, Integrated Silicon Solution Inc
• Type: SDRAMr

Specifications of IS45S32400B-7BA1-TR

• Organization: 4Mx32
• Density: 128Mb
• Address Bus: 14b
• Access Time (max): 6.5/5.4ns
• Maximum Clock Rate: 143MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Supply Current: 130mA
• Pin Count: 90
• Mounting: Surface Mount
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

WRITE With Auto Precharge interrupted by a WRITE
IS45S32400B
WRITE With Auto Precharge interrupted by a READ
Integrated Silicon Solution, Inc. — www.issi.com
Rev. C
11/12/09
WRITE with Auto Precharge
3. Interrupted by a READ (with or without auto precharge):
A READ to bank m will interrupt a WRITE on bank n when
registered, with the data-out appearing (CAS latency)
later. The PRECHARGE to bank n will begin after t
is met, where t
registered.The last valid WRITE to bank n will be data-in
registered one clock prior to the READ to bank m.
Internal States
Internal States
COMMAND
COMMAND
ADDRESS
ADDRESS
BANK m
BANK m
BANK n
BANK n
CLK
CLK
DQ
DQ
dpl
begins when the READ to bank m is
Page Active
Page Active
T0
T0
NOP
NOP
WRITE - AP
WRITE - AP
BANK n,
BANK n,
BANK n
BANK n
T1
T1
COL a
COL a
D
D
Page Active
IN
IN
WRITE with Burst of 4
a
a
Page Active
WRITE with Burst of 4
T2
D
T2
D
NOP
NOP
IN
IN
a+1
a+1
dpl
READ - AP
BANK m,
BANK m
T3
T3
NOP
D
COL b
IN
Interrupt Burst, Write-Back
a+2
4.Interrupted by a WRITE (with or without auto precharge):
t
CAS Latency - 3 (BANK m)
DPL
AWRITE to bank m will interrupt a WRITE on bank n when
registered.The PRECHARGE to bank n will begin after
t
m is registered. The last valid data WRITE to bank n
will be data registered one clock prior to a WRITE to
bank m.
dpl
- BANK n
WRITE - AP
BANK m,
BANK m
T4
T4
NOP
COL b
D
is met, where t
Interrupt Burst, Write-Back
IN
READ with Burst of 4
b
t
DPL
WRITE with Burst of 4
- BANK n
T5
T5
D
NOP
NOP
IN
b+1
dpl
begins when the WRITE to bank
T6
T6
D
NOP
NOP
IN
D
Precharge
t
OUT
b+2
RP - BANK n
b
t
Precharge
RP - BANK n
DON'T CARE
DON'T CARE
T7
T7
D
NOP
NOP
D
Write-Back
IN
Precharge
OUT
b+3
t
t
RP - BANK m
DPL - BANK m
b+1
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