EMD12164P Emlsi Inc., EMD12164P Datasheet - Page 23

• Manufacturer Part Number: EMD12164P
• Description: 512m 32m X 16 Mobile Ddr Sdram
• Manufacturer: Emlsi Inc.

Truncated READs
Data from any READ burst may be truncated with a BURST TERMINATE command. The BURST TERMINATE 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 architec-
ture).
Data from any READ burst must be completed or truncated before a subsequent WRITE command can be issued. If
truncation is necessary, the BURST TERMINATE command must be used.
A READ burst may be followed by, or truncated with, a PRECHARGE command to the same bank provided that auto
precharge was not 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 2n-prefetch architecture). Follow-
ing the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met.
Note: Part of the row precharge time is hidden during the access of the last data elements.
CL2
CL2
CL2
Command
Command
Command
Read Interrupted by a Read < Burst Length=4, CAS Latency = 2 >
Read Interrupted by a Write & Burst Stop < Burst Length=4, CAS Latency = 2 >
Read Interrupted by a Precharge < Burst Length=8, CAS Latency = 2 >
DQ’s
DQ’s
DQ’s
DQS
DQS
DQS
CK
CK
CK
CKB
CKB
CKB
READ A
READ
READ
0
0
0
1t
CK
Burst Stop
Precharge
READ B
1
1
1
Dout a0
Dout 0
Dout 0
NOP
NOP
NOP
2
2
2
Dout a1 Dout b0 Dout b1 Dout b2 Dout b3
Dout 1
Dout 1
WRITE
Dout 2 Dout 3
NOP
NOP
3
3
3
Interrupted by precharge
23
Dout 4 Dout 5 Dout 6 Dout 7
NOP
NOP
NOP
Din 0
4
4
4
Din 1
NOP
NOP
NOP
Din 2
512M: 32M x 16 Mobile DDR SDRAM
5
5
5
Din 3
NOP
NOP
NOP
6
6
6
EMD12164P
NOP
NOP
NOP
Preliminary
7
7
7
NOP
NOP
NOP
Rev 0.0
8
8
8