mc68307ad Freescale Semiconductor, Inc, mc68307ad Datasheet - Page 26

• Manufacturer Part Number: mc68307ad
• Description: Integrated Multiple-bus Processor
• Manufacturer: Freescale Semiconductor, Inc

PRELIMINARY 8051 BUS INTERFACE MODULE
AC ELECTRICAL SPECIFICATIONS
26
(V
NOTE:
TWLWH WR pulse width
TQVWH Data valid to WR high
TWHQX Data held after WR
Symbol
TQVWX
TRHDX
TAVWL
TWHLH
TRLRH
TRHDZ
TAVDV
TRLDV
TLLWL
TLLDV
TRLAZ
TLHLL
TAVLL
TLLAX
CC
a. Wait states can be added.
t
cyc
= 5.0V
BGACK
Strobes
and
R/W
CLK
BG
BR
Cycle time
ALE pulse width
Address valid to ALE low
Address hold after ALE low
RD pulse width
RD low to valid data in
Data hold after RD
Data float after RD
ALE low to valid data in
Address to valid data in
ALE low to RD or WR low
Address to RD low or WR low
Data valid to WR transition
RD low to address float
RD or WR high to ALE high
0.5V or 3.3Vdc
Characteristic
a
(1)
35
0.3V; GND = 0Vdc; T
(1)
33
(1)
(1)
(1)
38
MC68307 TECHNICAL INFORMATION
Figure 10. Bus Arbitration Timing
A
4 x t
7 x t
= T
2 x t
3 x t
t
t
t
t
t
cyc
cyc
cyc
5 x t
5 x t
37
cyc
cyc
L
cyc
cyc
Min
120
cyc
cyc
to T
—
—
—
—
—
0
– 50
– 40
– 40
– 35
– 60
cyc
cyc
– 150
46
– 130
– 50
– 40
H
8 MHz
) (See Figures 11 and 12)
3.3V
5 x t
8 x t
9 x t
3 x t
0.5 x t
t
cyc
cyc
cyc
cyc
Max
cyc
—
—
—
—
—
—
—
—
—
—
—
—
+ 50
34
– 165
– 150
– 165
+ 50
cyc
39
4 x t
7 x t
2 x t
3 x t
t
t
t
t
t
cyc
cyc
cyc
5 x t
5 x t
cyc
cyc
cyc
cyc
Min
cyc
cyc
60
—
—
—
—
—
0
– 50
– 40
– 40
– 35
– 60
cyc
cyc
– 150
– 130
– 50
– 40
16.67 MHz
5V
36
5 x t
8 x t
9 x t
3 x t
0.5 x t
t
—8051
cyc
cyc
cyc
cyc
Max
cyc
—
—
—
—
—
—
—
—
—
—
—
+ 50
MOTOROLA
– 165
– 150
– 165
+ 50
cyc
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns