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| 型號： | FW82439TX |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 18/102頁 |
| 文件大?。?/td> | 759K |
| 代理商： | FW82439TX |
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Extended Temperature 82439TX (MTXC) Datasheet
18
PRELIMINARY
2.5.
Improving Signal Integrity in Lightly Loaded Systems
To insure that DRAM interface signal integrity is maintained for lightly loaded systems, series termination
and/or diodes (Gnd and Vcc diodes) are recommended on the following signals: CAS#/DQMx, MWEx,
SCASx, SRASx, CKEx, and all MA lines (note: RAS4# and RAS5# are also used as MA lines, depending on
the configuration, and should be terminated when used as MA lines). This will insure that the overshoot,
undershoot, and most importantly, ring-back does not cause any problems.
If series termination is used, use 10 ohms. This value provides the best signal integrity and flight time results.
Place as close to the driver as possible. If diodes are used, the diodes should have a forward current of at
least 200ma at 1 volt. A MMBD1203 diode or equivalent meets this requirement. The diodes should be
placed at the end of the trace.
Diodes improve signal integrity without increasing the flight time. A 10 ohm series resistor will increase the
flight time by approximately 300ps. Both provide similar signal integrity results.
2.6.
Signal States During And After A Hard Reset
Table 2 shows the state of all the MTXC output and bi-directional signals when RST# is asserted. An
undefined state means that the signal is driven either high or low, but not tri-stated.
Table 2. Signal States During/After Reset
Name
State during
RST#
State After
RST#
A[31:3]
Low
Tri-State
BRDY#
High
High
NA#
High
High
AHOLD
High
Low
EADS#
High
High
BOFF#
High
High
KEN#/INV
Low
Low
HD[63:0]
Tri-State
Tri-State
RAS[5:0]# or
CS[5:0]#
Undefined
High
CAS[7:0]# or
DQM[7:0]
Undefined
Undefined
MA[11:0],
BA1,MA13
Undefined
Undefined
MWE#,
MWEB#
High
High
SRAS[A,B]#
High
High
Table 2. Signal States During/After Reset
Name
State during
RST#
State After
RST#
SCAS[A,B]#
High
High
CKE,CKEB
Undefined
High
MD[63:0]
Tri-State
Tri-State
CADV#
High
High
CADS#
High
High
CCS#
Low
Low
COE#
High
High
GWE#
High
High
BWE#
High
High
TIO[7:0]
Low
Tri-State
TWE#
Low
High
KRQAK
Input
Input
AD[31:0]
Low
Tri-State
C/BE[3:0]#
Low
Tri-State
FRAME#
Tri-State
Tri-State
DEVSEL#
Tri-State
Tri-State
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