Intel
£
Advanced+ Boot Block Flash Memory (C3)
Datasheet 13
2.3 Signal Descriptions
Table 2 lists the active signals used and provides a brief description of each.
Table 2. Signal Descriptions
Symbol Type Name and Function
A[MAX:0] INPUT
ADDRESS INPUTS for memory addresses. Address are internally latched during a program or erase
cycle.
8 Mbit: AMAX= A18
16 Mbit: AMAX = A19
32 Mbit: AMAX = A20
64 Mbit: AMAX = A21
DQ[15:0]
INPUT/
OUTPUT
DATA INPUTS/OUTPUTS: Inputs data and commands during a write cycle; outputs data during read
cycles. Inputs commands to the Command User Interface when CE# and WE# are active. Data is
internally latched. The data pins float to tri-state when the chip is de-selected or the outputs are
disabled.
CE# INPUT
CHIP ENABLE: Active-low input. Activates the internal control logic, input buffers, decoders and sense
amplifiers. CE# is active low. CE# high de-selects the memory device and reduces power consumption
to standby levels.
OE# INPUT
OUTPUT ENABLE: Active-low input. Enables the device’s outputs through the data buffers during a
Read operation.
RP# INPUT
RESET/DEEP POWER-DOWN: Active-low input.
When RP# is at logic low, the device is in reset/deep power-down mode, which drives the outputs to
High-Z, resets the Write State Machine, and minimizes current levels (I
CCD
).
When RP# is at logic high, the device is in standard operation. When RP# transitions from logic-low to
logic-high, the device resets all blocks to locked and defaults to the read array mode.
WE# INPUT
WRITE ENABLE: Active-low input. WE# controls writes to the device. Address and data are latched on
therisingedgeoftheWE#pulse.
WP# INPUT
WRITE PROTECT: Active-low input.
When WP# is a logic low, the lock-down mechanism is enabled and blocks marked lock-down cannot
be unlocked through software.
When WP# is logic high, the lock-down mechanism is disabled and blocks previously locked-down are
now locked and can be unlocked and locked through software. After WP# goes low, any blocks
previously marked lock-down revert to the lock-down state.
See Section 5.0, “Security Modes” on page 27 for details on block locking.
VPP
INPUT/
POWER
PROGRAM/ERASE POWER SUPPLY: Operates as an input at logic levels to control complete device
protection. Supplies power for accelerated Program and Erase operations in 12 V
± 5% range. This pin
cannot be left floating.
Lower VPP
≤ VPPLK to protect all contents against Program and Erase commands.
Set VPP = VCC for in-system Read, Program and Erase operations. In this configuration, VPP can
drop as low as 1.65 V to allow for resistor or diode drop from the system supply.
Apply VPP to 12 V
± 5% for faster program and erase in a production environment. Applying 12 V ± 5%
to VPP can only be done for a maximum of 1000 cycles on the main blocks and 2500 cycles on the
boot blocks. VPP may be connected to 12 V for a total of 80 hours maximum. See Section 5.6 for
details on VPP voltage configurations.
VCC POWER
DEVICE CORE POWER SUPPLY: Supplies power for device operations.
VCCQ POWER
OUTPUT POWER SUPPLY: Output-driven source voltage. This ball can be tied directly to V
CC
if
operating within V
CC
range.
GND POWER
GROUND: For all internal circuitry. All ground inputs must be connected.
DU -
DON’T USE: Do not use this ball. This ball should not be connected to any power supplies, signals or
other balls, and must be left floating.
NC -
NO CONNECT: Pin must be left floating.
