Internet Data Sheet
HY[B/I]25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit 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
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) + tWTR
tCK
tCK
tCK
tCK
tCK
tCK
BL/2
1
Read w/AP
BL/2
CL (rounded up) + BL/2
1
Rev. 2.3, 2007-03
21
03062006-8CCM-VPUW
QIMONDA [ QIMONDA AG ]
