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参数资料
| 型号： | S29CD032J1JFAI122 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 2.7V PROM, 54 ns, PBGA80 |
| 封装： | 13 X 11 MM, 1 MM PITCH, FORTIFIED, BGA-80 |
| 文件页数： | 43/78页 |
| 文件大小： | 1825K |
| 代理商： | S29CD032J1JFAI122 |
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46
S29CD-J & S29CL-J Flash Family
S29CD-J_CL-J_00_B1 September27,2006
Prel imi n ary
9.6.1
WP# Method
The Write Protect feature provides a hardware method of protecting the two outermost sectors
of the large bank.
If the system asserts VIL on the WP# pin, the device disables program and erase functions in the
two "outermost" boot sectors (8-Kbyte sectors) in the large bank. If the system asserts VIH on
the WP# pin, the device reverts to whether the boot sectors were last set to be protected or
unprotected. That is, sector protection or unprotection for these sectors depends on whether
they were last protected or unprotected.
Note that the WP# pin must not be left floating or unconnected as inconsistent behavior of the
device may result.
The WP# pin must be held stable during a command sequence execution
9.6.2
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not accept any write cycles. This protects data dur-
ing VCC power-up and power-down.
The command register and all internal program/erase circuits are disabled, and the device resets
to reading array data. Subsequent writes are ignored until VCC is greater than VLKO. The system
must provide the proper signals to the control inputs to prevent unintentional writes when VCC
is greater than VLKO.
9.6.3
Write Pulse “Glitch Protection”
Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
9.6.4
Power-Up Write Inhibit
If WE# = CE# = RESET# = VIL and OE# = VIH during power-up, the device does not accept
commands on the rising edge of WE#. The internal state machine is automatically reset to the
read mode on power-up.
9.6.5
VCC and VIO Power-up And Power-down Sequencing
The device imposes no restrictions on VCC and VIO power-up or power-down sequencing. As-
serting RESET# to VIL is required during the entire VCC and VIO power sequence until the
respective supplies reach the operating voltages. Once, VCC and VIO attain the operating volt-
ages, deassertion of RESET# to VIH is permitted.
9.6.6
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = VIL, CE# = VIH, or WE# = VIH. To initiate
a write cycle, CE# and WE# must be a logical zero (VIL) while OE# is a logical one (VIH).
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