is43lr32200b-6bl Integrated Silicon Solution, Inc., is43lr32200b-6bl Datasheet - Page 29

• Manufacturer Part Number: is43lr32200b-6bl
• Description: 512k X 32bits X 4banks Mobile Ddr Sdram
• Manufacturer: Integrated Silicon Solution, Inc.

Rev. 00A | Feb. 2011
Figure16 : Random Read access
Truncated Reads
latency is equal to the READ (CAS) latency, i.e., the BURST TERMINATE command should be issued x cycles after the READ command,
where x equals the number of desired data element pairs (pairs are required by the 2n-prefetch architecture).
necessary, the BURST TERMINATE command must be used.
activated. The PRECHARGE command should be issued x cycles after the READ command, where x equals the number of desired data
element pairs (pairs are required by the n-prefetch architecture). This is shown in Figure (READ to PRECHARGE). Following the
PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met.
Figure17 : Read Burst terminate (BL=4,8 or 16)
Data from any READ burst may be truncated with a BURST TERMINATE command, as shown in Figure16. The BURST TERMINATE
Data from any READ burst must be completed or truncated before a subsequent WRITE command can be issued. If truncation is
A READ burst may be followed by, or truncated with, a PRECHARGE command to the same bank provided that auto precharge was not
Notes:
Notes:
Command
Address
1. Dout n or m,p,q = Data-Out from Column n or m,p,q
2. BL=2,4,8,16 (if 4,8 or 16, the following burst interrupts the previous)
3. Reads are to an Active row in any bank.
4. Shown with nominal tAC, tDQSCK and tDQSQ
1. Dout n = Data-Out from Column n
2. CKE=high
3. Shown with nominal tAC, tDQSCK and tDQSQ
/CLK
CLK
DQS
DQ
Command
Address
/CLK
CLK
DQS
DQ
Bank a
READ
COL n
T0
Don ’ t care
Bank a
READ
COL n
T0
Bank a
COL m
READ
T1
Don ’ t care
CL=3
BST
T1
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CL= 3
Bank a
READ
COL p
T2
NOP
T2
D
Bank a
READ
COL q
OUT
n
T3
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D
n+1
D OUT
OUT
NOP
n
T3
D OUT
D
n+ 1
OUT
m
NOP
T4
D
m+1
NOP
OUT
T4
D
OUT
p
NOP
T5
D
p+1
OUT
D
OUT
q
NOP
IS43/46LR32200B
Advanced Information
D
q+1
OUT
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