HY29LV320 Datasheet, PDF (4/44 Pages) Hynix Semiconductor – 32 Mbit (2M x 16) Low Voltage Flash Memory

HY29LV320
SIGNAL DESCRIPTIONS
Name
Type
Description
A[20:0]
Inputs
Address, active High. These 21 inputs select one of 2,097,152 (2M) words
within the array for read or write operations.
DQ[15:0]
Inputs/Outputs Data Bus, active High. These pins provide a 16-bit data path for read and
Tri-state write operations.
CE#
Input
Chip Enable, active Low. This input must be asserted to read data from or
write data to the HY29LV320. When High, the data bus is tri-stated and the
device is placed in the Standby mode.
OE#
Input
Output Enable, active Low. This input must be asserted for read operations
and negated for write operations. When High, data outputs from the device are
disabled and the data bus pins are placed in the high impedance state.
WE#
Input
Write Enable, active Low. Controls writing of commands or command
sequences for various device operations. A write operation takes place when
WE# is asserted while CE# is also Low and OE# is High.
RESET#
Input
Hardware Reset, active Low. Provides a hardware method of resetting the
HY29LV320 to the read array state. When the device is reset, it immediately
terminates any operation in progress. The data bus is tri-stated and all read/write
commands are ignored while the input is asserted. While RESET# is asserted
the device will be in the Standby mode.
RY/BY#
Output
Open Drain
Ready/Busy Status. Indicates whether a write or erase command is in
progress or has been completed. Valid after the rising edge of the final WE#
pulse of a command sequence. Remains Low while the device is actively
programming data or erasing, and goes High when it is ready to read array data.
Write Protect, active Low/Accelerate (V_HH).
Placing this pin at V_IL disables program and erase operations in the top or bottom
32K words of the array. The affected sectors are sectors S0 - S3 for the
HY29LV320B and sectors S63 - S66 for the HY29LV320T.
If the pin is placed at V_IH, the protection state of those two sectors reverts to
whether they were last set to be protected or unprotected using the Sector Group
Protection and Unprotection capability of the HY29LV320.
WP#/ACC
Input
If V_HH is applied to this input, the device enters the Unlock Bypass mode,
temporarily unprotects any protected sectors, and uses the higher voltage on the
pin to reduce the time required for program operations. (The system would then
use the two-cycle program command sequence as required by the Unlock
Bypass mode.) Removing V_HH from the pin returns the device to normal
operation.
This pin must not be at V_HH for operations other than accelerated programming,
or device damage may result. Leaving the pin floating or unconnected may result
in inconsistent device operation.
V_IH
Input
High Input. Connect to V_IH or to V_CC to provide compatibility with similar x8/x16
devices.
V_CC
--
3-volt (nominal) power supply.
V_SS
--
Power and signal ground.
4
r1.3/May 02