at49ld3200 ATMEL Corporation, at49ld3200 Datasheet - Page 15

• Manufacturer Part Number: at49ld3200
• Description: At49ld3200 32-megabit 1m X 32 Or 2m X 16 High-speed Synchronous Flash Memory
• Manufacturer: ATMEL Corporation

Asynchronous Boot
Block
1940B–FLASH–11/01
Input - Output Pin Pairs
The AT49LD3200B will automatically activate the Asynchronous Boot Block after
power-up and the AT49LD3200 can activate the Asynchronous Boot Block through the
Mode Register Set. The size of the boot block is 8K x 16 bits with addresses A
and outputs DQ
meaning the data at outputs will change according to the address inputs after t
out any external clocking signals.
Programs and erases are performed using the synchronous bus cycle operation (refer
to Command Definitions table and Program Cycle and Erase Cycle waveforms) after the
boot block is activated either through power-up or Mode Register Set. Programming of
the boot block is set up for x16 mode.
This Asynchronous Boot Block has a lockout feature that prevents programming or
erasing of data in this boot block once the feature has been enabled. This feature does
not have to be activated; the boot block’s usage as a protected region is optional to the
user. Once this feature is enabled, the data in the boot block can no longer be erased or
programmed when input levels of 3.6V or less are used. To activate the lockout feature,
Input
MR
RAS
CAS
DQM
CS
WORD
A12
A11
A10
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
CKE
CLK
WE
VPP
0
~ DQ
15
. The contents of the boot block are accessed asynchronously,
Output
DQ0, DQ16
DQ1, DQ17
DQ2
DQ18
DQ3
DQ19
DQ4
DQ20
DQ5
DQ21
DQ6, DQ22
DQ7, DQ23
DQ8, DQ24
DQ9, DQ25
DQ10
DQ26
DQ11
DQ27
DQ12
DQ28
DQ13, DQ29
DQ14, DQ30
DQ15, DQ31
AT49LD3200(B)
ACC
0
, with-
~ A
15
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