MX29LV400CBTC-70G Macronix, MX29LV400CBTC-70G Datasheet - Page 19

• Manufacturer Part Number: MX29LV400CBTC-70G
• Description: MX29LV Series 3 V 4 Mb (524k x 8/256k x 16) 70 ns Parallel Flash - TSOP-48
• Manufacturer: Macronix

WRITE COMMANDS/COMMAND SEQUENCES
To write a command to the device, system must drive WE# and CE# to Vil, and OE# to Vih. In a command cycle,
all address are latched at the later falling edge of WE#, and all data are latched at the earlier rising edge of
WE#.
Figure 1 illustrates the AC timing waveform of a write command, and Table 3 defines all the valid command sets
of the device. System is not allowed to write invalid commands not defined in this datasheet. Writing an invalid
command will bring the device to an undefined state.
REQUIREMENTS FOR READING ARRAY DATA
Read array action is to read the data stored in the array. While the memory device is in powered up or has been
reset, it will automatically enter the status of read array. If the microprocessor wants to read the data stored in
array, it has to drive CE# (device enable control pin) and OE# (Output control pin) as Vil, and input the address
of the data to be read into address pin at the same time. After a period of read cycle (Tce or Taa), the data being
read out will be displayed on output pin for microprocessor to access. If CE# or OE# is Vih, the output will be in
tri-state, and there will be no data displayed on output pin at all.
After the memory device completes embedded operation (automatic Erase or Program), it will automatically re-
turn to the status of read array, and the device can read the data in any address in the array. In the process of
erasing, if the device receives the Erase suspend command, erase operation will be stopped temporarily after a
period of time no more than Tready1 and the device will return to the status of read array. At this time, the device
can read the data stored in any address except the sector being erased in the array. In the status of erase sus-
pend, if user wants to read the data in the sectors being erased, the device will output status data onto the out-
put. Similarly, if program command is issued after erase suspend, after program operation is completed, system
can still read array data in any address except the sectors to be erased
The device needs to issue reset command to enable read array operation again in order to arbitrarily read the
data in the array in the following two situations:
1. In program or erase operation, the programming or erasing failure causes Q5 to go high.
2. The device is in auto select mode or CFI mode.
In the two situations above, if reset command is not issued, the device is not in read array mode and system
must issue reset command before reading array data.
P/N:PM1300
19
MX29LV400C T/B
MX29LV800C T/B
MX29LV160C T/B
REV. 2.6, DEC. 22, 2011