AM29BDD160G datasheet(40/79 Pages) AMD

40 / 79 page

Am29BDD160G

June 7, 2006

Figure 5 illustrates the Embedded™ Erase Algorithm,

using a typical command sequence and bus operation.

Refer to the Erase/Program Operations tables in the

AC Characteristics section for parameters, and to Fig-

ure 22 for timing diagrams.

Sector Erase and Program Suspend

Command

The Sector Erase and Program Suspend command al-

lows the user to interrupt a Sector Erase or Program

operation and perform data read or programs in a sec-

tor that is not being erased or to the sector where a

programming operation was initiated. This command

is applicable only during the Sector Erase and Pro-

gramming operation, which includes the time-out pe-

riod for Sector Erase.

Sector Erase and Program Suspend

Operation Mechanics

■ A successful erase pulse has a duration or 1.2 ms

± 20%, depending on the number of previous erase

cycles (among other factors).

■ A successful sector erase operation requires 300

successful erase pulses.

■ An internal counter monitors the number of erase

pulses initiated and has a maximum value of 5980.

The counter is incremented by one every time an

erase pulse is initiated, regardless of whether or not

that erase pulse is successful. An erase pulse is ter-

minated immediately when the suspend command

is executed. A new erase pulse is initiated when the

resume command is executed (and the counter is

incremented).

■ Given that 300 successful erase pulses are re-

quired, a successful sector erase operation shall

have a maximum of 5680 erase suspends.

The Sector Erase and Program Suspend command is

ignored if written during the execution of the Chip

Erase operation or Embedded Program Algorithm (but

will reset the chip if written improperly during the com-

mand sequences). Writing the Sector Erase and Pro-

gram command during the Sector Erase time-out

results in immediate termination of the time-out period

and suspension of the erase operation. Once in Erase

Suspend, the device is available for reading (note that

in the Erase Suspend mode, the Reset command is

not required for read operations and is ignored) or pro-

gram operations in sectors not being erased. Any

other command written during the Erase Suspend

mode is ignored, except for the Sector Erase and Pro-

gram Resume command. Writing the Erase and Pro-

gram 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 selected for program-

ming. Further nesting of either erase or programming

operations is not permitted. Table 18 summarizes per-

missible operations during Erase and Program Sus-

pend. (A busy sector is one that is selected for

programming or erasure.):

Table 18.

Allowed Operations During

Erase/Program Suspend

When the Sector Erase and Program Suspend com-

mand is written during a Sector Erase operation, the

chip will take between 0.1 µs and 20 µs to actually

suspend the operation and go into the erase sus-

pended 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 have not

been erase suspended.

Polling DQ6 on two immediately consecutive reads

from a given address provides the system with the

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

Notes:

1. See Tables 18 and 20 for erase command sequence.

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

Figure 5.

Erase Operation

Sector

Program Suspend

Erase Suspend

Busy Sector

Program Resume

Erase Resume

Non-busy

sectors

Read Only

Read or Program

AM29BDD160G 数据表(PDF) 40 Page - Advanced Micro Devices

AM29BDD160G 数据表(HTML) 40 Page - Advanced Micro Devices

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

数据表下载