LC4512C-10F256AI Просмотр технического описания (PDF) - Lattice Semiconductor

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LC4512C-10F256AI

3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs

Lattice Semiconductor 

Lattice Semiconductor

ispMACH 4000V/B/C/Z Family Data Sheet

Output Routing Pool (ORP)

The Output Routing Pool allows macrocell outputs to be connected to any of several I/O cells within an I/O block.

This provides greater flexibility in determining the pinout and allows design changes to occur without affecting the

pinout. The output routing pool also provides a parallel capability for routing macrocell-level OE product terms. This

allows the OE product term to follow the macrocell output as it is switched between I/O cells. Additionally, the out-

put routing pool allows the macrocell output or true and complement forms of the 5-PT bypass signal to bypass the

output routing multiplexers and feed the I/O cell directly. The enhanced ORP of the ispMACH 4000 family consists

of the following elements:

• Output Routing Multiplexers

• OE Routing Multiplexers

• Output Routing Pool Bypass Multiplexers

Figure 7 shows the structure of the ORP from the I/O cell perspective. This is referred to as an ORP slice. Each

ORP has as many ORP slices as there are I/O cells in the corresponding I/O block.

Figure 7. ORP Slice

OE Routing Multiplexer

From PTOE

To I/O

Cell

OE

5-PT Fast Path

From Macrocell

ORP

Bypass

Multiplexer

Output

To I/O

Cell

Output Routing Multiplexer

Output Routing Multiplexers

The details of connections between the macrocells and the I/O cells vary across devices and within a device

dependent on the maximum number of I/Os available. Tables 5-9 provide the connection details.

Table 6. ORP Combinations for I/O Blocks with 8 I/Os

I/O Cell

I/O 0

I/O 1

I/O 2

I/O 3

I/O 4

I/O 5

I/O 6

I/O 7

Available Macrocells

M0, M1, M2, M3, M4, M5, M6, M7

M2, M3, M4, M5, M6, M7, M8, M9

M4, M5, M6, M7, M8, M9, M10, M11

M6, M7, M8, M9, M10, M11, M12, M13

M8, M9, M10, M11, M12, M13, M14, M15

M10, M11, M12, M13, M14, M15, M0, M1

M12, M13, M14, M15, M0, M1, M2, M3

M14, M15, M0, M1, M2, M3, M4, M5

9

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