A40MX02 datasheet(7/142 Pages) MICROSEMI

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40MX and 42MX FPGA Families

Re vi s i on 11

1-3

A42MX24 and A42MX36 devices contain D-modules, which are arranged around the periphery of the

device. D-modules contain wide-decode circuitry, providing a fast, wide-input AND function similar to that

found in CPLD architectures (Figure 1-4). The D-module allows A42MX24 and A42MX36 devices to

perform wide-decode functions at speeds comparable to CPLDs and PALs. The output of the D-module

has a programmable inverter for active HIGH or LOW assertion. The D-module output is hardwired to an

output pin, and can also be fed back into the array to be incorporated into other logic.

Dual-Port SRAM Modules

The A42MX36 device contains dual-port SRAM modules that have been optimized for synchronous or

asynchronous applications. The SRAM modules are arranged in 256-bit blocks that can be configured as

32x8 or 64x4. SRAM modules can be cascaded together to form memory spaces of user-definable width

and depth. A block diagram of the A42MX36 dual-port SRAM block is shown in Figure 1-5.

The A42MX36 SRAM modules are true dual-port structures containing independent read and write ports.

Each SRAM module contains six bits of read and write addressing (RDAD[5:0] and WRAD[5:0],

respectively) for 64x4-bit blocks. When configured in byte mode, the highest order address bits (RDAD5

and WRAD5) are not used. The read and write ports of the SRAM block contain independent clocks

(RCLK and WCLK) with programmable polarities offering active HIGH or LOW implementation. The

SRAM block contains eight data inputs (WD[7:0]), and eight outputs (RD[7:0]), which are connected to

segmented vertical routing tracks.

The A42MX36 dual-port SRAM blocks provide an optimal solution for high-speed buffered applications

requiring FIFO and LIFO queues. The ACTgen Macro Builder within Microsemi's Designer software

Figure 1-3 •

42MX S-Module Implementation

CLR

Up to 7-Input Function Plus D-Type Flip-Flop with Clear

Up to 4-Input Function Plus Latch with Clear

GATE

CLR

OUT

Up to 8-Input Function (Same as C-Module)

D00

D01

D10

D11

OUT

Up to 7-Input Function Plus Latch

D00

D01

D10

D11

OUT

GATE

D00

D01

D10

D11

OUT

A40MX02 Datasheet(PDF) 7 Page - Microsemi Corporation

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