TPU2735 Ver la hoja de datos (PDF) - Unspecified

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TPU2735

Teletext Processor

Unspecified 

TPU 2735

Pin 11 – Undelayed Horizontal Blanking Pulse/ D2SYNC

Input (Fig. 3–8)

This pin is connected to the undelayed horizontal blank-

ing output of the deflection processor DPU25xx. For

D2MAC teletext mode this pin is also connected to the

D2SYNC output of the D2MAC processor DMA2270.

(Both pins are tristate outputs).

Pin 12 – Vertical Blanking Pulse (Fig. 3–8)

This pin is connected to the “combined delayed horizon-

tal and vertical blanking pulse” output of the DPU25xx.

Pin 13 – Reset Input (Fig. 3–8)

Provided a clock is present at pin 36, a low level at pin

9 resets the internal circuitry of the TPU 2735. For nor-

mal operation high level is required.

Pins 14 to 16 – IM Bus Connections

By means of these pins, the TPU 2735 is linked with the

CCU. Pins 15 (Ident Input) and 16 (Clock Input) are con-

figured as shown in Fig. 3–8. Pin 14 (Data Input/Output)

is shown in Fig. 3–9. The data transfer via the IM bus is

explained in section 6.

Pin 17 to 19, 21 to 26 – DRAM Address Outputs (Fig.

3–7)

Pin 27 – DRAM Data Input/Output (Fig. 3–10)

Pin 28 – Read/Write Output (Fig. 3–7)

This output supplies the R/W control signal to the exter-

nal DRAM.

Pin 29 – CAS Output (Fig. 3–7)

This output supplies the Column Address Select (CAS)

signal for the external DRAM.

Pin 30 – RAS Output (Fig. 3–7)

This output supplies the Row Address Select (RAS) sig-

nal for the external DRAM.

Pin 31 – Deflection Skew Data Input (Fig. 3–11)

This pin can be connected to pin 7 of the DPU 25xx De-

flection Processor. When DSEN = 1 (see R-DAC of reg-

ister chain 2) this input controls the horizontal position of

the Teletext RGB signal.

Pins 32 to 34 – RGB Inputs (Fig. 3–6)

These pins can be connected to an external RGB

source. The specified level of these signals is 0 V to 0.7

V. For other DC levels, an AC coupling has to be used

to pins 32 to 34, and a clamping circuit in the VCU has

to adjust the DC level.

Pin 35 – VSUP, 5V Supply Voltage

Pin 36 – ΦM Main Clock Input (Fig. 3–12)

Via this pin the TPU 2735 is supplied with the required

main clock signal of 20.25, 17.7, 14.4 MHz produced by

the MCU 2600 or MCU 2632 Clock Generator IC.

Pin 38 – D2Data Input (Fig. 3–8)

For D2MAC teletext acquisition this pin is connected to

the D2Data Output of the DMA 2270.

9

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