at49bv6416c ATMEL Corporation, at49bv6416c Datasheet - Page 9

• Manufacturer Part Number: at49bv6416c
• Description: 64-megabit 4m X 16 Page Mode 2.7-volt Flash Memory
• Manufacturer: ATMEL Corporation

3.12
3.13
3.14
3.15
3465D–FLASH–04/06
Common Flash Interface (CFI)
Hardware Data Protection
Input Levels
Output Levels
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 benefits 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 any address. 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 system can read CFI
data at the addresses given in the
return to the read mode, the read command should be issued.
Hardware features protect against inadvertent programs to the AT49BV6416C(T) in the follow-
ing ways: (a) V
erase functions are inhibited. (b) V
level, 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) Noise filter:
pulses of less than 15 ns (typical) on the WE or CE inputs will not initiate a program cycle. (e)
V
While operating with a 2.7V to 3.6V 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 be driven from 0 to V
For the AT49BV6416C(T), output high levels are equal to V
3.6V output levels, V
PP
is less than V
CC
ILPP
sense: if V
CCQ
.
must be tied to V
CC
is below 1.8V (typical), the device is reset and the program and
“Common Flash Interface Definition Table” on page
CC
CCQ
power-on delay: once V
CC
+ 0.6V.
.
CCQ
AT49BV6416C(T)
CC
- 0.1V (not V
has reached the V
CC
). For 2.7V to
CC
27. To
sense
9