Tandy 1000 HX - AC Operating Conditions and Characteristics

. TANDY COMPUTER PRODUCTS •
Main System Board Ram Timing Specification
AC Operating Conditions and Characteristics
Parameter
Random Read or Write Cycle Time
Read Write Cycle Time
Access Time from Row Address
Strobe
Access Time from Column Address
Output Buffer and Turn-off Delay
Row Address Strobe Precharge Time
Row Address Strobe Pulse Width
Column Address Strobe Pulse Width
Row Address Setup Time
Row Address Hold Time
Column Address Setup Time
Column Address Hold Time
Transition Time (Rise and Fall)
Read Command Setup Time
Read Command Hold Time
Read Command Hold Time Referenced
to RAS
Write Command Hold Time
Write Command Hold Time Referenced
to RAS
Write Command Pulse Width
Write Command to Row Strobe Lead
Time
Write Command to Column Strobe
Lead Time
Data in Setup Time
Data in Hold Time
Data in Hold Time Referenced to
RAS
Column to Row Strobe Precharge
Time
RAS Hold Time
Refresh Period
WRITE Command Setup Time
CAS to WRITE Delay
RAS to WRITE Delay
CAS Hold Time
Symbol
tRC
tRWC
tRAC
tCAC
tOFF
tRP
tRASl
tCAS
tASR
tRAH
tASC
tCAH
tT
tRCS
tRCH
tRRH
tWCH
tWCR
tWP
tRWL
tCWL
tDS
tDH
tDHR
tCRP
tRSH
tRFSH
twcs
tCWD
tRWD
tCSH
Min.
279
279
—
—
0
100
170
130
0
20
0
35
—
0
0
0
35
95
35
45
45
0
35
95
0
85
—
0
45
120
200
Max.
—
—
200
100
30
—
—
—
—
—
—
—
50
—
—
—
—
—
—
—
—
—
——
—
2.0
—
—
—
——
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 16. Main System Board RAM Timing Specification
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