M28W640HCT70N6E NUMONYX, M28W640HCT70N6E Datasheet - Page 16

• Manufacturer Part Number: M28W640HCT70N6E
• Description: TSOP-1 48 12X20 CUSTD FLASH
• Manufacturer: NUMONYX

Command interface
4
4.1
4.2
4.3
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Command interface
All bus write operations to the memory are interpreted by the command interface.
Commands consist of one or more sequential bus write operations. An internal
Program/Erase controller handles all timings and verifies the correct execution of the
Program and Erase commands. The Program/Erase controller provides a Status Register
whose output may be read at any time to monitor the progress of the operation, or the
Program/Erase states. See
see
interface.
The command interface is reset to Read mode when power is first applied, when exiting
from reset or whenever V
exactly. Any invalid combination of commands will reset the device to Read mode. Refer to
Table 4:
Read Memory Array command
The Read command returns the memory to its Read mode. One Bus Write cycle is required
to issue the Read Memory Array command and return the memory to Read mode.
Subsequent read operations will read the addressed location and output the data. When a
device Reset occurs, the memory defaults to Read mode.
Read Status Register command
The Status Register indicates when a program or erase operation is complete and the
success or failure of the operation itself. Issue a Read Status Register command to read the
Status Register’s contents. Subsequent bus read operations read the Status Register at any
address, until another command is issued. See
the definitions of the bits.
The Read Status Register command may be issued at any time, even during a
program/erase operation. Any read attempt during a program/erase operation will
automatically output the content of the Status Register.
Read Electronic Signature command
The Read Electronic Signature command reads the manufacturer and device codes and the
Block Locking Status, or the Protection Register.
The Read Electronic Signature command consists of one write cycle, a subsequent read will
output the manufacturer code, the device code, the Block Lock and Lock-Down Status, or
the Protection and Lock Register. See Tables 5,
Appendix
Commands, in conjunction with the text descriptions below.
D,
Table 31: Write state machine
DD
Table 3: Command
is lower than V
LKO
. Command sequences must be followed
codes, for a summary of the commands and
current/next, for a summary of the command
Table 11: Status Register
6
and
7
for the valid address.
M28W640HCT, M28W640HCB
bits, for details on