User guide

LogiCORE IP Block Memory Generator v6.1
80 www.xilinx.com DS512 March 1, 2011
Product Specification
Aspect Ratios
The Block Memory Generator selectable port and data width aspect ratios may increase block RAM
usage and affect performance, because aspect ratios limit the primitive types available to the algorithm,
which can reduce packing efficiency. Large aspect ratios, such as 1:32, have a greater impact than small
aspect ratios. Note that width and depth are reported with respect to the port A Write interface.
1. LUTs are reported as the number of 4-input LUTs, and do not reflect the number of LUTs used as a route-through.
Table 29: Spartan-6 Device Output Register Examples
Memory
Type
Width x
Depth
Output
Register
Options
Block RAM
Shift
Regs
FFs LUTs
(1)
1. LUTs are reported as the number of 4-input LUTs, and do not reflect the number of LUTs used as a route-through.
Performance
(MHz)
36K 16K 8K
Single-port
RAM
17x5k
0500 3 19 175
Primitive 0 5 0 3 3 19 250
Core 0 5 0 0 20 19 175
Primitive, Core 0 5 0 3 20 19 225
Tru e
Dual-port
RAM
17x5k
0500 6 38 175
Primitive 0 5 0 4 6 38 250
Core 0 5 0 0 40 38 175
Primitive, Core 0 5 0 4 40 38 225
Table 30: Virtex-6 Device Aspect Ratio
Memory
Type
Width x
Depth
Data Width
Aspect Ratio
Block RAMs
Shift Regs FFs LUTs
(1)
1. LUTs are reported as the number of 4-input LUTs, and do not reflect the number of LUTs used as a route-through.
Performance
(MHz)
36K 16K 8K
Single-port
RAM
17x5k
1:1 2 3 0 0 6 36 300
1:8
(2)
2. Read port is 136x640; Write port is 17x5k.
8 1 0 0 0 0 275
Table 31: Virtex-5 Device Aspect Ratio
Memory
Type
Width x
Depth
Data Width
Aspect Ratio
Block RAMs
Shift Regs FFs LUTs
(1)
1. LUTs are reported as the number of 4-input LUTs, and do not reflect the number of LUTs used as a route-through.
Performance
(MHz)
36K 16K 8K
Single-port
RAM
17x5k
1:1 2 3 0 0 6 36 300
1:8
(2)
2. Read port is 136x640; Write port is 17x5k.
8 1 0 0 0 0 275
Table 32: Virtex-4 Device Aspect Ratio
Memory
Type
Width x Depth
Data Width
Aspect Ratio
Block RAM
16K
Shift
Regs
FFs LUTs
(1)
1. LUTs are reported as the number of 4-input LUTs, and do not reflect the number of LUTs used as a route-through.
Performance (MHz)
Single
Port
17x5k
1:1 5 0 6 60 275
1:8
(2)
9000 275