X2016P-55
| Model | X2016P-55 |
| Description | Memory IC, |
| PDF file | Total 21 pages (File size: 515K) |
| Chip Manufacturer | XICOR |
X20C16
WE Controlled Software Command Sequence
t
WC
Address
555
2AA
555
t
STO
OE
CE
t
AS
WE
t
NES
NE
t
SOE
Data Out
t
DS
Data In
AA
t
DH
t
NHZ
t
NEH
t
SP
t
AH
t
SPH
P
55
CMD
O
bs
AUTOSTORE Feature
The AUTOSTORE feature automatically saves the con-
tents of the X20C16’s static RAM to the on-board bit-
for-bit shadow EEPROM at power-down. This circuitry
insures that no data is lost during accidental power-
downs or general system crashes, and is ideal for
microprocessor caching systems, embedded software
systems, and general system back-up memory.
et
e
The AUTOSTORE instruction (EAS) to the SDP regis-
ter sets the AUTOSTORE enable latch, allowing the
X20C16 to automatically perform a store operation
whenever V
CC
falls below the AUTOSTORE threshold
(V
ASTH
). V
CC
must remain above the AUTOSTORE
Cycle End Voltage (V
ASEND
) for the duration of the
store cycle (t
ASTO
). The detailed timing for this feature
is illustrated in the AUTOSTORE timing diagram,
below. Once the AUTOSTORE cycle is initiated, all
other device func-tions are inhibited.
ol
ro
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Characteristics subject to change without notice.
du
12 of 21
REV 1.0 6/21/00
ct
t
OEST
