Atmel ATEVK525 Betriebsanweisung PDF herunterladen (Seite 10)

Using the ATEVK525

2-10 ATEVK525 Mass Storage Board for AVR

7740B–AVR–03/08

NF Module Installation Figure 2-5 . NAND Flash module on the ATEVK525, plus MMC card

When using the NAND Flash module, the following pin assignments do not change :

Data/Address bus, CLE, ALE, RE#, WE#, WP# (Write Protect feature drives all the

chips at the same time). Other signal assignments are grouped in the following table.

Table 2-4 . NAND Flash module pin assignment

Note: 1. When using the additional module, the resistor R10 must be unsoldered, else

the CE# lines of the NAND Flash soldered and the NAND Flash #0 of the mod-

ule will be connected together (not applicable if NF #0 is not mounted on the

module)

2. When using the additional module, check that the configuration pads that enable

CTS/RTS lines on STK525 are not soldered, because these signals are also con-

nected to the R/B#2 & 3. But if CTS/RTS lines are required, you cannot use the

R/B#2 & 3 signals, so disable the configuration pads CP1 & CP2 of the ATEVK525.

NAND Flash Microcontroller Function

CE0# PORTC2 (A10) Chip select for chip 0 (active low, on-board pull-up)

CE1# PORTC3 (A11) Chip select for chip 1 (active low, on-board pull-up)

CE2# PORTC4 (A12) Chip select for chip 2 (active low, on-board pull-up)

CE3# PORTC5 (A13) Chip select for chip 3 (active low, on-board pull-up)

R/B0# PORTC6 Ready / Busy# for chip 0 (pull-up to enable in micro)

R/B1# PORTC7 Ready / Busy# for chip 1 (pull-up to enable in micro)

R/B2# PORTD0 Ready / Busy# for chip 2 (pull-up to enable in micro)

R/B3# PORTD1 Ready / Busy# for chip 3 (pull-up to enable in micro)

See Note 1

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Atmel ATEVK525 Betriebsanweisung Seite 10