Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

TMS626812B Datasheet(PDF) 3 Page - Texas Instruments

Part No. TMS626812B
Description  1,048,576 BY 8-BIT BY 2-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORIES
Download  40 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS626812B Datasheet(HTML) 3 Page - Texas Instruments

  TMS626812B Datasheet HTML 1Page - Texas Instruments TMS626812B Datasheet HTML 2Page - Texas Instruments TMS626812B Datasheet HTML 3Page - Texas Instruments TMS626812B Datasheet HTML 4Page - Texas Instruments TMS626812B Datasheet HTML 5Page - Texas Instruments TMS626812B Datasheet HTML 6Page - Texas Instruments TMS626812B Datasheet HTML 7Page - Texas Instruments TMS626812B Datasheet HTML 8Page - Texas Instruments TMS626812B Datasheet HTML 9Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 3 / 40 page
background image
TMS626812B
1 048 576 BY 8-BIT BY 2-BANK
SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORIES
SMOS693A – OCTOBER 1997 – REVISED APRIL 1998
3
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
operation (continued)
Additionally, operations can be controlled by three methods: using chip select (CS) to select / deselect the
devices, using DQM to enable / mask the DQ signals on a cycle-by-cycle basis, or using CKE to suspend the
CLK input. The device contains a mode register that must be programmed for proper operation.
Table 1, Table 2, and Table 3 show the various operations that are available on the ’626812B. These function
tables identify the command and / or operations and their respective mnemonics. Each table is followed by a
legend that explains the abbreviated symbols. An access operation refers to any read or write command in
progress at cycle n. Access operations include the cycle upon which the read or write command is entered and
all subsequent cycles through the completion of the access burst.
Table 1. Basic Command Function Table
COMMAND‡
STATE OF
BANK(S)
CS
RAS
CAS
W
A11
A10
A0 – A9
MNEMONIC
Mode register set
T = deac
B = deac
L
L
L
L
X
X
A0 – A6 = V
A7 – A8 = 0
A9 = V
MRS
Bank deactivate (precharge)
X
L
L
H
L
BS
L
X
DEAC
Deactivate all banks
X
L
L
H
L
X
H
X
DCAB
Bank activate / row-address entry
SB = deac
L
L
H
H
BS
V
V
ACTV
Column-address entry / write operation
SB = actv
L
H
L
L
BS
L
V
WRT
Column-address entry / write operation
with automatic deactivate
SB = actv
L
H
L
L
BS
H
V
WRT-P
Column-address entry / read operation
SB = actv
L
H
L
H
BS
L
V
READ
Column-address entry / read operation
with automatic deactivate
SB = actv
L
H
L
H
BS
H
V
READ-P
No operation
X
L
H
H
H
X
X
X
NOOP
Control-input inhibit / no operation
X
H
X
X
X
X
X
X
DESL
Auto-refresh§
T = deac
B = deac
L
L
L
H
X
X
X
REFR
† For exception of these commands on cycle n, one of the following must be true:
– CKE(n–1) must be high.
– tCESP must be satisfied for power-down exit.
– tCESP and tRC must be satisfied for self-refresh exit.
– tIS and nCLE must be satisfied for clock-suspend exit.
DQM(n) is a don’t care.
‡ All other unlisted commands are considered vendor-reserved commands or illegal commands.
§ Auto-refresh or self-refresh entry requires that all banks be deactivated or be in an idle state prior to the command entry.
Legend:
n
= CLK cycle number
L
= Logic low
H
= Logic high
X
= Don’t care, either logic low or logic high
V
= Valid
T
= Bank T
B
= Bank B
actv
= Activated
deac = Deactivated
BS
= Logic high to select bank T; logic low to select bank B
SB
= Bank selected by A11 at cycle n


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn