HYB18L256169BF Datasheet, PDF (37/48 Pages) Qimonda AG – 256-Mbit Mobile-RAM

HY[B/E]18L256169BF-7.5
256-Mbit Mobile-RAM
Functional Description
2.5
Function Truth Tables
Table 14 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) to 6)}
Idle
L L H H ACTIVE (select and activate row)
1) to 6)
L L L H AUTO REFRESH
1) to 7)
L L L L MODE REGISTER SET
1) to 7)
L L H L PRECHARGE
1) to 6), 8)
Row Active
L H L H READ (select column and start READ burst)
1) to 6), 9)
L H L L WRITE (select column and start WRITE burst)
1) to 6), 9)
L L H L PRECHARGE (deactivate row in bank or banks)
1) to 6), 10)
Read
L H L H READ (select column and start new READ burst)
1) to 6), 9)
(Auto-
Precharge
Disabled)
L H L L WRITE (select column and start new WRITE burst)
1) to 6), 9)
L L H L PRECHARGE (truncate READ burst, start precharge) ^{1) to 6), 10)}
L H H L BURST TERMINATE
1) to 6), 11)
Write
L H L H READ (select column and start READ burst)
1) to 6), 9)
(Auto-
L H L L WRITE (select column and start WRITE burst)
1) to 6), 9)
Precharge
Disabled)
L L H L PRECHARGE (truncate WRITE burst, start precharge) ^{1) to 6), 10)}
L H H L BURST TERMINATE
1) to 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:
Row Active:
AThreowbainnkthheabsabnekehnapsrebceheanrgaecdti,vaatnedd,^tRa^Pnhdat^s_RC^b_D^{eehnasmbeete.} n 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 15.
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:
Write 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.
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.
Data Sheet
37
Rev. 1.02, 2006-12
02032006-MP0M-7FQG