HYB18H512321AF
512-Mbit GDDR3
Functional Description
4.9
Precharge (PRE/PREALL)
The Precharge command is used to deactivate the
open row in a particular bank (PRE) or the open rows in
all banks (PREALL). The bank(s) will enter the idle
state and be available again for a new row access after
the time tRP. A8/AP sampled with the PRE command
determines whether one or all banks are to be
precharged. For PRE commands BA0, BA1 and BA2
select the bank. For PREALL inputs BA0, BA1 and BA2
are “Don’t Care”. The PRE/PREALL command may not
be given unless the tRAS requirement is met for the
selected bank (PRE), or for all banks (PREALL).
CLK#
CLK
CKE
CS#
RAS#
CAS#
WE#
A0-7,9-11
A8
ALL
ALL: High selects all banks
Low selects Bank BA
BA: Bank Address
/
BA0-BA2
BA
Don't Care
Figure 50 Precharge Command
Table 21
BA02, BA1 and BA0 precharge bank selection
A8 / AP
BA2
0
0
0
0
1
1
1
1
BA1
0
0
1
1
0
0
1
1
BA0
0
1
0
1
0
1
0
1
precharged bank(s)
Bank 0 only
Bank 1 only
Bank 2 only
Bank 3 only
Bank 4 only
Bank 5 only
Bank 6 only
Bank 7 only
All banks
0
0
0
0
0
0
0
0
1
X
X
X
Data Sheet
68
Rev. 1.73, 2005-08
05122004-B1L1-JEN8
QIMONDA [ QIMONDA AG ]
