PCI4510 datasheet(51/220 Pages) TI

51 / 220 page

3−7

Table 3−3. Integrated Pullup Resistors

SIGNAL NAME

TERMINAL NUMBER

SIGNAL NAME

PDV

GHK

RGVF

A14/CPERR

154

F15

F10

A15/CIRDY

160

F13

B08

A19/CBLOCK

153

E18

E10

A20/CSTOP

155

E17

A09

A21/CDEVSEL

157

A16

C09

A22/CTRDY

159

E14

A08

BVD1(STSCHG/RI)/CSTSCHG

185

A09

B02

BVD2(SPKR)/CAUDIO

184

F10

A02

CD1/CCD1

125

L17

C15

CD2/CCD2

187

C09

E05

INPACK/CREQ

173

B12

E07

READY/CINT

182

C10

C04

RESET/CRST

169

B13

A06

VS1/CVS1

181

B10

A03

VS2/CVS2

167

F12

E08

WAIT/CSERR

183

E10

B03

WP(IOIS16)/CCLKRUN

186

B09

C03

3.5.6

SPKROUT and CAUDPWM Usage

SPKROUT carries the digital audio signal from the PC Card to the system. When a 16-bit PC Card is configured for

I/O mode, the BVD2 terminal becomes SPKR. This terminal is also used in CardBus binary audio applications, and

is referred to as CAUDIO. SPKR passes a TTL-level digital audio signal to the PCI4510 device. The CardBus CAUDIO

signal also can pass a single-amplitude binary waveform. The binary audio signals from the PC Card socket are

XORed in the PCI4510 device to produce SPKROUT. This output is enabled by bit 1 (SPKROUTEN) in the card

control register (PCI offset 91h, see Section 4.36).

Older controllers support CAUDIO in binary or PWM mode but use the same terminal (SPKROUT). Some audio chips

may not support both modes on one terminal and may have a separate terminal for binary and PWM. The PCI4510

implementation includes a signal for PWM, CAUDPWM, which can be routed to an MFUNC terminal. Bit 2

(AUD2MUX), located in the card control register, is programmed on a per-socket function basis to route a CardBus

CAUDIO PWM terminal to CAUDPWM. If both CardBus functions enable CAUDIO PWM routing to CAUDPWM, then

CardBus socket audio takes precedence. See Section 4.34, Multifunction Routing Status Register, for details on

configuring the MFUNC terminals.

Figure 3−5 provides an illustration of a sample application using SPKROUT and CAUDPWM.

Speaker

Subsystem

BINARY_SPKR

System

Core Logic

PCI4510

CAUDPWM

SPKROUT

PWM_SPKR

Figure 3−5. Sample Application of SPKROUT and CAUDPWM

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