ONKYO HT-R940
Service Manual

TX-SR574 IC BLOCK DIAGRAM AND TERMINAL DESCRIPTIONS-17
Q4001 : ADV7183 (Advanced Video Decoder with 10-Bit ADC and Component Input Support)-2/3
TERMINAL DESCRIPTION (1/2)
Pin 1 Mnemonic VS/VACTIVE Input/Output O Function VS or Vertical Sync. A dual-function pin, (OM_SEL[1:0] = 0, 0) is an output signal that indicates a vertical sync with respect to the YUV pixel data. The active period of this signal is six lines of video long. The polarity of the VS signal is controlled by the PVS bit. VACTIVE (OM_SEL[1:0] = 1, 0 or 0, 1) is an output signal that is active during the active/viewable period of a video field. The polarity of VACTIVE is controlled by PVS bit. HS or Horizontal Sync. A dual-function pin, (OM_SEL[1:0] = 0, 0) is a programmable horizontal sync output signal. The rising and falling edges can be controlled by HSB[9:0] and HSE[9:0] in steps of 2 LLC1. The polarity of the HS signal is controlled by the PHS bit. HACTIVE (OM_SEL[1:0]= 1, 0 or 0, 1) is an output signal that is active during the active/viewable period of a video line. The active portion of a video line is programmable on the ADV7183. The polarity of HACTIVE is controlled by PHS bit. Digital I/O Ground Digital I/O Supply Voltage (3.3 V) Video Pixel Output Port. 8-bit multiplexed YCrCb pixel port (P15-P8), 16-bit YCrCb pixel port (P15-P8 = Y and P7-P0 = Cb,Cr). Ground for Digital Supply Digital Supply Voltage (3.3 V) Almost Full Flag. A FIFO control signal indicating when the FIFO has reached the almost full margin set by the user (use FFM[4:0]). The polarity of this signal is controlled by the PFF bit. Half Full Flag. A multifunction pin, (OM_SEL[1:0] = 1, 0) is a FIFO control signal that indicates when the FIFO is half full. The QCLK (OM_SEL[1:0] = 0, 1) pin function is a qualified pixel output clock when using FIFO SCAPI mode. The GL (OM_SEL[1:0] = 0, 0) function (Genlock output) is a signal that contains a serial stream of data that contains information for locking the subcarrier frequency. The polarity of HFF signal is controlled by PFF bit. Almost Empty Flag. A FIFO control signal, it indicates when the FIFO has reached the almost empty margin set by the user (use FFM[4:0]). The polarity of this signal is controlled by PFF bit. Asynchronous FIFO Clock. This asynchronous clock is used to output data onto the P19-P0 bus and other control signals. General-Purpose Outputs controlled via I 2 C Clock Reference Output. This is a clock qualifier distributed by the internal CGC for a data rate of LLC2. The polarity of LLCREF is controlled by the PLLCREF bit. Line-Locked Clock System Output Clock/2 (13.5 MHz) Line-Locked Clock System Output Clock. A dual-function pin (27 MHz or a FIFO output clock ranging from 20 MHz to 35 MHz. Second terminal for crystal oscillator; not connected if external clock source is used. Input terminal for 27MHz crystal oscillator or connection for external oscillator with CMOS-compatible square wave clock signal Power-Down Enable. A logical low will place part in a power-down status. This pin is used for the External Loop Filter that is required for the LLC PLL. 5%)

2

HS/HACTIVE

O

3, 14 4, 15

DVSSIO DVDDIO

G P O G P O

5-8, 19-24, P15-P0 32, 33, 73-76 9, 31, 71 10, 30, 72 11 DVSS1-3 DVDD1-3 AFF

12

HFF/QCLK/GL

I/O

13

AEF

O

16

CLKIN

I O O

17, 18, 34, 35 GPO[3:0] 25 LLCREF

26 27 28 29 36 37 38 39

LLC2 LLC1/PCLK XTAL1 XTAL PWRDN ELPF PVDD PVSS

O O O I I I P G