NAND512R3A2C datasheet(20/51 Pages) STMICROELECTRONICS

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Device operations

NAND512-A2C

20/51

Figure 7.

Pointer operations for programming

6.2

Read Memory Array

Each operation to read the memory area starts with a pointer operation as shown in the

Section 6.1: Pointer operations. Once the area (main or spare) has been selected using the

Read A, Read B or Read C commands four bus cycles (for 512Mb and 1Gb devices) or

three bus cycles (for 128Mb and 256Mb devices) are required to input the address (refer to

Table 6 and Table 7) of the data to be read.

The device defaults to Read A mode after power-up or a Reset operation.

When reading the spare area addresses:

●

A0 to A3 (x8 devices)

●

A0 to A2 (x16 devices)

are used to set the start address of the spare area while addresses:

●

A4 to A7 (x8 devices)

●

A3 to A7 (x16 devices)

are ignored.

Once the Read A or Read C commands have been issued they do not need to be reissued

for subsequent read operations as the pointer remains in the respective area. However, the

Read B command is effective for only one operation, once an operation has been executed

in Area B the pointer returns automatically to Area A and so another Read B command is

required to start another read operation in Area B.

Once a read command is issued two types of operations are available: Random Read and

Page Read.

6.2.1

Random Read

Each time the command is issued the first read is Random Read.

ai07591

I/O

Address

Inputs

Data Input

10h

80h

Areas A, B, C can be programmed depending on how much data is input. Subsequent 00h commands can be omitted.

AREA A

00h

Address

Inputs

Data Input

10h

80h

00h

I/O

Address

Inputs

Data Input

10h

80h

Areas B, C can be programmed depending on how much data is input. The 01h command must be re-issued before each program.

AREA B

01h

Address

Inputs

Data Input

10h

80h

01h

I/O

Address

Inputs

Data Input

10h

80h

Only Areas C can be programmed. Subsequent 50h commands can be omitted.

AREA C

50h

Address

Inputs

Data Input

10h

80h

50h

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