ACS8520T Semtech, ACS8520T Datasheet - Page 48

• Manufacturer Part Number: ACS8520T
• Description: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems
• Manufacturer: Semtech

Multiplexed Mode
In Multiplexed Mode, the device is configured to interface with microprocessors (e.g., Intel's 80x86 family) which share
bus signals between address and data. Figures 17 and 18 show the timing diagrams of read and write accesses.
Figure 17 Read Access Timing in MULTIPLEXED Mode
Table 25 Read Access Timing in MULTIPLEXED Mode (for use with Figure 17)
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
pw1
pw2
pw3
su1
su2
d1
d2
d3
d4
d5
h1
h2
h3
p1
p2
p2
Setup AD address valid to ALE
Setup CSB
Delay RDB
Delay RDB
Delay CSB
Delay RDB
Delay RDB
Delay CSB
RDB Low time (consecutive Read - Read)
RDB Low time (consecutive Write - Read)
RDY Low time (consecutive Read - Read)
RDY Low time (consecutive Write - Read)
ALE High time
Hold AD address valid after ALE
Hold CSB Low after RDB
Hold RDB Low after RDY
Time between ALE
Time between (consecutive Read - Read) accesses (RDB
ALE
Time between (consecutive Write - Read) accesses (RDB
ALE
rising edge
rising edge
falling edge
rising edge
falling edge
falling edge
falling edge
falling edge
rising edge
)
)
ALE
CSB
WRB
RDB
AD
RDY
falling edge
to RDY high-Z
to AD data high-Z
to RDY active
to RDB
to AD data valid (consecutive Read - Read)
to AD data valid (consecutive Write - Read)
to RDY
rising edge
rising edge
Z
t
pw3
t
falling edge
su1
falling edge
address
and RDB
Parameter
falling edge
falling edge
t
h1
t
d2
t
falling edge
p1
t
su2
X
FINAL
t
t
d1
d3
Page 48
t
pw1
t
pw2
data
rising edge
rising edge
t
h3
t
to
to
d4
t
h2
t
d5
160 ns
12 ns
17 ns
35 ns
35 ns
20 ns
20 ns
20 ns
5 ns
0 ns
5 ns
9 ns
0 ns
0 ns
0 ns
MIN
X
Z
-
-
-
-
F8110D_011ReadAccMultiplex_01
ACS8520 SETS
200 ns
60 ns
TYP
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
DATASHEET
www.semtech.com
193 ns
185 ns
40 ns
40 ns
13 ns
15 ns
10 ns
10 ns
MAX
-
-
-
-
-
-
-
-
-
-
-