參數(shù)資料
型號: P10C68-35
廠商: Zarlink Semiconductor Inc.
英文描述: CMOS/SNOS NVSRAM HIGH PERFORMANCE 8 K x 8 NON-VOLATILE STATIC RAM
中文描述: 的CMOS / SNOS非易失性SRAM的高性能8畝× 8非易失性靜態(tài)RAM的
文件頁數(shù): 13/17頁
文件大小: 162K
代理商: P10C68-35
P10C68/P11C68
13
OPERATING NOTES
Note: References to NE (bar) should be taken as applying
to P10C68 only and can be ignored for P11C68.
The devices have two separate modes of operation: SRAM
mode and non-volatile mode. In SRAM mode, the memory
operates as an ordinary static RAM. While in non-volatile
mode, data is transferred in parallel from SRAM to EEPROM
or from EEPROM to SRAM.
SRAM READ
The devices perform a read cycle when ever E (bar) and G
(bar) are LOW and NE (bar) and W (bar) are HIGH. The
address specified by the thirteen address pins A
0-12
determine
which of the 8192 data bytes will be accessed. When the
READ is initiated by an address transistion, the outputs will be
valid after a delay of t
AVQV
(READ CYCLE 1).
If the READ is initiated by E (bar) or G (bar), the outputs will
be valid at t
ELQV
or t
GLQV
, whichever is later. (READ CYCLE 2).
The data outputs will repeatedly respond to address changes
within the t
AVQV
access time without the need for transitions on
any control input pins and will remain valid until another
address change or until E (bar) or G (bar) is brought HIGH or
W (bar) or NE (bar) is brought LOW.
SRAM WRITE
A write cycle is performed whenever E (bar) and W (bar)
are LOW and NE (bar) is HIGH. The address inputs must be
stable prior to entering the WRITE cycle and must remain
stable until either E (bar) or W (bar) go HIGH at the end of the
cycle. The data on the eight pins DQ
0-7
, will be written into the
memory location specified by the address inputs if valid t
DVWH
before the end of a W (bar) controlled WRITE or t
DVEH
before
the end of an E (bar) controlled WRITE.
Figure 15. STORE/RECALL cycle 2. E (bar) controlled timing diagram (see notes 22, 25 and 27).
t
SKEW
t
AVAV
t
AVAV
t
AVAV
t
STORE /
t
RECALL
t
AVQZ
INVALID
ADDRESS 1
ADDRESS 2
ADDRESS 6
DATA VALID
DATA VALID
DATA VALID
DATA VALID
HIGH
IMPEDANCE
ADDRESS
DQ
(DATA
OUT)
Figure 14. STORE/RECALL cycle 1. Address controlled timing diagram (see notes 22, 26 and 27).
ADDRESS 1
ADDRESS 6
t
AVAV
t
AVAV
ADDRESS
E
t
ELEH
t
AVEL
t
EHAX
t
STORE /
t
RECALL
DATA VALID
DATA VALID
DATA VALID
HIGH
IMPEDANCE
DQ
(DATA
OUT)
t
ELQZ
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