CDPCLK4 datasheet(190/274 Pages) ALTERA

190 / 274 page

9–32

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

Figure 9–12 shows the recommended balanced star routing for multiple bus master

interfaces to minimize signal integrity issue.

Estimating the AP Configuration Time

AP configuration time is dominated by the time it takes to transfer data from the

parallel flash to the Cyclone III devices. This parallel interface is clocked by the

Cyclone III DCLK output (generated from an internal oscillator). As listed in Table 9–8

on page 9–14, the DCLK minimum frequency when using the 40-MHz oscillator is

20 MHz (50 ns). In word-wide cascade programming, the DATA[15..0] bus transfers a

16-bit word and essentially cuts configuration time to approximately 1/16 of the AS

configuration time. Therefore, the maximum configuration time estimation for an

EP3C40 device (9,600,000 bits of uncompressed data) is defined in Equation 9–4 and

Equation 9–5.

To estimate a typical configuration time, use the typical DCLK period listed in Table 9–8

on page 9–14. With a typical DCLK period of 33.33 ns, the typical configuration time is

20 ms.

Figure 9–12. Balanced Star Routing

Notes to Figure 9–12:

(1) Altera does not recommend M to exceed six inches as listed in Table 9–12 on page 9–30.

(2) Altera recommends using a balanced star routing. Try to keep the N length equal and as short as possible to minimize

reflection noise from the transmission line. The M length is applicable for this setup.

Equation 9–4.

Equation 9–5.

External

Master Device

Cyclone III

Master Device

Micron Flash

DCLK

M (1)

N (2)

Size

maximum DCLK period

16 bits per DCLK cycle

----------------------------------------------------------------







estimated maximum configuration ti

9,600,000 bits

50 ns

16 bits

-----------------







30 ms

CDPCLK4 Scheda tecnica(PDF) 190 Page - Altera Corporation

CDPCLK4 Scheda tecnica(HTML) 190 Page - Altera Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL