Altera External Memory PHY Interface Manuel d'utilisateur télécharger pdf (Page 25)

Chapter 3: Functional Description—ALTMEMPHY (nonAFI) 3–9

ALTMEMPHY Signals

This section describes the ALMEMPHY megafunction signals for the following

interfaces:

■ DDR2 and DDR SDRAM signals

■ QDR II+ and QDR II SRAM signals

DDR2 and DDR SDRAM Signals

Table 3–1 through Table 3–10 show the signals for DDR2 and DDR SDRAM nonAFIs.

The signal lists include the following signal groups:

■ I/O interface to the external memory device

■ Clock and reset signals

■ PLL reconfiguration signals

■ External DLL signals

■ User-mode calibrated on-chip termination (OCT) control signals

■ Interface to the memory controller

■ Local interface signals

■ Datapath interface for the controller

■ ALTMEMPHY megafunction calibration status interface

■ Additional calibration signals from the sequencer

1 Ports with the prefix “mem_” connect the PHY with the memory device; ports with the

prefix “ctl_” connect the PHY with the controller. Ports with prefix “ctl_mem_”

indicate the datapath for the controller; ports with the prefix “local_” indicate the

signal to be connected with the example driver or user logic.

1 Signals with suffix _n are active low; signals without suffix _n are active high.

Table 3–1. I/O Interface for DDR2 and DDR SDRAM—nonAFI (Note 1) (Part 1 of 2)

Signal Name Type Width Description

mem_addr output MEM_IF_ROWADDR_WIDTH The memory row and column address bus.

mem_ba output MEM_IF_BANKADDR_WIDTH The memory bank address bus.

mem_cas_n output 1 The memory column address strobe.

mem_cke output MEM_IF_CS_WIDTH The memory clock enable.

mem_clk bidir MEM_IF_CLK_PAIR_COUNT The memory clock, positive edge clock. (2)

mem_clk_n bidir MEM_IF_CLK_PAIR_COUNT The memory clock, negative edge clock. (2)

mem_cs_n output MEM_IF_CS_WIDTH The memory chip select signal.

mem_dm output MEM_IF_DM_WIDTH The optional memory data mask bus.

mem_dq bidir MEM_IF_DWIDTH The memory bidirectional data bus.

mem_dqs bidir MEM_IF_DWIDTH /

MEM_IF_DQ_PER_DQS

The memory bidirectional data strobe bus.

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Altera External Memory PHY Interface Manuel d'utilisateur Page 25