PCI1520PDV datasheet(44/140 Pages) TI

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3−9

Table 3−5. Integrated Pullup Resistors

SIGNAL NAME

TERM. NUMBER SOCKET A

TERM. NUMBER SOCKET B

SIGNAL NAME

PDV

GHK

PDV

GHK

A14/CPERR

109

R18

N06

A15/CIRDY

117

N18

P05

A19/CBLOCK

108

N14

N03

A20/CSTOP

111

P17

P02

A21/CDEVSEL

113

N15

P03

A22/CTRDY

116

N17

R02

BVD1(STSCHG)/CSTSCHG

141

H14

U09

BVD2(SPKR)/CAUDIO

140

H17

V09

CD1/CCD1

U11

H05

CD2/CCD2

144

G18

P09

INPACK/CREQ

130

K17

R07

READY/CINT

138

H19

V08

RESET/CRST

126

L15

W05

VS1/CVS1

137

J15

U08

VS2/CVS2

124

L18

P07

WAIT/CSERR

139

H18

W09

WP(IOIS16)/CCLKRUN

142

H15

R09

3.5.7

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 PCI1520. The CardBus CAUDIO signal

also can pass a single-amplitude binary waveform. The binary audio signals from the two PC Card sockets are XORed

in the PCI1520 to produce SPKROUT. This output is enabled by bit 1 (SPKROUTEN) in the card control register (PCI

offset 91h, see Section 4.32).

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 PCI1520

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

socket 0 audio takes precedence. See Section 4.30, Multifunction Routing Register, for details on configuring the

MFUNC terminals.

Figure 3−6 provides an illustration of a sample application using SPKROUT and CAUDPWM.

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