DS87C520_1 Datasheet, PDF (30/42 Pages) Dallas Semiconductor – EPROM/ROM High-Speed Micro

MOVX CHARACTERISTICS
PARAMETER
SYMBOL
Data Access ALE Puls e Width
Address Hold after ALE Low for
MOVX Write
RD Pulse Width
WR Pulse Width
RD Low to Valid Data In
Data Hold After Read
Data Float after Read
ALE Low to Valid Data In
Port 0 Address to Valid Data In
Port 2 Address to Valid Data In
ALE Low to RD or WR Low
Port 0 Address to RD or WR Low
Port 2 Address to RD or WR Low
Data Valid to WR Transition
Data Hold after Write
RD Low to Address Float
RD or WR High to ALE High
t_LHLL2
t_LLAX2
t_RLRH
t_WLWH
t_RLDV
t_RHDX
t_RHDZ
t_LLDV
t_AVDV1
t_AVDV2
t_LLWL
t_AVWL1
t_AVWL2
t_QVWX
t_WHQX
t_RLAZ
t_WHLH
VARIABLE CLOCK
MIN
1.5t _CLCL -5
2t_CLCL -5
0.5t _CLCL -5
t_CLCL -5
2t_CLCL -5
t_MCS-10
2t_CLCL -5
t_MCS-10
0
0.5t _CLCL -5
t_CLCL -5
t_CLCL -5
2.5t _CLCL -5
1.5t _CLCL -10
2.5t _CLCL -10
-5
MAX
2t_CLCL -20
t_MCS-20
t_CLCL -5
2t_CLCL -5
2.5t _CLCL -20
t_MCS+ t_CLCL-40
3t_CLCL -20
t_MCS+1.5t _CLCL -20
3.5t _CLCL -20
t_MCS+2t_CLCL -20
0.5t _CLCL +5
t_CLCL +5
t_CLCL -5
2t_CLCL -5
0
t_CLCL -5
-0.5t _CLCL -5
10
t_CLCL +5
DS87C520/DS83C520
UNITS STRETCH
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
t_MCS=0
t_MCS>0
ns
ns
t_MCS=0
t_MCS>0
ns
ns
t_MCS=0
t_MCS>0
NOTE:
t_MCS is a time period related to the Stretch memory cycle selection. The following table shows the value of
t_MCS for each Stretch selection.
M2
M1
M0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
MOVX CYCLES
2 machine cycles
3 machine cycles (default)
4 machine cycles
5 machine cycles
6 machine cycles
7 machine cycles
8 machine cycles
9 machine cycles
30 of 42
t_MCS
0
4 t_CLCL
8 t_CLCL
12 t_CLCL
16 t_CLCL
20 t_CLCL
24 t_CLCL
28 t_CLCL