2

AT76C651B

1375BS–11/01

.

Table 1. Signal Description

Signal Name

Function

Number of I/Os

Pull-up

Voltage

Direction

2WSIADDR

2WSI circuit address selection

2

No

V

DD3

I

2WSISDA

SDA line of 2WSI

1

R = 15 k

Ω

V

DD5

I/O

2WSISCL

SCL line of 2WSI

1

No

I

T2WSISDA

2WSI bus data line SDA to/from tuner through bi-

directional switch

1R = 15 k

Ω

V

DD5

I/O

T2WSISCL

2WSI bus clock SCL to tuner through switch

1

No

O

IFIBB

IF 6 MSBs or I-baseband digital input

6

No

V

DD3

I

IFQBB

IF 4 LSBs or Q-baseband digital input 4 MSBs

4

No

V

DD3

I

QBB

Q-baseband digital input (2 LSBs)

2

No

I

PLLCTRL

PLL division/bypass control

3

No

V

DD3

I

XOCLK

Crystal oscillator input

1

No

V

DD3

I

XTAL_I

Crystal input

1

No

I

XTAL_O

Crystal output

1

No

V

DD3

O

OSCMODE

Oscillator input mode (low for crystal, high for XO)

1

No

V

DD3

I

LFTPLL

Low pass filter input to PLL

1

No

A

EXTADC

External AD converter. High = external, low = internal

1

No

V

DD3

I

ADCLK

Sampling clock for external AD converter

1

No

V

DD3

O

TDI

JTAG

1

No

I

TDO

JTAG

1

No

V

DD3

O

TMS

JTAG

1

No

V

DD3

I

TCK

JTAG

1

No

I

TRST

JTAG

1

No

V

DD3

I

DATAOUT

MPEG2-TS parallel byte <0:7> or serial bit stream

output <0>

8No

V

DD3

O

CORFAIL

RS packets not corrected

1

No

V

DD3

O

CORBYTE

Corrected byte indicator

1

No

V

DD3

O

DATAVALID

MPEG2-TS byte or bit output enable active at level 0 or

on both edges

1No

O

FRMSTART

Start of MPEG2-TS frame

1

No

V

DD3

O

FRMVALID

Valid MPEG2-TS frame control in parallel mode output

1

No

O

FLAGPID

PID filtering indicator

2

No

V

DD3

O

IRQ

Interrupt request. Open drain (pull-up or pull-down

depends on 2WSI configuration).

1No

V

DD3

O

LOCK1

Maskable lock signal 1

1

No

V

DD3

O

LOCK2

Maskable lock signal 2

1

No

V

DD3

O

CSTPWM

Configurable value output with PWM

1

No

V

DD5

O

AGC

Analog automatic gain control PWM

1

No

V

DD5

O