S29CD032G datasheet(67/93 Pages) SPANSION

부품명	S29CD032G

상세설명	CMOS 2.5 VOLT ONLY BURST MODE DUAL BOOT, SIMULTANEOUS READ /WRITE FLASH MEMORY

PDF	93 Pages

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67 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

The remaining scenario is that the system initially determines that the toggle bit

is toggling and DQ5 has not gone high. The system may continue to monitor the

toggle bit and DQ5 through successive read cycles, determining the status as de-

scribed in the previous paragraph. Alternatively, it may choose to perform other

system tasks. In this case, the system must start at the beginning of the algo-

rithm when it returns to determine the status of the operation (top of Figure 7).

START

Yes

DQ5 = 1?

Yes

DQ6 = Toggle?

Read Byte

(DQ0-DQ7)

Address = VA

DQ6 = Toggle?

Read Byte Twice

(DQ 0-DQ7)

Adrdess = VA

Read Byte

(DQ0-DQ7)

Address = VA

FAIL

PASS

Notes:

1. Read toggle bit with two immediately consecutive reads to determine whether or not it is toggling. See text.

2. Recheck toggle bit because it may stop toggling as DQ5 changes to “1”. See text.

Figure 7. Toggle Bit Algorithm

(Note 1)

(Notes

1, 2)

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