S29CD-G datasheet(50/87 Pages) SPANSION

Part #	S29CD-G

Description	32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O

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S29CD-G Flash Family

S29CD-G_00_B0 November 14, 2005

Prel imi n ary

Notes:

1.See Table 41 and Table 42 for erase command sequence.

2.See DQ3: Sector Erase Timer for more information.

Figure 5. Erase Operation

Erase Suspend mode, the Reset command is not required for read operations and is ignored) or

program operations in sectors not being erased. Any other command written during the Erase

Suspend mode is ignored, except for the Sector Erase and Program Resume command. Writing

the Erase and Program Resume command resumes the sector erase operation. The bank address

of the erase suspended bank is required when writing this command

If the Sector Erase and Program Suspend command is written during a programming operation,

the device suspends programming operations and allows only read operations in sectors not se-

lected for programming. Further nesting of either erase or programming operations is not

permitted. Table 40 summarizes permissible operations during Erase and Program Suspend. (A

busy sector is one that is selected for programming or erasure.):

When the Sector Erase and Program Suspend command is written during a Sector Erase opera-

tion, the chip takes between 0.1 µs and 20 µs to actually suspend the operation and go into the

erase suspended read mode (pseudo-read mode), at which time the user can read or program

from a sector that is not erase suspended. Reading data in this mode is the same as reading from

the standard read mode, except that the data must be read from sectors that were not erase

suspended.

Polling DQ6 on two immediately consecutive reads from a given address provides the system with

the ability to determine if the device is in Erase or Program Suspend. Before the device enters

Erase or Program Suspend, the DQ6 pin toggles between two immediately consecutive reads from

the same address. After the device enters Erase suspend, DQ6 stops toggling between two im-

Table 40. Allowed Operations During Erase/Program Suspend

Sector

Program Suspend

Erase Suspend

Busy Sector

Program Resume

Erase Resume

Non-busy sectors

Read Only

Read or Program

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

No

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

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