S29CD032J datasheet(34/81 Pages) SPANSION

34 / 81 page

S29CD-J and S29CL-J Flash Family

S29CD-J_CL-J_00_B7 October 11, 2012

Da ta

Sh e e t

Figure 8.6 Erase Operation

Notes

1. See Command Definitions on page 75 for erase command sequence.

2. See DQ3: Sector Erase Timer on page 42 for more information.

8.7.4

Erase Suspend / Erase Resume Commands

The Erase Suspend command allows the system to interrupt a sector erase operation and then read data

from, or program data to, any sector not selected for erasure. When the Erase Suspend command is written

during the sector erase time-out, the device immediately terminates the time-out period and suspends the

erase operation. The bank address is required when writing this command. This command is valid only during

the sector erase operation, including the minimum 80-µs time-out period during the sector erase command

sequence. The Erase Suspend command is ignored if written during the chip erase operation.

When the Erase Suspend command is written after the 80-µs time-out period has expired and during the

sector erase operation, the device takes 20 µs maximum to suspend the erase operation.

After the erase operation has been suspended, the bank enters the erase-suspend-read mode. The system

can read data from or program data to any sector that is not selected for erasure. (The device “erase

suspends” all sectors selected for erasure.) Note that when the device is in the Erase Suspend mode, the

Reset command is not required for read operations and is ignored.

Further nesting of erase operation is not permitted. Reading at any address within erase suspended sectors

produces status information on DQ7-DQ0. The system can use DQ6 and DQ2 together, to determine if a

sector is actively erasing or is erase-suspended. Refer to Table 8.8 on page 40 for information on these

status bits.

A read operation from the erase-suspended bank returns polling data during the first 8 µs after the erase

suspend command is issued; read operations thereafter return array data. Read operations from the other

bank return array data with no latency.

After an erase-suspended program operation is complete, the bank returns to the erase-suspend read mode.

The system can determine the status of the program operation using the DQ7, DQ6, and/or RY/BY# status

bits, just as in the standard program operation.

To resume the sector erase operation, the system must write the Erase Resume command. The bank

address of the erase-suspended bank is required when writing this command. Further writes of the Resume

command are ignored. Another Erase Suspend command can be written after the chip has resumed erasing.

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

S29CD032J Datasheet(PDF) 34 Page - SPANSION

S29CD032J Datasheet(HTML) 34 Page - SPANSION

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

Datasheet Download

Link URL