NS486SXL NSC [National Semiconductor], NS486SXL Datasheet - Page 19

• Manufacturer Part Number: NS486SXL
• Description: Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems
• Manufacturer: NSC [National Semiconductor]

t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Symbol
Symbol
ASC
ASR
CAC
CAH
CAS
CP
DH
DS
OFF
RAS
RAH
RCD
RCH
RCS
RP
WCH
WCS
ASC
ASR
CAC
CAH
CAS
CP
DH
DS
DRAM Interface Timing Specification
**The CLK signal is only included as a reference; no specifications are guarantee to this signal.
Column Address Setup Time
Row Address Setup Time
Access Time from CAS
Column Address Hold Time
CAS Pulse Width
Page Mode CAS Precharge
Write Data Hold Time
Write Data Setup Time
Read Data Valid Hold Time
RAS Pulse Width
Row Address Hold Time
RAS to CAS Delay Time
Read Command Hold Time
Read Command Setup Time
RAS Precharge Time
Write Command Hold Time
Write Command Setup Time
Column Address Setup Time
Row Address Setup time
Access Time from CAS
Column Address Hold Time
CAS Pulse Width
Page Mode CAS Precharge
Write Data Hold Time
Write Data Setup Time
TABLE 17. 4 Cycle Page Miss Preliminary Specifications
TABLE 18. 3 Cycle Miss Preliminary Specifications
Parameter
Parameter
FIGURE 8. DRAM Timing Diagram
19
Formula
Formula
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
2.5T +
0.5T +
1.5T +
0.5T +
1.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
0.5T +
Min
Min
−20
−20
−10
−20
−15
−10
−20
−20
−10
−20
−20
−20
−10
−20
−5
−5
−5
−5
−5
0
0
0
0
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DS100121-13
Progr’m’ble
Max
Max
−5
10
−5
10