s71ws256jc0 Meet Spansion Inc., s71ws256jc0 Datasheet - Page 33

• Manufacturer Part Number: s71ws256jc0
• Description: Stacked Multi-chip Product Mcp 128/64 Megabit 8m/4m X 16-bit Cmos 1.8 Volt-only, Simultaneous Read/write, Burst Mode Flash Memory With Cellularram
• Manufacturer: Meet Spansion Inc.

11.7
11.8
June 24, 2005 S29WS-J_M0_A4
Accelerated Program Operation
Autoselect Mode
providing an address, command, and data. Addresses are latched on the last falling edge of WE#
or CE#, while data is latched on the 1st rising edge of WE# or CE#. The asynchronous and syn-
chronous programing operation is independent of the Set Device Read Mode bit in the
Configuration Register (see
The device features an Unlock Bypass mode to facilitate faster programming. Once the device en-
ters the Unlock Bypass mode, only two write cycles are required to program a word, instead of
four.
An erase operation can erase one sector, multiple sectors, or the entire device.
“WS128J Sector Address Table,” on page 49
page 57
into four banks. A “bank address” is the address bits required to uniquely select a bank. Similarly,
a “sector address” is the address bits required to uniquely select a sector.
I
the write mode. The AC Characteristics section contains timing specification tables and timing di-
agrams for write operations.
The device offers accelerated program operations through the ACC function. ACC is primarily in-
tended to allow faster manufacturing throughput at the factory.
If the system asserts V
lock Bypass mode and uses the higher voltage on the input to reduce the time required for
program operations. The system would use a two-cycle program command sequence as required
by the Unlock Bypass mode. Removing V
eration. Note that sectors must be unlocked prior to raising ACC to V
must not be at V
result. In addition, the ACC pin must not be left floating or unconnected; inconsistent behavior of
the device may result.
When at V
The autoselect mode provides manufacturer and device identification, and sector protection ver-
ification, through identifier codes output from the internal register (which is separate from the
memory array) on DQ15–DQ0. This mode is primarily intended for programming equipment to
automatically match a device to be programmed with its corresponding programming algorithm.
However, the autoselect codes can also be accessed in-system through the command register.
When using programming equipment, the autoselect mode requires V
dress pins must be as shown in
page
appropriate highest order address bits (see
Table 11.3
been set as required, the programming equipment may then read the corresponding identifier
code on DQ15–DQ0. However, the autoselect codes can also be accessed in-system through the
command register, for instances when the device is erased or programmed in a system without
access to high voltage on the A9 pin. The command sequence is illustrated in
mand Definitions,” on page
A20 for the WS128J (A21:A19 for the WS064J) is asserted during the third write cycle of the au-
toselect command, the host system can read autoselect data that bank and then immediately
read array data from the other bank, without exiting the autoselect mode.
CC2
in the “DC Characteristics” section on page 89 represents the active current specification for
32. In addition, when verifying sector protection, the sector address must appear on the
indicate the address space that each sector occupies. The device address space is divided
IL
shows the remaining address bits that are don’t care. When all necessary bits have
, ACC locks all sectors. ACC should be at V
HH
for operations other than accelerated programming, or device damage may
D a t a
HH
on this input, the device automatically enters the aforementioned Un-
Table 14.4, “Configuration Register,” on page
77. Note that if a Bank Address (BA) on address bits A22, A21, and
S h e e t
S29WS128J/064J
Table 11.3, “Autoselect Codes (High Voltage Method),” on
HH
from the ACC input returns the device to normal op-
and
Table , “,” on page 33
Table 13.6, “WS064J Sector Address Table,” on
IH
for all other conditions.
and
HH
ID
. Note that the ACC pin
Table , “,” on page
on address pin A9. Ad-
67).
Table 14.5, “Com-
Table 13.5,
35).
31