Datasheet

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 42 N06
A15/CIRDY 117 N18 50 P05
A19/CBLOCK 108 N14 41 N03
A20/CSTOP 111 P17 44 P02
A21/CDEVSEL 113 N15 46 P03
A22/CTRDY 116 N17 49 R02
BVD1(STSCHG)/CSTSCHG 141 H14 73 U09
BVD2(SPKR)/CAUDIO 140 H17 72 V09
CD1/CCD1 83 U11 15 H05
CD2/CCD2 144 G18 75 P09
INPACK/CREQ 130 K17 61 R07
READY/CINT 138 H19 69 V08
RESET/CRST 126 L15 58 W05
VS1/CVS1 137 J15 68 U08
VS2/CVS2 124 L18 56 P07
WAIT/CSERR 139 H18 71 W09
WP(IOIS16)/CCLKRUN 142 H15 74 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.