Internet Data Sheet
HYB25D512[40/16/80]0B[E/F/C/T](L)
Double-Data-Rate SDRAM
9) Concurrent Auto Precharge:
This device supports “Concurrent Auto Precharge”. When a read with auto precharge or a write with auto precharge is enabled any
command may follow to the other banks as long as that command does not interrupt the read or write data transfer and all other limitations
apply (e.g. contention between READ data and WRITE data must be avoided). The minimum delay from a read or write command with
auto precharge enable, to a command to a different banks is summarized in Table 15.
10) A Write command may be applied after the completion of data output.
TABLE 15
Truth Table 5: Concurrent Auto Precharge
From Command
To Command (different bank)
Minimum Delay with Concurrent Auto Unit
Precharge Support
1)
WRITE w/AP
Read or Read w/AP
Write to Write w/AP
Precharge or Activate
Read or Read w/AP
Write or Write w/AP
Precharge or Activate
1 + (BL/2) + RU(tWTR/tCK
)
tCK
tCK
tCK
tCK
tCK
tCK
BL/2
1
Read w/AP
BL/2
RU(CL)1) + BL/2
1
1) RU means rounded to the next integer
Rev. 1.63, 2006-09
22
03062006-PFFJ-YJY2
QIMONDA [ QIMONDA AG ]
