Sharp 32LF-94EC, Service Manual, Page: 39 / 82

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AK53 D.O.C. Service Manual 22/03/2004
12.6.FLASH (IC 314)
12.6.1.General Description
The MT28F128J3 is a nonvolatile, electrically block-erasable (Flash), programmable memory
containing 134,217,728 bits organized as 16,777,218 bytes (8 bits) or 8,388,608 words (16 bits). This
128Mb device is organized as one hundred twenty-eight 128KB erase blocks.
The MT28F640J3 contains 67,108,864 bits organized as 8,388,608 bytes (8 bits) or 4,194,304 words
(16 bits). This 64Mb device is organized as sixty-four 128KB erase blocks.
Similarly, the MT28F320J3 contains 33,554,432 bits organized as 4,194,304 bytes (8 bits) or 2,097,152
words (16 bits). This 32Mb device is organized as thirty-two 128KB erase blocks.
These three devices feature in-system block locking. They also have common Flash interface (CFI) that
permits software algorithms to be used for entire families of devices. The software is device-
independent, JEDEC ID-independent with forward and backward compatibility.
Additionally, the scalable command set (SCS) allows a single, simple software driver in all host systems
to work with all SCS-compliant Flash memory devices. The SCS provides the fastest system/device
data transfer rates and minimizes the device and system-level implementation costs.
To optimize the processor-memory interface, the device accommodates VPEN, which is switchable
during block erase, program, or lock bit configuration, or hard-wired to VCC, depending on the
application. VPEN is treated as an input pin to enable erasing, programming, and block locking. When
VPEN is lower than the VCC lockout voltage (VLKO), all program functions are disabled. Block erase
suspend mode enables the user to stop block erase to read data from or program data to any other
blocks. Similarly, program suspend mode enables the user to suspend programming to read data or
execute code from any unsuspended blocks.
VPEN serves as an input with 2.7V, 3.3V, or 5V for application programming. VPEN in this Q-Flash _
family can provide data protection when connected to ground. This pin also enables program or erase
lockout during power transition.
Micron’s even-sectored Q-Flash devices offer individual block locking that can lock and unlock a block
using the sector lock bits command sequence.
Status (STS) is a logic signal output that gives an additional indicator of the internal state machine
(ISM) activity by providing a hardware signal of both status and status masking. This status indicator
minimizes central processing unit (CPU) overhead and system power consumption. In the default
mode, STS acts as an RY/BY# pin. When LOW, STS indicates that the ISM is performing a block
erase, program, or lock bit configuration. When HIGH, STS indicates that the ISM is ready for a new
command.
Three chip enable (CE) pins are used for enabling and disabling the device by activating the device’s
control logic, input buffer, decoders, and sense amplifiers.
BYTE# enables the device to be used in x8 or x16 read/write mode; BYTE# = 0 selects an 8-bit mode,
with address A0 selecting between the LOW and HIGH byte, while BYTE# = 1 selects a 16-bit mode.
When BYTE# = 1, A1 becomes the lowest-order address line with A0 being a no connect.
RP# is used to reset the device. When the device is disabled and RP# is at Vcc, the standby mode is
enabled. A reset time (t RWH) is required after RP# switches HIGH until outputs are valid. Likewise, the
device has a wake time (t RS) from RP# high until writes to the command user interface (CUI) are
recognized. When RP# is at GND, it provides write protection, resets the ISM, and clears the status
register.
A variant of the MT28F320J3 also supports the new security block lock feature for additional code
security. This feature provides an OTP function for the device. (Contact factory for availability.)
The MT28F320J3 and the MT28F640J3 are manufactured using the 0.18µm process technology, and
the MT28F128J3 is manufactured using the 0.15µm process technology.
12.6.2.Features
• x8/x16 organization
• One hundred twenty-eight 128KB erase blocks (128Mb)
Sixty-four 128KB erase blocks (64Mb)
Thirty-two 128KB erase blocks (32Mb)
•VCC, VCCQ, and VPEN voltages:
2.7V to 3.6V VCC operation
2.7V to 3.6V, or 5V VPEN application programming
• Interface Asynchronous Page Mode Reads:
150ns/25ns or 120ns/25ns read access time (128Mb)
120ns/25ns or 115ns/25ns read access time (64Mb)
110ns/25ns read access time (32Mb)
• Manufacturing ID (ManID)
Intel® (0x89h)