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SC1100 Datasheet(PDF) 44 Page - National Semiconductor (TI) |
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SC1100 Datasheet(HTML) 44 Page - National Semiconductor (TI) |
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44 / 348 page  www.national.com 44 Revision 1.1 Signal Definitions (Continued) DCD# AE12 I Data Carrier Detected. When low, indicates that the data transfer device (e.g., modem) is ready to establish a communications link. GPIO9+ IDE_IOW1#+ F_IRDY# DSR# AF12 I Data Set Ready. When low, indicates that the data trans- fer device (e.g., modem) is ready to establish a communi- cations link. GPIO10+ IDE_IORDY1+ F_FRAME# IRRX1 AE18 I IR Receive. Primary input to receive serial data from the IR transceiver. Monitored during power-off for wakeup event detection. GPIO16+ PC_BEEP+ F_DEVSEL IRTX C20 O IR Transmit. IR serial output data. GXCLK+TEST3 2.4.10 AC97 Audio Interface Signals Signal Name Ball No. Type Description Mux BIT_CLK AC22 I Audio Bit Clock. The serial bit clock from the codec. F_TRDY# SDATA_OUT AD22 O Serial Data Output. This output transmits audio serial data to the codec. CLKSEL2 (Strap) SDATA_IN AF22 I Serial Data Input. This input receives serial data from the primary codec. F_GNT0# SYNC AE22 O Serial Bus Synchronization. This bit is asserted to syn- chronize the transfer of data between the SC1100 and the AC97 codec. CLKSEL3 (Strap) AC97_CLK AC21 O Codec Clock. It is twice the frequency of the Audio Bit Clock. --- AC97_RST# AF23 O Codec Reset. S3 to S5 wakeup is not supported because AC97_RST# is powered by VIO. If wakeup from states S3 to S5 are needed, a circuit in the system board should be used to reset the AC97 codec. F_STOP PC_BEEP AE18 O PC Beep. Legacy PC/AT speaker output. GPIO16+IRRX1+ F_DEVSEL# 2.4.11 Power Management Interface Signals Signal Name Ball No. Type Description Mux GPWIO0 AC15 I/O General Purpose Wakeup I/Os. These signals each have an internal pull-up of 100 K Ω. --- GPWIO1 AE16 I/O --- GPWIO2 AF17 I/O --- ONCTL# AD15 O On / Off Control. This signal indicates to the main power supply that power should be turned on. This signal is an open-drain output. --- 2.4.9 Serial Port (UART) and Infrared (IR) Interface Signals (Continued) Signal Name Ball No. Type Description Mux |
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