SAA7780 データシートの表示（PDF） - Philips Electronics

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SAA7780

ThunderBird Q3D™ PCI Audio Accelerator

Philips Electronics 

Philips Semiconductors

Product Specification

ThunderBird Q3D PCI Audio

Accelerator

SAA7780

MIDI Interface

MIDIIN

18

MIDIOUT

11

I-T

MIDI Serial Data Input

This signal is part of the standard 2 wire MIDI interface. This input

receives MIDI data at a rate of 31.25Kbaud. Optical isolation is

required.

O-T

MIDI Serial Data Output

This signal is part of the standard 2 wire MIDI interface. This output

transmits MIDI data at a rate of 31.25Kbaud. Optical isolation is

required.

PLL/DSP CLK Subsystem Interface

XTALIN

23

I-C

XTALOUT

24

O-C

OSC Clock Crystal Pad

This pin pair describes the pad required for the 14.31818MHz OSC

pad oscillator. The OSC clock is used to provide a fixed timebase for

many functions within the SAA7780 device.

DSPCLK

27

I-T

DSP Clock Input

This pin can be used as the clock input for the SAA7780 for the DSP

subsystem in place of the PLL driving the clock. DSPCLK is also

used to drive the DSP subsystem for controllability during testing.

PSUB

20

AGND

PLL Substrate

PLLDPWR

22

DPWR PLL Digital Power

PLLDGND

25

DGND

PLL Digital Ground

PLLAPWR

21

APWR PLL Analog Power

PLLAGND

19

AGND

PLL Analog Ground

DSP External Memory Interface

MA[14:0]

143,141,140, O-T

139,137,136,

134,132,131,

130,129,127,

126,125,124

External Memory Address

Address lines for the external SRAM devices. The external memory

interface can be used for DSP code space if the EXT_SRAM_EN (in

HDCFG, bit 5) is set. Otherwise, the reverb accelerator will use the

external SRAM.

1999 Sep 30

22

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