IS42S32800B-7BL INTEGRATED SILICON SOLUTION (ISSI), IS42S32800B-7BL Datasheet - Page 14

• Manufacturer Part Number: IS42S32800B-7BL
• Description: IC, SDRAM, 256MBIT, 143MHZ, BGA-90
• Manufacturer: INTEGRATED SILICON SOLUTION (ISSI)

Specifications of IS42S32800B-7BL

• Memory Type: DRAM - Sychronous
• Access Time: 7ns
• Page Size: 256Mbit
• Ic Interface Type: Parallel
• Memory Case Style: BGA
• No. Of Pins: 90
• Operating Temperature Range: 0°C To +70°C
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IS42S32800B
14
· Interrupted by a WRITE (with or without auto precharge): A WRITE to bank m will interrupt a WRITE on bank
WRITE with Auto Precharge
· Interrupted by a READ (with or without auto precharge): A READ to bank m will interrupt a WRITE on bank n
n when registered. The PRECHARGE to bank n will begin after t WR is met, where t WR begins when the WRITE
to bank m is registered. The last valid data WRITE to bank n will be data registered one clock prior to a WRITE
to bank m.
when registered, with the data-out ap- pearing CAS latency later. The PRECHARGE to bank n will begin after
t WR is met, where t WR begins when the READ to bank m is 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
NOTE: 1. DQM is LOW.
NOTE: 1. DQM is LOW.
WRITE With Auto Precharge Interrupted by a WRITE
WRITE With Auto Precharge Interrupted by a READ
COMMAND
ADDRESS
BANK m
COMMAND
BANK n
ADDRESS
BANK m
BANK n
CLK
DQ
Page Active
NOP
T0
Page Active
T0
NOP
WRITE - AP
BANK n,
Page Active
BANK n
COL a
T1
D
a
WRITE - AP
IN
BANK n,
WRITE with Burst of 4
Page Active
BANK n
COL a
T1
D
a
IN
WRITE with Burst of 4
a + 1
T2
D
NOP
IN
a + 1
T2
D
NOP
IN
a + 2
T3
D
IN
BANK m,
READ - AP
T3
COL d
BANK m
Interrupt Burst, Write-Back
t
CAS Latency = 3 (BANK m)
WR - BANK n
READ with Burst of 4
BANK m,
WRITE - AP
COL d
BANK m
T4
D
Interrupt Burst, Write-Back
d
t
IN
WR - BANK n
T4
WRITE with Burst of 4
NOP
T5
d + 1
NOP
D
T5
IN
NOP
Precharge
t
RP - BANK n
T6
d + 2
NOP
Precharge
D
t RP - BANK n
IN
T6
D
NOP
OUT
d
DON’T CARE
Integrated Silicon Solution, Inc.
DON’T CARE
T7
d + 3
NOP
D
t WR - BANK m
IN
Write-Back
T7
D
d + 1
NOP
t RP - BANK m
OUT
I
®
07/21/09
Rev. F