phyCARD-M [PCA-A-M1-xxx]
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©
PHYTEC Messtechnik GmbH 2010 L-750e_1
With reference to the X-Arc bus specification, the main purpose of
this interface is to connect to an external codec, such as AC97. In
AC97 mode the clock and the frame sync signal are synchronous for
the receive and transmit sections of the i.MX35 SSI module. Thus
only four signals extend from the i.MX35 Digital Audio MUX
(AUDMUX) to the phyCARD-Connector (X_STXD4, X_SRXD4,
X_SCK4, X_STXFS4). X_AC97_INT and X_AC97_nRESET are two
additional pins assisting the functionality of this interface.
X_AC97_INT is used as input and output. As output it signals which
codec is supported by the phyCARD. Use of this pin as an input
enables to attach an external interrupt to port GPIO2_1 (at W14).
X_AC97_nRESET is connected to port GPIO3_2 (at R5) of the
i.MX35 allowing to perform a software reset for the device attached to
the interface. Please also read the phyCARD Design-In Guide for
more information about how to use the AC97 interface.
Pin # Signal
I/O SL
Description
X2A4
2
X_AC97_INT I/O
VDD_3V3
AC97 Interrupt Input
X2A4
3
X_STXD4 O
VDD_3V3
AC97 Transmit Output
X2A4
4
X_SRXD4 I
VDD_3V3
AC97 Receive Input
X2B4
2
X_SCK4 I
VDD_3V3 AC97
Clock
X2B4
3
X_STXFS4 O
VDD_3V3 AC97
SYNC
X2B4
4
X_AC97_nRESE
T
O
VDD_3V3 AC97
Reset
Table 21:
SSI Interface Signal Location