mt48lc1m16a1 Micron Semiconductor Products, mt48lc1m16a1 Datasheet - Page 26

• Manufacturer Part Number: mt48lc1m16a1
• Description: Synchronous Dram
• Manufacturer: Micron Semiconductor Products

TRUTH TABLE 3 – CURRENT STATE BANK n - COMMAND TO BANK n
(Notes: 1-6; notes appear below and on next page)
NOTE: 1. This table applies when CKE
16Mb: x16 IT SDRAM
16MSDRAMx16IT.p65 – Rev. 5/99
CURRENT STATE CS# RAS# CAS# WE#
Row Active
Precharge
Precharge
Disabled)
Disabled)
(Auto
(Auto
Write
Read
Any
Idle
2. This table is bank-specific, except where noted; i.e., the current state is for a specific bank and the commands shown
3. Current state definitions:
4. The following states must not be interrupted by a command issued to the same bank. COMMAND INHIBIT or NOP
met (if the previous state was self refresh).
are those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
commands, or allowable commands to the other bank, should be issued on any clock edge occuring during these states.
Allowable commands to the other bank are determined by its current state and Truth Table 3, and according to Truth
Table 4.
Precharge Enabled: Starts with registration of a READ command with AUTO PRECHARGE enabled and ends when
Precharge Enabled: Starts with registration of a WRITE command with AUTO PRECHARGE enabled and ends when
Row Activating: Starts with registration of an ACTIVE command and ends when
Write w/Auto
Precharging: Starts with registration of a PRECHARGE command and ends when
Read w/Auto
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
Row Active: A row in the bank has been activated and
Write: A WRITE burst has been initiated, with AUTO PRECHARGE disabled, and has not yet terminated
H
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
Read: A READ burst has been initiated, with AUTO PRECHARGE disabled, and has not yet terminated
Idle: The bank has been precharged and
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
register accesses are in progress.
or been terminated.
or been terminated.
the bank will be in the idle state.
the bank will be in the row active state.
has been met. Once
t
RP has been met. Once
n-1
was HIGH and CKE
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
L
L
WRITE (Select column and start WRITE burst)
READ (Select column and start READ burst)
COMMAND (ACTION)
COMMAND INHIBIT (NOP/Continue previous operation)
NO OPERATION (NOP/Continue previous operation)
ACTIVE (Select and activate row)
AUTO REFRESH
LOAD MODE REGISTER
PRECHARGE
READ (Select column and start READ burst)
PRECHARGE (Deactivate row in bank or banks)
READ (Select column and start new READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE (Truncate READ burst, start PRECHARGE)
BURST TERMINATE
WRITE (Select column and start new WRITE burst)
PRECHARGE (Truncate WRITE burst, start PRECHARGE)
BURST TERMINATE
t
RP is met, the bank will be in the idle state.
n
t
is HIGH (see Truth Table 2) and after
RP is met, the bank will be in the idle state.
26
t
RP has been met.
t
RCD has been met. No data bursts/accesses and no
Micron Technology, Inc., reserves the right to change products or specifications without notice.
t
XSR has been
t
RCD is met. Once
t
RP is met. Once
16Mb: x16
IT SDRAM
©1999, Micron Technology, Inc.
t
RCD is met,
t
RP is met,
NOTES
11
10
10
10
10
10
10
7
7
8
8
9
8
9
t
RP