EP1M350 datasheet(42/86 Pages) ALTERA

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Altera Corporation

Mercury Programmable Logic Device Family Data Sheet

Single-Port Mode

The Mercury device’s ESB also supports a single-port mode, which is used

when simultaneous reads and writes are not required. See Figure 21. A

single ESB can support up to two single-port mode RAMs.

Figure 21. ESB in Single-Port Mode

Note (1)

Notes to Figure 21:

(1)

All registers can be asynchronously cleared by ESB local interconnect signals, global signals, or chip-wide reset.

(2)

If there is only one single-port RAM block in an ESB, it can support the following configurations: 4,096

× 1; 2,048 ×2;

1,028 × 4; 512 × 8; 256 × 16; or 128 × 32.

Content-Addressable Memory

Mercury devices can implement CAM in ESBs. CAM can be thought of as

the inverse of RAM. RAM stores data in a specific location; when the

system submits an address, the RAM block provides the data. Conversely,

when the system submits data to CAM, the CAM block provides the

address where the data is found. For example, if the data FA12 is stored

in address 14, the CAM outputs 14 when FA12 is driven into it.

Dedicated Clocks

ENA

data[ ]

address[ ]

RAM/ROM (2)

128

× 16

256

× 8

512

× 4

1,024

× 2

2,048

× 1

Data In

Address

Write Enable

Data Out

outclken

inclken

inclock

outclock

Write

Pulse

Generator

wren

Dedicated Fast

Global Signals

To FastTrack

Interconnect

EP1M350 Datasheet(PDF) 42 Page - Altera Corporation

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