HYB18L512320BF-7.5 Datasheet, PDF (10/23 Pages) Qimonda AG – DRAMs for Mobile Applications 512-Mbit SDR Mobile-RAM

Internet Data Sheet
2.3
Function Truth Tables
HY[B/E]18L512320BF-7.5
512-Mbit Mobile-RAM
TABLE 7
Current State Bank n - Command to Bank n
Current State CS RAS CAS WE Command / Action
Notes
Any
H X X X DESELECT (NOP / continue previous operation)
1)2)3)4)5)6)
L H H H NO OPERATION (NOP / continue previous operation)
1)2)3)4)5)6)
Idle
L L H H ACTIVE (select and activate row)
1)2)3)4)5)6)
L L L H AUTO REFRESH
1)2)3)4)5)6)7)
L
L
L
L
MODE REGISTER SET
1)2)3)4)5)6)7)
L
L
H
L
PRECHARGE
1)2)3)4)5)6)8)
Row Active
L
H
L
H
READ (select column and start READ burst)
1)2)3)4)5)6)9)
L
H
L
L
WRITE (select column and start WRITE burst)
1)2)3)4)5)6)9)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
1)2)3)4)5)6)10)
Read (Auto-
L
HL
H READ (select column and start new READ burst)
Precharge
Disabled)
L
H
L
L
WRITE (select column and start new WRITE burst)
L
L
H
L
PRECHARGE (truncate READ burst, start precharge)
1)2)3)4)5)6)9)
1)2)3)4)5)6)9)
1)2)3)4)5)6)10)
L
H
H
L
BURST TERMINATE
1)2)3)4)5)6)11)
Write (Auto-
L
HL
H READ (select column and start READ burst)
Precharge
Disabled)
L
H
L
L
WRITE (select column and start WRITE burst)
L
L
H
L
PRECHARGE (truncate WRITE burst, start precharge)
1)2)3)4)5)6)9)
1)2)3)4)5)6)9)
1)2)3)4)5)6)10)
L
H
H
L
BURST TERMINATE
1)2)3)4)5)6)11)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after t_RC has been met (if the previous state was self refresh).
2) This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are those allowed
to be issued to that bank when in that state. Exceptions are covered in the notes below.
3) Current state definitions:Idle:The bank has been precharged, and t_RP has been met.Row Active:A row in the bank has been activated, and
t_RCD has been met. No data bursts/accesses and no register accesses are in progress.Read:A READ burst has been initiated, with Auto
Precharge disabled, and has not yet terminated or been terminated.Write:A WRITE burst has been initiated, with Auto Precharge
disabled, and has not yet terminated or been terminated.
4) The following states must not be interrupted by a command issued to the same bank. DESELECT or NOP commands, or allowable
commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other bank
are determined by its current state and according to Table 8.Precharging:Starts with registration of a PRECHARGE command and ends
when t_RP is met. Once t_RP is met, the bank is in the “idle” state.Row Activating:Starts with registration of an ACTIVE command and ends
when t_RCD is met. Once t_RCD is met, the bank is in the “row active” state.Read with AP Enabled:Starts with registration of a READ
command with Auto Precharge enabled and ends when t_RP has been met. Once t_RP is met, the bank is in the idle state.Write with AP
Enabled:Starts with registration of a WRITE command with Auto Precharge enabled and ends when t_RP has been met. Once t_RP is met,
the bank is in the idle state.
5) The following states must not be interrupted by any executable command; DESELECT or NOP commands must be applied on each
positive clock edge during these states. Refreshing:Starts with registration of an AUTO REFRESH command and ends when t_RC is met.
Once t_RC ismet, the SDRAM is in the “all banks idle” state.Accessing MR:Starts with registration of a MODE REGISTER SET command
and ends when t_MRD has beenmet. Once t_MRD is met, the SDRAM is in the “all banks idle” state.Precharging All:Starts with registration of
a PRECHARGE ALL command and ends when t_RP is met. Once t_RP is met, all banks are in the idle state.
6) All states and sequences not shown are illegal or reserved.
7) Not bank-specific; requires that all banks are idle and no bursts are in progress.
8) Same as NOP command in that state.
9) READs or WRITEs listed in the Command/Action column include READs or WRITEs with Auto Precharge enabled and READs or WRITEs
with Auto Precharge disabled.
Rev.1.22, 2007-08
10
03292006-D7GM-ZBSS