S71WS512N Datasheet, PDF(3/18 Page) SPANSION – Migrating from the S71WS512N to the S71WS512P

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S71WS512N Datasheet, PDF (3/18 Pages) SPANSION – Migrating from the S71WS512N to the S71WS512P

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Application Note

VCC and VCCQ Ramp

On the WS512P, VCC and VCCQ (VIO) must ramp up simultaneously. This restriction is not required on the

S71WS512N. Regarding VCC ramp rates, the WS512P places no restriction on VCC; (Some earlier revisions

of the WS256N required the ramp rate to be greater than 1 V/100 Âµs, or a RESET pulse would have to be

issued.

Table 3.1 shows parameters that have been changed in the S29WS512P.

Parameter

tVCS

tRPH

Table 3.1 VCC / RESET# / CE# Timing Parameter Comparison

Description

VCC Setup Time

RESET# Low to CE# Low

S29WS256N

1 ms

N/A

S29WS512P

30 Âµs

10 Âµs

4. Basic Architectural Changes

4.1 Sector Architecture

Both the S29WS256N and the S29WS512P feature sectors of the same size, that is, 128 KB sectors and the

smaller 32 KB (boot) sectors. However, the S71WS512N contains a total of 16 small flash sectors, while the

S71WS512P contains only 8 small flash sectors. Figure 4.1 illustrates this.

Figure 4.1 Flash Sector Architecture of the S71WS256N and S71WS512P

S71WS256N

S71WS512P

32KB

254

128KB sectors

32KB

510

128KB sectors

254

128KB sectors

32KB

October 3, 2006 2xWS-N_to_WS-P_AN_01E

S71WS512N to S71WS512P

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