AM28F512A Datasheet, PDF (13/34 Pages) Advanced Micro Devices – 512 Kilobit (64 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms

Embedded Programming Algorithm
The Embedded Program Setup is a command only op-
eration that stages the device for automatic program-
ming. Embedded Program Setup is performed by
writing 10h or 50h to the command register.
Once the Embedded Setup Program operation is per-
formed, the next WE# pulse causes a transition to an
active programming operation. Addresses are latched
on the falling edge of CE# or WE# pulse, whichever
happens later. Data is latched on the rising edge of
WE# or CE#, whichever happens first. The rising edge
of WE# also begins the programming operation. The
system is not required to provide further controls or
timings. The device will automatically provide an ade-
quate internally generated program pulse and verify
margin. The automatic programming operation is
completed when the data on DQ7 is equivalent to data
written to this bit (see Write Operation Status section)
at which time the device returns to Read mode.
Figure 2 and Table 5 illustrate the Embedded Program
algorithm, a typical command string, and bus operation.
START
Apply V_PPH
Write Embedded Setup Program Command
Write Embedded Program Command (A/D)
Data# Poll Device
Increment Address
No
Last Address
Yes
Programming Completed
Figure 2. Embedded Programming Algorithm
18880C-7
Table 5. Embedded Programming Algorithm
Bus Operations
Command
Comments
Standby
Write
Wait for V_PP Ramp to V_PPH (see Note)
Embedded Program Setup Command Data = 10h or 50h
Write
Read
Embedded Program Command
Valid Address/Data
Data# Polling to Verify Completion
Read
Available for Read Operations
Note: See AC and DC Characteristics for values of V_PP parameters. The V_PP power supply can be hard-wired to the device or
switchable. When V_PP is switched, V_PPL may be ground, no connect with a resistor tied to ground, or less than V_CC + 2.0 V. Refer
to Functional Description. Device is either powered-down, erase inhibit or program inhibit.
Am28F512A
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