s71ws512ne0bfwzz Meet Spansion Inc., s71ws512ne0bfwzz Datasheet - Page 57

• Manufacturer Part Number: s71ws512ne0bfwzz
• Description: Stacked Multi-chip Product Mcp Flash Memoy And Psram Cmos 1.8 Volt, Simultaneous Operation, Burst Mode Flash Memory And Pseudo-static Ram
• Manufacturer: Meet Spansion Inc.

June 28, 2004 S71WS512NE0BFWZZ_00_A1
Unlock Bypass Command Sequence
The unlock bypass feature allows faster programming than the standard program
command sequence. The unlock bypass command sequence is initiated by first
writing two unlock cycles. This is followed by a third write cycle containing the
unlock bypass command, 20h. The device then enters the unlock bypass mode.
A two-cycle unlock bypass program command sequence is all that is required to
program in this mode. The first cycle in this sequence contains the unlock bypass
program command, A0h; the second cycle contains the program address and
data. Additional data is programmed in the same manner. This mode dispenses
with the initial two unlock cycles required in the standard program command se-
A d v a n c e
S29WSxxxN MirrorBit™ Flash Family For Multi-chip Products (MCP)
Figure 2. Write Buffer Programming Operation
DQ1 = 1?
No
Yes
Yes
No
Write next address/data pair
I n f o r m a t i o n
Write number of addresses
Write first address/data
Write program buffer to
Read DQ15 - DQ0 with
Write “Write to Buffer”
address = Last Loaded
Read DQ15 - DQ0 at
Last Loaded Address
to program minus 1
flash sector address
and Sector Address
Buffer Operation?
command and
Sector Address
FAIL or ABORT
Abort Write to
WC = WC - 1
DQ7 = Data?
DQ7 = Data?
(WC = 31)
DQ5 = 1?
WC = 0 ?
Address
No
Yes
No
No
No
Yes
Yes
Yes
Must write “Write-to-buffer
Part of “Write to Buffer”
Command Sequence
Write to buffer ABORTED.
Abort Reset” command
Write to a different
sequence to return
sector address
to read mode.
PASS
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