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`define SDR_REQ_ID_W       4

`define SDR_RFSH_TIMER_W    12

`define SDR_RFSH_ROW_CNT_W   3

// B2X Command

`define OP_PRE           2'b00

`define OP_ACT           2'b01

`define OP_RD            2'b10

`define OP_WR            2'b11

// SDRAM Commands (CS_N, RAS_N, CAS_N, WE_N)

`define SDR_DESEL        4'b1111

`define SDR_NOOP         4'b0111

`define SDR_ACTIVATE     4'b0011

`define SDR_READ         4'b0101

`define SDR_WRITE        4'b0100

`define SDR_BT           4'b0110

`define SDR_PRECHARGE    4'b0010

`define SDR_REFRESH      4'b0001

`define SDR_MODE         4'b0000

`define  ASIC            1'b1

`define  FPGA            1'b0

`define  TARGET_DESIGN   `FPGA

// 12 bit subtractor is not feasibile for FPGA, so changed to 6 bits

`define  REQ_BW    (`TARGET_DESIGN == `FPGA) ? 6 : 12   //  Request Width