Digilent DDR-2 Opus Card Manual de usuario descargar pdf (Pagina 16)

Opus Card – DDR-2 Interface

Reference Manual

12/03/2010 07:35 AM 16

3.3 Waveforms

3.3.1 Non-burst, 32-bit Memory Read Clock-Aligned

The timing diagram below is for a non-burst, 32-bit memory read where Rd_Data_Valid aligns

with the rising edge of Bus2IP_Clk.

1 2 3 4 5 6 7 8 9 10 11 12

Read

Address

Word1 Wo rd 2

32-bit Data

Address

Idle Wait_RdValid Rd_Align IdleWait_RdVali d Rd_Ack1 Rd_Ack2

Signals below are from write_ctrl

TimeGen

DDR2_Clk

Bus2IP_Clk

Bus2IP_CS

Bus2IP_RNW

Bus2IP_Addr

Bus2IP_RdReq

IP2Bus_Data

Rd_Send_Cmd

Rd_Send_Ack

Rd_Data_Valid

Rd_Data_FIFO_Out

State

IP2Bus_AddrAck

IP2Bus_RdAck

App_AF_WREn

App_AF_Cmd

App_AF_Addr

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22

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Digilent DDR-2 Opus Card Manual de usuario Pagina 16