IS45S32400B-7TLA1 ISSI, Integrated Silicon Solution Inc, IS45S32400B-7TLA1 Datasheet - Page 44

• Manufacturer Part Number: IS45S32400B-7TLA1
• Description: IC SDRAM 128MBIT 143MHZ 86TSOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS45S32400B-7TLA1

• Format - Memory: RAM
• Memory Type: SDRAM
• Memory Size: 128M (4Mx32)
• Speed: 143MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 86-TSOPII
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IS45S32400B
44
CLOCK SUSPEND
Clock suspend mode occurs when a column access/burst
is in progress and CKE is registered LOW. In the clock
suspend mode, the internal clock is deactivated, “freezing”
the synchronous logic.
For each positive clock edge on which CKE is sampled
LOW, the next internal positive clock edge is suspended.
Any command or data present on the input pins at the time
Clock Suspend During WRITE Burst
Clock Suspend During READ Burst
COMMAND
INTERNAL
ADDRESS
CLOCK
COMMAND
INTERNAL
CKE
ADDRESS
CLK
DQ
CLOCK
CKE
CLK
DQ
READ
BANK a,
COL n
T0
NOP
T0
NOP
T1
WRITE
BANK a,
COL n
D
T1
IN
n
NOP
T2
D
OUT
T2
n
of a suspended internal clock edge is ignored; any data
present on the DQ pins remains driven; and burst counters
are not incremented, as long as the clock is suspended.
(See following examples.)
Clock suspend mode is exited by registering CKE HIGH;
the internal clock and related operation will resume on the
subsequent positive clock edge.
T3
D
Integrated Silicon Solution, Inc. — www.issi.com
T3
OUT
n+1
NOP
T4
D
NOP
IN
T4
n+1
NOP
D
T5
OUT
D
DON'T CARE
NOP
n+2
IN
T5
n+2
DON'T CARE
NOP
D
T6
OUT
n+3
11/12/09
Rev. C