Altera Nios Development Board Cyclone II Edition Manual de usuario descargar pdf (Pagina 21)

Altera Corporation Reference Manual 2–9

May 2007 Nios Development Board Cyclone II Edition

Board Components

The following pins on U74 have fixed connections, which restricts the

usable modes of operation:

■ MODE is pulled low to enable Linear Burst

■ ZZ is pulled low to leave the chip enabled

■ GLOBALW_n is pulled high to disable the global write

■ CE2 and CE3_n are wired high and low respectively to be enabled

and to make CE1_n the master chip enable

f See www.cypress.com for detailed information about the SSRAM chip.

DDR SDRAM

Chip (U63)

U63 is a Micron DDR SDRAM chip. Depending on the board revision, the

part number is MT46V16M16TG or MT46V16M16P-6T. The DDR

SDRAM pins are connected to the FPGA as shown in Table 2–7. Altera

provides a DDR SDRAM controller that allows a Nios II processor to

access the DDR SDRAM device as a large, linearly-addressable memory.

K9 88 GW_n ssram_gw_n

E5 89 CLK sram_clk

Table 2–6. SSRAM Pin Table (Continued)

FPGA Pin U74 Pin Pin Function Board Net Name

Table 2–7. DDR SDRAM Pin Table

FPGA Pin U63 Pin Board Net Name

R2 2 sdram_dq0

R3 4 sdram_dq1

R4 5 sdram_dq2

P7 7 sdram_dq3

P6 8 sdram_dq4

T2 10 sdram_dq5

T3 11 sdram_dq6

R6 13 sdram_dq7

W2 54 sdram_dq8

W1 56 sdram_dq9

U6 57 sdram_dq10

U7 59 sdram_dq11

U5 60 sdram_dq12

Y1 62 sdram_dq13

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 63 64

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Altera Nios Development Board Cyclone II Edition Manual de usuario Pagina 21