at49sv163d ATMEL Corporation, at49sv163d Datasheet - Page 8

• Manufacturer Part Number: at49sv163d
• Description: 16-megabit 1m X 16 1.8-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

4.13
4.14
4.15
4.16
8
RDY/BUSY
Common Flash Interface (CFI)
Hardware Data Protection
Input Levels
AT49SV163D(T)
An open-drain READY/BUSY output pin provides another method of detecting the end of a
program or erase operation. RDY/BUSY is actively pulled low during the internal program and
erase cycles and is released at the completion of the cycle. The open-drain connection allows
for OR-tying of several devices to the same RDY/BUSY line. Please see
page 11
CFI is a published, standardized data structure that may be read from a flash device. CFI
allows system software to query the installed device to determine the configurations, various
electrical and timing parameters, and functions supported by the device. CFI is used to allow
the system to learn how to interface to the flash device most optimally. The two primary bene-
fits of using CFI are ease of upgrading and second source availability. The command to enter
the CFI Query mode is a one-bus cycle command which requires writing data 98h to address
55h. The CFI Query command can be written when the device is ready to read data or can
also be written when the part is in the product ID mode. Once in the CFI Query mode, the sys-
tem can read CFI data at the addresses given in
on page
The Hardware Data Protection feature protects against inadvertent programs to the
AT49SV163D(T) in the following ways: (a) V
gram function is inhibited. (b) V
the device will automatically time out 10 ms (typical) before programming. (c) Program inhibit:
holding any one of OE low, CE high or WE high inhibits program cycles. (d) Program inhibit:
V
While operating with a 1.65V to 1.95V power supply, the address inputs and control inputs
(OE, CE and WE) may be driven from 0 to 5.5V without adversely affecting the operation of
the device. The I/O lines can only be driven from 0 to V
PP
is less than V
for more details.
24. To exit the CFI Query mode, the product ID exit command must be given.
ILPP.
CC
power-on delay: once V
CC
sense: if V
“Common Flash Interface Definition Table”
CC
CC
+ 0.6V.
CC
has reached the V
is below 1.65V (typical), the pro-
“Status Bit Table” on
CC
3656A–FLASH–2/07
sense level,