GC3021 datasheet(16/37 Pages) TI1

16 / 37 page

GRAYCHIP, INC.

- 14 -

JUNE 22, 1998

GC3021 MIXER AND CARRIER REMOVAL CHIP

DATA SHEET

This document contains information which may be changed at any time without notice

EOUT

PHASE ERROR OUT.

Active high

The phase error RAM output is clocked out of the chip on this pin.

This signal is made available mostly for diagnostic purposes.

SYNC OUT.

Active low

This signal is either one of the input syncs, a reclocked version of

HSI, the one shot sync OS, or the internal counter’s terminal count

strobe TC.

C[0:15]

CONTROL DATA I/O BUS.

Active high

This is the 16 bit control data I/O bus. Control register contents are

loaded into the chip or read from the chip through these pins. The

chip will only drive these pins when CS is low and R/W is high.

A[0:8]

CONTROL ADDRESS BUS.

Active high

These pins are used to address the control registers, phase error

RAM and the snapram memory within the chip.

R/W

READ/WRITE CONTROL.

High for read, low for write

This pin determines if the control bus cycle is a read or write

operation. The pin is high for a read and is low for a write.

CONTROL STROBE.

Active low

This control strobe enables the read or write operation. The

contents of the register or memory location selected by A[0:8] will

be output on C[0:15] when R/W is high and CS is low. If R/W is

low when CS goes low, then the selected register will be loaded

with the contents of C[0:15].

HCK,HCK

HIGH SPEED CLOCK INPUT.

Active high

The differential PECL clock used in the high speed mode to clock

in the double rate real data.

HSI,HSI

HIGH SPEED SYNC INPUT.

Active high

The differential PECL sync input used in the high speed mode to

synchronize the input format circuit.

HCKO

HS/2 CLOCK OUTPUT.

Active high

The high speed clock is divided by two and output on this pin. The

HCKO clock should be buffered if it is to be used by other circuits.

The buffered version of HCKO should be used as the CK input to

the chip.

VTERM

TERMINATION SUPPLY VOLTAGE.

Fixed voltage

The termination supply pins, The I, Q, HCK, HCK, HSI and HSI

pads have switchable 70 Ohm termination resistors tied to

VTERM. The VTERM voltage must not exceed VCC or be less

than GND.

VCC

SUPPLY VOLTAGE.

Fixed voltage

The power supply pins.

GND

CHIP GROUND.

Fixed voltage

The power supply ground pins.

GC3021 Datasheet(PDF) 16 Page - Texas Instruments

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