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EP2S180F1020C4 Datasheet, PDF (376/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1 | |||
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Memory Modes
The widest bit configuration of the M4K and M-RAM blocks in true dual-
port mode is as follows:
â 256 Ã 16-bit (Ã18-bit with parity) (M4K)
â 8K Ã 64-bit (Ã72-bit with parity) (M-RAM)
The 128 Ã 32-bit (Ã36-bit with parity) configuration of the M4K block and
the 4K Ã 128-bit (Ã144-bit with parity) configuration of the M-RAM block
are unavailable because the number of output drivers is equivalent to the
maximum bit width of the respective memory block. Because true
dual-port RAM has outputs on two ports, the maximum width of the true
dual-port RAM equals half of the total number of output drivers.
Table 2â12 lists the possible M4K block mixed-port width configurations.
Table 2â12. Stratix II and Stratix II GX M4K Block Mixed-Port Width Configurations (True Dual-Port)
Read Port
4K Ã 1
2K Ã 2
1K Ã 4
512 Ã 8
256 Ã 16
512 Ã 9
256 Ã 18
4K Ã 1
v
v
v
v
v
2K Ã 2
v
v
v
v
v
Write Port
1K Ã 4
v
v
v
v
v
512 Ã 8
v
v
v
v
v
256 Ã 16
v
v
v
v
v
512 Ã 9
v
v
256 Ã 18
v
v
Table 2â13 lists the possible M-RAM block mixed-port width
configurations.
Table 2â13. Stratix II and Stratix II GX M-RAM Block Mixed-Port Width
Configurations (True Dual-Port)
Read Port
64K Ã 9
32K Ã 18
18K Ã 36
8K Ã 72
64K Ã 9
v
v
v
v
Write Port
32K Ã 18 18K Ã 36
v
v
v
v
v
v
v
v
8K Ã 72
v
v
v
v
2â16
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008
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