Vizio VW42L HDTV10A, Service Manual

Page: 58 / 98

CONFIDENTIAL – DO NOT COPY Page 7-27
File No. SG-0211
SOFTWARE COMMAND DEFINITIONS :
Device operations are selected by writing specific address and data sequences into the
command register. Writing incorrect address and data values or writing them in the
improper sequence will reset the device to the read mode. Table 3 defines the valid
register command sequences. Note that the Erase Suspend (B0H) and Erase Resume
(30H) commands are valid only while the Sector Erase operation is in progress. Either
of the two reset command sequences will reset the device (whenapplicable).
All addresses are latched on the falling edge of WE or CE, whichever happens later. All
data are latched on rising edge of WE or CE, whichever happens first.
WRITE OPERATION STATUS
The device provides several bits to determine the status of a write operation: Q2, Q3,
Q5, Q6, Q7, and RY/BY.Table B and the following subsections describe the functions
of these bits. Q7, RY/BY, and Q6 each offer a method for determining whether a
program or erase operation is complete or in progress. These three bits are discussed
first.
Table B. Write Operation Status
Notes:
1.Performing successive read operations from the erase-suspended sector will cause
Q2 to toggle.
2.Performing successive read operations from any address will cause Q6 to toggle.
3.Reading the byte/word address being programmed while in the erase-suspend
program mode will indicate logic "1" at the Q2 bit.
However, successive reads from the erase-suspended sector will cause Q2 to toggle.
Fig C. COMMAND WRITE OPERATION