MBM29DL800BA-70 Просмотр технического описания (PDF) - Spansion Inc.

Номер в каталоге

Компоненты Описание

производитель

MBM29DL800BA-70

8M (1M X 8/512K X 16) BIT

Spansion Inc. 

MBM29DL800TA-70/90/MBM29DL800BA-70/90

Automatic Sleep Mode

There is a function called automatic sleep mode to restrain power consumption during read-out of

MBM29DL800TA/BA data. This mode can be used effectively with an application requested low power

consumption such as handy terminals.

To activate this mode, MBM29DL800TA/BA automatically switch themselves to low power mode when

MBM29DL800TA/BA addresses remain stably during access fine of 150 ns. It is not necessary to control CE,

WE, and OE on the mode. Under the mode, the current consumed is typically 1 µA (CMOS Level).

During simultaneous operation, VCC active current (ICC2) is required.

Since the data are latched during this mode, the data are read-out continuously. If the addresses are changed,

the mode is canceled automatically and MBM29DL800TA/BA read-out the data for changed addresses.

Output Disable

With the OE input at a logic high level (VIH), output from the devices are disabled. This will cause the output pins

to be in a high impedance state.

Autoselect

The autoselect mode allows the reading out of a binary code from the devices and will identify its manufacturer

and type. This mode is intended for use by programming equipment for the purpose of automatically matching

the devices to be programmed with its corresponding programming algorithm. This mode is functional over the

entire temperature range of the devices.

To activate this mode, the programming equipment must force VID (11.5 V to 12.5 V) on address pin A9. Two

identifier bytes may then be sequenced from the devices outputs by toggling address A0 from VIL to VIH. All

addresses are DON’T CARES except A0, A1, and A6 (A-1). (See “MBM29DL800TA/BA User Bus Operations

Tables (BYTE = VIH and BYTE = VIL)” in sDEVICE BUS OPERATION.)

The manufacturer and device codes may also be read via the command register, for instances when the

MBM29DL800TA/BA are erased or programmed in a system without access to high voltage on the A9 pin. The

command sequence is illustrated in “MBM29DL800TA/BA Command Definitions Table” (in sDEVICE BUS

OPERATION). (Refer to Autoselect Command section.)

Word 0 (A0 = VIL) represents the manufacturer’s code (Fujitsu = 04h) and word 1 (A0 = VIH) represents the device

identifier code (MBM29DL800TA = 4Ah and MBM29DL800BA = CBh for ×8 mode; MBM29DL800TA = 224Ah

and MBM29DL800BA = 22CBh for ×16 mode). These two bytes/words are given in “MBM29DL800TA/BA Sector

Protection Verify Autoselect Codes Table” and “Extended Autoselect Code Table” (in sDEVICE BUS

OPERATION). All identifiers for manufactures and device will exhibit odd parity with DQ7 defined as the parity

bit. In order to read the proper device codes when executing the autoselect, A1 must be VIL. (See

“MBM29DL800TA/BA Sector Protection Verify Autoselect Codes Table” and “Extended Autoselect Code Table”

in sDEVICE BUS OPERATION.)

In case of applying VID on A9, since both Bank 1 and Bank 2 enters Autoselect mode, the simultenous operation

can not be executed.

Write

Device erasure and programming are accomplished via the command register. The contents of the register serve

as inputs to the internal state machine. The state machine outputs dictate the function of the device.

The command register itself does not occupy any addressable memory location. The register is a latch used to

store the commands, along with the address and data information needed to execute the command. The

command register is written by bringing WE to VIL, while CE is at VIL and OE is at VIH. Addresses are latched on

the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE,

whichever happens first. Standard microprocessor write timings are used.

Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.

15

Share Link: