Tandy 1000
Technical Reference Manual
Main System Board
Ram
Timing Specification
AC
Operating Conditions and Characteristics
Parameter Symbol Min. Max.
Units
Random Read or Write Cycle Time tRC 279
-
ns
Read Write Cycle Time
tRWC
279
-
ns
Access Time from Row Address tRAC
-
200
ns
Strobe
Access Time from Column
tCAC
-
100
ns
Address
Output Buffer and Turn-Off Delay tOFF
0
30
ns
Row Address Strobe Precharge
tRP
100
-
ns
Time
Row Address Strobe Pulse Width
tRAS1
170
-
ns
Column Address Strobe Pulse tCAS 130
-
ns
Width
Row Address Setup Time
tASR
0
-
ns
Row Address Hold Time
tRAH
20
-
ns
Column Address Setup Time tASC
0
-
ns
Column Address Hold Time tCAH
35
-
ns
Transition Time (Rise and
Fall)
tT
-
50
ns
Read Command Setup Time
tRCS
0
-
ns
Read Command Hold Time
tRCH
0
-
ns
Read Command Hold Time
tRRH
0
-
ns
Referenced to
RAS
Write Command Hold Time
tWCH 35
-
ns
Write Command Hold Time tWCR
95
-
ns
Referenced to
RAS
Write Command Pulse Width
tWP
35
-
ns
Write Command to Row Strobe tRWL
45
-
ns
Lead Time
Write Command to Column
tCWL
45
-
ns
Strobe Lead Time
Data
in
Setup Time tDS
0 ns
Data
in
Hold Time tDH
35
-
ns
Data
in
Hold Time Referenced tDHR
95
-
ns
to
RAS
Column to Row Strobe
tCRP
0
-
ns
Precharge Time
RAS
Hold Time
tRSH
85
-
ns
Refresh Period tRFSH
-
2.0
ns
WRITE
Command Setup Time tWCS
0
-
ns
CAS to
WRITE
Delay tCWD
45
-
ns
RAS
to
WRITE
Delay tRWD
120
-
ns
CAS Hold Time
tCSH
200
-
ns
41
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