Altera External Memory PHY Interface Uživatelský manuál stáhnout pdf (Strana 40)

3–24 Chapter 3: Functional Description—ALTMEMPHY (nonAFI)

ALTMEMPHY Signals

External Memory PHY Interface (ALTMEMPHY) (nonAFI) Megafunction User Guide © January 2010 Altera Corporation

Table 3–16 shows the parameters that Table 3–11 through Table 3–15 refer to.

Table 3–16. Parameters

Parameter Name Description

DBG_A_WIDTH —

DQS_DELAY_CTL_WIDTH —

DWIDTH_RATIO The data width ratio from the local interface to the memory interface.

DWIDTH_RATIO of 2 means full rate, while DWIDTH_RATIO of 4 means half rate.

LOCAL_IF_DWIDTH The width of the local data bus must be quadrupled for half-rate and doubled for

full-rate.

MEM_IF_DWIDTH The data width at the memory interface. MEM_IF_DWIDTH can have values that are

multiples of MEM_IF_DQ_PER_DQS.

MEM_IF_DQS_WIDTH The number of DQS pins in the interface.

MEM_IF_ROWADDR_WIDTH The row address width of the memory device.

MEM_IF_BANKADDR_WIDTH The bank address with the memory device (not used in QDR II+/QDR II SRAM

variations).

MEM_IF_CS_WIDTH The number of chip select pins in the interface. The sequencer only calibrates one chip

select pin.

MEM_IF_DM_WIDTH The number of mem_dm pins on the memory interface.

MEM_IF_DQ_PER_DQS The number of mem_dq[] pins per mem_dqs pin.

MEM_IF_CLK_PAIR_COUNT The number of mem_clk/mem_clk_n pairs in the interface.

READ_LAT_WIDTH The bus width for the ctl_rlat signal, used in QDR II+/QDR II SRAM PHY, that

determines the read latency of your system.

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Altera External Memory PHY Interface Uživatelský manuál Strana 40