Advance Information
MT90863
AC Electrical Characteristics - Motorola Non-Multiplexed Bus Mode
Test
Conditions
Characteristics
Sym
Min
Typ
Max
Units
1
2
3
4
5
6
7
CS setup from DS falling
R/W setup from DS falling
Address setup from DS falling
CS hold after DS rising
t
0
ns
ns
ns
ns
ns
ns
ns
CSS
t
10
RWS
t
5
6
ADS
CSH
RWH
t
10
10
R/W hold after DS rising
Address hold after DS rising
t
t
ADH
Data setup from DTA low on read
Reading registers
Reading Memory
C =50pF
L
t
t
16
440
DDR_REG
DDR_MEM
8
9
Data hold on read
t
11
ns
C =50pF,
L
DHR
R =1K
L
Note 1
Data setup on write (fast write)
t
2
ns
ns
ns
ns
DSW_REG
10 Valid data delay on write (slow write)
11 Data hold on write
t
150
SWD
t
5
DHW
12 Acknowledgment delay:
Reading/writing registers
Reading/writing memory
C =50pF
L
t
t
40
470
AKD_REG
AKD_MEM
13 Acknowledgment hold time
t
17
ns
C =50pF,
AKH
L
RL=1K,
Note
Note:
1. High Impedance is measured by pulling to the appropriate rail with R , with timing corrected to cancel time taken to discharge C .
L
L
V
DS
CS
TT
t
t
CSH
CSS
V
TT
t
t
RWH
RWS
V
R/W
TT
t
t
ADS
ADH
V
VALID ADDRESS
TT
A0-A7
t
DHR
V
VALID READ DATA
D0-D15
READ
TT
TT
t
t
DHW
DSW
t
SWD
V
VALID WRITE DATA
D0-D15
WRITE
t
DDR
V
TT
DTA
t
AKD
t
AKH
Figure 16 - Motorola Non-Multiplexed Bus Timing
31
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