M27W032-100M1 STMicroelectronics, M27W032-100M1 Datasheet - Page 12

• Manufacturer Part Number: M27W032-100M1
• Manufacturer: STMicroelectronics

Specifications of M27W032-100M1

• Density: 32Mb
• Organization: 2Mx16
• Interface Type: Parallel
• Bus Type: Parallel
• In System Programmable: External
• Access Time (max): 100ns
• Package Type: SO
• Reprogramming Technique: OTP
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Supply Current: 10mA
• Pin Count: 44
• Mounting: Surface Mount
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Supplier Unconfirmed

M27W032
STATUS REGISTER
Bus Read operations from any address always
read the Status Register during Program opera-
tions. The bits in the Status Register are summa-
rized in Table 6, Status Register Bits.
Data Polling Bit (DQ7). The Data Polling Bit can
be used to identify whether the Program Controller
has successfully completed its operation. The
Data Polling Bit is output on DQ7 when the Status
Register is read.
During a Word Program operation the Data Polling
Bit outputs the complement of the bit being pro-
grammed to DQ7. After successful completion of
the Word Program operation the memory returns
to Read mode and Bus Read operations from the
address just programmed output DQ7, not its com-
plement.
Figure 6, Data Polling Flowchart, gives an exam-
ple of how to use the Data Polling Bit. A Valid Ad-
dress is the address being programmed.
Toggle Bit (DQ6). The Toggle Bit can be used to
identify whether the Program Controller has suc-
cessfully completed its operation. The Toggle Bit
is output on DQ6 when the Status Register is read.
During Program operations the Toggle Bit chang-
es from ’0’ to ’1’ to ’0’, etc., with successive Bus
Read operations at any address. After successful
completion of the operation the memory returns to
Read mode.
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Figure 7, Data Toggle Flowchart, gives an exam-
ple of how to use the Data Toggle Bit.
Error Bit (DQ5). The Error Bit can be used to
identify errors detected by the Program Controller.
The Error Bit is set to ’1’ when a Program opera-
tion fails to write the correct data to the memory. If
the Error Bit is set a Read/Reset command must
be issued before other commands are issued. The
Error bit is output on DQ5 when the Status Regis-
ter is read.
Note that the Program command cannot change a
bit set to ’0’ back to ’1’ and attempting to do so will
set DQ5 to ‘1’. A Bus Read operation to that ad-
dress will show the bit is still ‘0’.
V
used to identify if any Program operation has failed
due to a V
any Program operation, the operation aborts and
DQ4 is set to ‘1’. If V
the Program operation, the operation completes
and DQ4 is set to ‘0’.
Multiple Word Program Bit (DQ0). The Multiple
Word Program Bit can be used to indicate whether
the Program Controller is active or inactive during
Multiple Word Program. When the Program Con-
troller has written one Word and is ready to accept
the next Word, the bit is set to ‘0’.
Status Register Bit DQ1 is reserved.
PP
Status Bit (DQ4). The V
PP
error. If V
PP
remains at V
PP
falls below V
PP
Status Bit can be
HH
throughout
HH
during