STPCCLIENT datasheet(20/48 Pages) STMICROELECTRONICS

20 / 48 page

PIN DESCRIPTION

20/48

Issue 1.7 - February 8, 2000

ISACLK and ISACLKX2 as the input selection

strobes.

DREQ_MUX[1:0]

ISA Bus Multiplexed DMA Re-

quest. These are the ISA bus DMA request sig-

nals. They are to be encoded before connection to

the STPC Client using ISACLK and ISACLKX2 as

the input selection strobes.

DACK_ENC[2:0]

DMA Acknowledge. These are

the ISA bus DMA acknowledge signals. They are

encoded by the STPC Client before output and

should be decoded externally using ISACLK and

ISACLKX2 as the control strobes.

ISA Terminal Count. This is the terminal count

output of the DMA controller and is connected to

the TC line of the ISA bus. It is asserted during the

last DMA transfer, when the Byte count expires.

2.2.12. MONITOR INTERFACE

RED, GREEN, BLUE

RGB Video Outputs. These

are the 3 analog color outputs from the RAMDACs

VSYNC

Vertical Synchronization Pulse. This is

the vertical synchronization signal from the VGA

controller.

HSYNC

Horizontal Synchronization Pulse. This is

the horizontal synchronization signal from the

VGA controller.

VREF_DAC

DAC Voltage reference. An external

voltage reference is connected to this pin to bias

the DAC.

RSET

Resistor Current Set. This reference cur-

rent input to the RAMDAC is used to set the full-

scale output of the RAMDAC.

COMP

Compensation. This is the RAMDAC com-

pensation pin. Normally, an external capacitor

(typically 10nF) is connected between this pin and

VDD to damp oscillations.

DDC[1:0]

Direct Data Channel Serial Link. These

bidirectional pins are connected to CRTC register

3Fh to implement DDC capabilities. They conform

to I

2C electrical specifications, they have open-

collector output drivers which are internally con-

nected to VDD through pull-up resistors.

They can instead be used for accessing I C devic-

es on board. DDC1 and DDC0 correspond to SCL

and SDA respectively.

2.2.13. MISCELLANEOUS

ST[6],

Reserved.

ST[5] This is used for speaker output.

ST[4]

Reserved.

ST[3:0] The pins are for testing the STPC. The

default settings on these pins should be 1111 for

the STPC to function correctly. By setting the

ST[3:0] to 0111, the STPC is tristated.

CLKDEL[2:0]

Reserved. The pins are reserved

for Test and Miscellaneous functions)

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