hyb18m1g16 Qimonda, hyb18m1g16 Datasheet - Page 41

• Manufacturer Part Number: hyb18m1g16
• Description: Drams For Mobile Applications 1-gbit X16 Ddr Mobile-ram Rohs Compliant
• Manufacturer: Qimonda

2.4.8
The PRECHARGE command is used to deactivate (close) the
open row in a particular bank or the open rows in all banks.
The bank(s) will be available for a subsequent row access a
specified time (
issued. Input A10 determines whether one or all banks are to
be precharged, and in the case where only one bank is to be
precharged, inputs BA0, BA1 select the bank. Otherwise
BA0, BA1 are treated as “Don’t Care.”
Once a bank has been precharged, it is in the idle state and
must be activated prior to any READ or WRITE commands
being issued to that bank. A PRECHARGE command will be
treated as a NOP if there is no open row in that bank, or if the
previously open row is already in the process of precharging.
1) These parameters account for the number of clock cycles and depend on the operating frequency, as follows:
Rev.1.0, 2007-03
10242006-Y557-TZXW
Parameter
ACTIVE to PRECHARGE command period
PRECHARGE command period
WRITE recovery time
no. of clock cycles = specified delay / clock period; round to the next higher integer.
t
RP
) after the PRECHARGE command is
PRECHARGE
41
t
t
t
Symbol
RAS
RP
WR
Timing Parameters for PRECHARGE Command
42
18
15
min.
BA0,BA1
A11,A12
A0-A9
BA = Bank Address
(if A10 = L, otherwise Don't Care)
- 6
CKE
RAS
CAS
A10
70,000
–
–
WE
CK
CK
CS
max.
(High)
= Don't Care
45
22.5
15
One Bank
min.
All Banks
BA
PRECHARGE Command
- 7.5
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
70,000
–
–
max.
FIGURE 32
TABLE 13
Unit
ns
ns
ns
Data Sheet
Note
1)
1)
1)