Specifications

February 2015 IS29GL_128S_01GS_00_Rev.A GL-S MirrorBit

Family 39

Data Sheet

5.4.2.1 DQ7: Data# Polling

The Data# Polling bit, DQ7, indicates to the host system whether an Embedded Algorithm is in progress or

has completed. Data# Polling is valid after the rising edge of the final WE# pulse in the program or erase

command sequence. Note that the Data# Polling is valid only for the last word being programmed in the write-

buffer-page during Write Buffer Programming. Reading Data# Polling status on any word other than the last

word to be programmed in the write-buffer-page will return false status information.

During the Embedded Program algorithm, the device outputs on DQ7 the complement of the data bit

programmed to DQ7. This DQ7 status also applies to programming during Erase Suspend. When the

Embedded Program algorithm is complete, the device outputs the data bit programmed to bit 7 of the last

word programmed. In case of a Program Suspend, the device allows only reading array data. If a program

address falls within a protected sector, Data# Polling on DQ7 is active for approximately 20 µs, then the

device returns to reading array data.

During the Embedded Erase or Blank Check algorithms, Data# Polling produces a 0 on DQ7. When the

algorithm is complete, or if the device enters the Erase Suspend mode, Data# Polling produces a 1 on DQ7.

This is analogous to the complement / true datum output described for the Embedded Program algorithm: the

erase function changes all the bits in a sector to 1; prior to this, the device outputs the complement or '0'. The

system must provide an address within the sector selected for erasure to read valid status information on

DQ7.

After an erase command sequence is written, if the sector selected for erasing is protected, Data# Polling on

DQ7 is active for approximately 100 µs, then the device returns to reading array data.

When the system detects DQ7 has changed from the complement to true data, it can read valid data at

DQ15-DQ0 on the following read cycles. This is because DQ7 may change asynchronously with DQ6-DQ0

while Output Enable (OE#) is asserted Low. This is illustrated in Figure 10.16 on page 88. Table 5.3

on page 42 shows the outputs for Data# polling on DQ7. Figure 5.2 on page 29 shows the Data# polling

algorithm use in Write Buffer Programming.

Valid DQ7 data polling status may only be read from:

 the address of the last word loaded into the Write Buffer for a Write Buffer programming operation;

 the location of a single word programming operation;

 or a location in a sector being erased or blank checked;

 or a location in any sector during chip erase.

Figure 5.5 Data# Polling Algorithm

Note:

1. DQ7 should be rechecked even if DQ5 = 1 because DQ7 may change simultaneously with DQ5.

START

Read DQ7 -DQ0-

FAIL

DQ7 = Data?

Yes

DQ5 = 1?

Yes

DQ7 = Data?

Yes

PASS

Read DQ7 -DQ0