CD00237391 datasheet(138/177 Pages) STMICROELECTRONICS

138 / 177 page

Electrical characteristics

STM32F20xxx

138/177

Doc ID 15818 Rev 9

NAND controller waveforms and timings

Figure 68 through Figure 71 represent synchronous waveforms, together with Table 80 and

Table 81 provides the corresponding timings. The results shown in this table are obtained

with the following FSMC configuration:

●

COM.FSMC_SetupTime = 0x01;

●

COM.FSMC_WaitSetupTime = 0x03;

●

COM.FSMC_HoldSetupTime = 0x02;

●

COM.FSMC_HiZSetupTime = 0x01;

●

ATT.FSMC_SetupTime = 0x01;

●

ATT.FSMC_WaitSetupTime = 0x03;

●

ATT.FSMC_HoldSetupTime = 0x02;

●

ATT.FSMC_HiZSetupTime = 0x01;

●

Bank = FSMC_Bank_NAND;

●

MemoryDataWidth = FSMC_MemoryDataWidth_16b;

●

ECC = FSMC_ECC_Enable;

●

ECCPageSize = FSMC_ECCPageSize_512Bytes;

●

TCLRSetupTime = 0;

●

TARSetupTime = 0;

In all timing tables, the THCLK is the HCLK clock period.

Table 79.

Switching characteristics for PC Card/CF read and write cycles in I/O space(1)(2)

Symbol

Parameter

Min

Max

Unit

tw(NIOWR)

FSMC_NIOWR low width

8THCLK - 0.5

tv(NIOWR-D)

FSMC_NIOWR low to FSMC_D[15:0] valid

5THCLK- 1

th(NIOWR-D)

FSMC_NIOWR high to FSMC_D[15:0] invalid

8THCLK- 3

td(NCE4_1-NIOWR) FSMC_NCE4_1 low to FSMC_NIOWR valid

5THCLK+ 1.5

th(NCEx-NIOWR)

FSMC_NCEx high to FSMC_NIOWR invalid

5THCLK

-ns

td(NIORD-NCEx)

FSMC_NCEx low to FSMC_NIORD valid

5THCLK+ 1

th(NCEx-NIORD)

FSMC_NCEx high to FSMC_NIORD) valid

5THCLK– 0.5

tw(NIORD)

FSMC_NIORD low width

8THCLK+ 1

tsu(D-NIORD)

FSMC_D[15:0] valid before FSMC_NIORD

high

9.5

td(NIORD-D)

FSMC_D[15:0] valid after FSMC_NIORD high

CL = 30 pF.

Based on characterization, not tested in production.

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