HYB18L128160BF Datasheet, PDF (44/53 Pages) Infineon Technologies AG – DRAMs for Mobile Applications

HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional Description
Table 14 Current State Bank n - Command to Bank n (cont’d)
Current State
Write
(Auto-
Precharge
Disabled)
CS RAS CAS WE Command / Action
L H L H READ (select column and start READ burst)
L H L L WRITE (select column and start WRITE burst)
L L H L PRECHARGE (truncate WRITE burst, start precharge)
L H H L BURST TERMINATE
Notes
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
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:
The bank has been precharged, and t_RP has been met.
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 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
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.
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 is met, the
SDRAM is in the “all banks idle” state.
Accessing Mode
Register:
Starts with registration of a MODE REGISTER SET command and ends when t_MRD has been met. 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.
10) May or may not be bank-specific; if multiple banks are to be precharged, each must be in a valid state for precharging.
11) Not bank-specific; BURST TERMINATE affects the most recent READ or WRITE burst, regardless of bank.
Table 15 Current State Bank n - Command to Bank m (different bank)
Current State CS RAS CAS WE Command / Action
Any
H X X X DESELECT (NOP / continue previous operation)
L H H H NO OPERATION (NOP / continue previous operation)
Notes
1)2)3)4)5)6)
1) to 6)
Data Sheet
44
V1.4, 2004-04-30