Vizio VX37L HDTV10A, Service Manual

Page: 57 / 147

CONFIDENTIAL
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DO NOT COPY Page
7-
26
File No. SG-0209
BUS OPERATION-2
Notes:
1.Code=00h means unprotected, or code=01h protected.
2.Code=99 means factory locked, or code=19h not factory locked.
WRITE COMMANDS/COMMAND SEQUENCES
To program data to the device or erase sectors of memory , the system must drive WE and
CE to VIL, and OE to VIH.An erase operation can erase one sector, multiple sectors , or the
entire device. A "sector address" consists of the address bits required to uniquely select a
sector. Writing specific address and data commands or sequences into the command
register initiates device operations. Table A defines the valid register command sequences.
Writing incorrect address and data values or writing them in the improper sequence resets
the device to reading array data. Section has details on erasing a sector or the entire chip, or
suspending/resuming the erase operation.
After the system writes the Automatic Select command sequence, the device enters the
Automatic Select mode. The system can then read Automatic Select codes from the internal
register (which is separate from the memory array) on Q7-Q0. Standard read cycle timings
apply in this mode. Refer to the Automatic Select Mode and Automatic Select Command
Sequence section for more information.ICC2 in the DC Characteristics table represents the
active current specification for the write mode. The "AC Characteristics" section contains
timing specification table and timing diagrams for write operations.