SPEAR600 datasheet(77/97 Pages) STMICROELECTRONICS

77 / 97 page

SPEAr600

Timing characteristics

Doc ID 16259 Rev 3

77/97

Figure 26.

Output address signal waveforms for 8-bit NAND Flash configuration

Figure 27.

In/out data address signal waveforms for 8-bit NAND Flash configuration

Table 48.

Timing characteristics for 8-bit NAND Flash configuration

Parameter

Min

Max

TCLE

-16.85 ns

-19.38 ns

TALE

-16.84 ns

-19.37 ns

TWE (s=1)(1)

TWE e TRE are the timings between the falling edge of NFCE and the once related to NFWE and NFRE,

respectively. Both are composed by the algebric sum of a fixed part (due to the internal delays of Spear)

and a programmable one in a FSMC register. The programmable one is equal to (s+1)*Thclk where

s=Tset. The values shown in the table are calculated using s=1

11.10 ns

13.04 ns

TRE (s=1)(1)

11.18 ns

13.05 ns

TIO (h=1)(2)

TIO is the timing between the falling edge of NFCE and the first or the last change of NFIO depending on

the min or the max timing. It's composed by the algebric sum of a fixed part (due to the internal delays of

Spear) and a programmable one in a FSMC register. The programmable one is equal to h*Thclk where

h=Thiz. The values shown in the table are calculated using h=1.

TREAD is the timing between the falling edge and the rising edge of NFRE. This value is fully

programmable and it's equal to

T(read) = (w+1)*T(hclk) >= T(re->io) + T(nfio->FFs)

where w=Twait; T(re->io) is the output delay of the NAND Flash and T(nfio->FFs) is the SPEAr600 internal

delay (~9 ns).

3.43 ns

8.86 ns

NFALE

NFCE

NFWE

NFIO

Address

TALE

TWE

TIO

NFCE

NFWE

NFIO (out)

Data Out

TIO

NFIO (in)

NFRE

TRE -> IO

TWE

TRE

TREAD

TNFIO -> FFs

(3)

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