ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 61

• Manufacturer Part Number: ACS8509
• Description: Synchronous Equipment Timing Source for Sonet or SDH Network Elements
• Manufacturer: Semtech Corporation

EPROM Mode
This mode is suitable for use with an EPROM, in which configuration data is stored (one-way communication - status
information will not be accessible). A state machine internal to the ACS8509 device will perform numerous EPROM
read operations to read the data out of the EPROM. In EPROM Mode, the ACS8509 takes control of the bus as Master
and reads the device set-up from an AMD AM27C64 type EPROM at lowest speed (250ns) after device set-up (system
reset). The EPROM access state machine in the up interface sequences the accesses. Figure 23 shows the access
timing of the device in EPROM mode.
Further information can be found in the AMD AM27C64 datasheet.
Figure 23 Access Timing in EPROM mode
Table 40 Access Timing in EPROM mode (For use with Figure 23)
Revision 2.00/January 2006 © Semtech Corp.
ADVANCED COMMUNICATIONS
Symbol
t
CSB (=OEB)
A
AD
acc
Delay CSB
Z
falling edge
or A change to AD valid
t
acc
Parameter
address
FINAL
Page 61
data
MIN
-
Z
ACS8509 SETS
F8110D_015ReadAccEEPROM_01
TYP
-
DATASHEET
www.semtech.com
920 ns
MAX