PC48F4400PLVB0 datasheet(60/102 Pages) NUMONYX

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Numonyx™ Wireless Flash Memory (W18)

Datasheet

November 2007

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

11.2

Factory Programming

The standard factory programming mode uses the same commands and algorithm as

the Word Program mode (40h/10h). When VPP is at VPP1, program and erase currents

are drawn through VCC. If VPP is driven by a logic signal, VPP1 must remain above the

VPP1Min value to perform in-system flash modifications. When VPP is connected to a

12 V power supply, the device draws program and erase current directly from VPP. This

eliminates the need for an external switching transistor to control the VPP voltage.

Figure 35, “Examples of VPP Power Supply Configurations” on page 77 shows examples

of flash power supply usage in various configurations.

Figure 26: Word Program Flowchart

Suspend

Program

Loop

Start

Write 40h,

Word Address

Write Data

Word Address

Read Status

SR[7] =

Full Program

Status Check

(if desired)

Program

Complete

FULL PROGRAM STATUS CHECK PROCEDURE

Suspend

Program

Read Status

Program

Successful

SR[3] =

SR[1] =

SR[4] =

Yes

PP Range

Error

Device

Protect Error

Program

Error

WORD PROGRAM PROCEDURE

SR[3] MUST be cleared before the WSM will allow further

program attempts

Only the Clear Staus Register command clears SR[4:3,1].

If an error is detected, clear the status register before

attempting a program retry or other error recovery.

Standby

Bus

Operation

Command

Check SR[3]

1 = V

PP error

Check SR[4]

1 = Data program error

Comments

Repeat for subsequent programming operations.

Full status register check can be done after each program or

after a sequence of program operations.

Comments

Bus

Operation

Command

Data = 40h

Addr = Location to program (WA)

Write

Program

Setup

Data = Data to program (WD)

Addr = Location to program (WA)

Write

Data

Read SRD

Toggle CE# or OE# to update SRD

Read

Check SR[7]

1 = WSM ready

0 = WSM busy

Standby

Check SR[1]

1 = Attempted program to locked block

Program aborted

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