PC48F4400PCQB0 datasheet(61/102 Pages) NUMONYX

61 / 102 page

November 2007

Datasheet

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

The 12-V VPP mode enhances programming performance during the short time period

typically found in manufacturing processes; however, it is not intended for extended

use.12 V may be applied to VPP during program and erase operations as specified in

Section 5.0, “Maximum Ratings and Operating Conditions” on page 21. VPP may be

connected to 12 V for a total of tPPH hours maximum. Stressing the device beyond

these limits may cause permanent damage.

11.3

Enhanced Factory Program (EFP)

EFP substantially improves device programming performance through a number of

enhancements to the conventional 12 Volt word program algorithm. EFP's more

efficient WSM algorithm eliminates the traditional overhead delays of the conventional

word program mode in both the host programming system and the flash device.

Changes to the conventional word programming flowchart and internal WSM routine

were developed because of today's beat-rate-sensitive manufacturing environments; a

balance between programming speed and cycling performance was attained.

The host programmer writes data to the device and checks the Status Register to

determine when the data has completed programming. This modification essentially

cuts write bus cycles in half. Following each internal program pulse, the WSM

increments the device's address to the next physical location. Now, programming

equipment can sequentially stream program data throughout an entire block without

having to setup and present each new address. In combination, these enhancements

reduce much of the host programmer overhead, enabling more of a data streaming

approach to device programming.

EFP further speeds up programming by performing internal code verification. With this,

PROM programmers can rely on the device to verify that it has been programmed

properly. From the device side, EFP streamlines internal overhead by eliminating the

delays previously associated to switch voltages between programming and verify levels

at each memory-word location.

EFP consists of four phases: setup, program, verify and exit. Refer to Figure 27,

“Enhanced Factory Program Flowchart” on page 64 for a detailed graphical

representation of how to implement EFP.

11.3.1

EFP Requirements and Considerations

EFP Requirements

Ambient temperature: TA = 25 °C ± 5 °C

VCC within specified operating range

VPP within specified VPP2 range

Target block unlocked

EFP Considerations

Block cycling below 100 erase cycles 1

RWW not supported2

EFP programs one block at a time

EFP cannot be suspended

Notes:

Recommended for optimum performance. Some degradation in performance may occur if this limit is

exceeded, but the internal algorithm will continue to work properly.

Code or data cannot be read from another partition during EFP.

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