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28 www.xilinx.com 7 Series FPGAs Memory Resources
UG473 (v1.11) November 12, 2014
Chapter 1: Block RAM Resources
For cascadable block RAM using the RAMB36E1, the data width is one bit, and the address
bus is 16 bits [15:0]. The address bit 15 is only used in cascadable block RAM. For
non-cascading block RAM, connect High.
Data and address pin mapping is further described in the Additional RAMB18E1 and
RAMB36E1 Primitive Design Considerations section.
SDP mode port name mapping is listed in Table 1-13. Figure 1-6, page 20 shows the SDP
mode data flow.
Table 1-11: Port Aspect Ratio for RAMB36E1 (in TDP Mode)
Port Data Width Port Address Width Depth ADDR Bus
DI Bus
DO Bus
DIP Bus
DOP Bus
1 15 32,768 [14:0] [0] NA
2 14 16,384 [14:1] [1:0] NA
4 13 8,192 [14:2] [3:0] NA
9 12 4,096 [14:3] [7:0] [0]
18 11 2,048 [14:4] [15:0] [1:0]
36 10 1,024 [14:5] [31:0] [3:0]
1 (Cascade) 16 65536 [15:0] [0] NA
Table 1-12: Port Aspect Ratio for RAMB36E1 (in SDP Mode)
Port Data
Width
(1)
Alternate Port
Width
Port Address
Width
Depth ADDR Bus
DI Bus
DO Bus
DIP Bus
DOP Bus
64 1 15 32,768 [14:0] [0] NA
64 2 14 16,384 [14:1] [1:0] NA
64 4 13 8,192 [14:2] [3:0] NA
72 9 12 4,096 [14:3] [7:0] [0]
72 18 11 2,048 [14:4] [15:0] [1:0]
72 36 10 1,024 [14:5] [31:0] [3:0]
72 72 9 512 [14:6] [63:0] [7:0]
Notes:
1. Either the Read or Write port is a fixed width of x64 or x72.
Table 1-13: SDP Mode Port Name Mapping
RAMB18E1 in SDP Mode RAMB36E1 in SDP Mode
X36 Mode (Width = 36) X18 Mode (Width 18) X72 Mode (Width = 72) X36 Mode (Width 36)
DI[15:0] = DIADI[15:0] DI[15:0] = DIBDI[15:0] DI[31:0] = DIADI[31:0] DI[31:0] = DIBDI[31:0]
DIP[1:0] = DIPADI[1:0] DIP[1:0] = DIPBDIP[1:0] DIP[3:0] = DIPADI[3:0] DIP[3:0] = DIPBDIP[3:0]
DI[31:16] = DIBDI[15:0] DI[63:32] = DIBDI[31:0]
DIP[3:2] = DIPBDIP[1:0] DIP[7:4] = DIPBDIP[3:0]
DO[15:0] = DOADO[15:0] DO[15:0] = DOADO[15:0] DO[31:0] = DOADO[31:0] DO[31:0] = DOADO[31:0]
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