Specifications ispLSI 2128VE

11

Signal Descriptions

RESET

Active Low (0) Reset pin resets all the registers in the device.

GOE 0, GOE1

Global Output Enable input pins.

Y0, Y1, Y2

Dedicated Clock Input – These clock inputs are connected to one of the clock inputs of all the GLBs in

the device.

BSCAN

Input – Dedicated in-system programming Boundary Scan enable input pin. This pin is brought low to

enable the programming mode. The TMS, TDI, TDO and TCK controls become active.

TDI/IN 0

Input – This pin performs two functions. When

BSCAN is logic low, it functions as a serial data input pin

to load programming data into the device. When

BSCAN is high, it functions as a dedicated input pin.

TCK/IN 3

Input – This pin performs two functions. When

BSCAN is logic low, it functions as a clock pin for the

Boundary Scan state machine. When

BSCAN is high, it functions as a dedicated input pin.

TMS/IN 1

Input – This pin performs two functions. When

BSCAN is logic low, it functions as a mode control pin for

the Boundary Scan state machine. When

BSCAN is high, it functions as a dedicated input pin.

TDO/IN 2

Output/Input – This pin performs two functions. When

BSCAN is logic low, it functions as an output pin

to read serial shift register data. When

BSCAN is high, it functions as a dedicated input pin.

IN 4 - IN 7

Dedicated Input Pins to the device.

GND

Ground (GND)

VCC

Vcc

No Connect

I/O

Input/Output Pins – These are the general purpose I/O pins used by the logic array.

Signal Name

Description

1. NC pins are not to be connected to any active signals, VCC or GND.