LX256VCFN2083 datasheet(7/72 Pages) LATTICE

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Lattice Semiconductor

ispGDX2 Family Data Sheet

Figure 4. ispGDX2 Family Control Array

sysIO Banks

The inputs and outputs of ispGDX2 devices are divided into eight sysIO banks, where each bank is capable of sup-

porting different I/O standards. The number of I/Os per bank is 32, 16 and 8 for the 256-, 128- and 64-I/O devices

respectively. Each sysIO bank has its own I/O supply voltage (VCCO) and reference voltage (VREF), allowing each

bank complete independence from the other banks. Each I/O within a bank can be individually conﬁgured to any

standard consistent with the VCCO and VREF settings. Figure 5 shows the I/O banks for the ispGDX2-256 device.

The I/O of the ispGDX2 devices contain a programmable strength and slew rate tri-state output buffer, a program-

mable input buffer, a programmable pull-up resistor, a programmable pull-down resistor and a programmable bus-

keeper latch. These programmable capabilities allow the support of a wide range of I/O standards.

MUX Select

to Nibble 0

MUX Select

to Nibble 1

MUX Select

to Nibble 2

MUX Select

to Nibble 3

To MRB Clock/

Clock Enable

To MRB

Set/Reset

To MRB

Output Enable

32 Inputs from Control GRP

Each connection

is programmable.

On selected blocks,

this signal can reset

the M Divider of the

PLL.

LX256VCFN2083 Datasheet(PDF) 7 Page - Lattice Semiconductor