User`s manual

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• Area 5 is allocated to PC Card Channel 1 (PCC1) and supports both memory and I/O
interfaces.
The ability to switch between Attribute memory or a Common memory, and I/O space is
determined by the memory addressed by the CPU..
Note that there is an overlap of memory space for the PCI apertures and the PCMCIA socket.
Via a two jumpers on the board, the user can select a PCI or PCMCIA aperture for address
Areas 5 or 6.
Jumper J35 must be removed from the Key West board in order to use the PCMCIA sockets. If
J35 is installed Area 5 and 6 can be used by the PCI interface and PCMCIA function is
disabled.
USB
This USB Host Controller is a PCI-like implementation of the Universal Serial Bus (USB) 1.1
specification utilizing the OpenHCI. It contains an integrated Root Hub with two host USB
ports, PCI-like interface, and USB Host Controller. The HD64465 companion chip on the
Tahoe board provides the USB interface and has the following features:
• Supports 2 USB ports
• Supports device bandwidth of 12Mbps or 1.5Mbps
• Supports power management mode to protect USB Bus power; and over-current detector
to protect USB Bus from abnormal over-current load
• Fully compatible with the USB specification version 1.1 and register compatible with
Open HCI specification version v1.0 supported by Microsoft, Compaq and National
Semiconductor.
• Internal 4 K-byte SRAM provided for USB Open Host Controller driver to store frame
lists, transaction descriptors for USB host controller’s schedule control and this internal
memory is also used as data buffer for host controller to send/receive data to/from USB
devices
For more information on the USB function, refer to the following references:
“USB Specification”, Version 1.1
“OpenHCI Specification”, Version 1.0
“PCI Specification”, Version 2.1
Sound System
The Tahoe board contains an AC97 compatible sound chip capable of recording and playing
back sounds and is supported by the HD64465 companion chip. A microphone connector is
supplied for the recording of sounds. In addition a PC style stereo output jack is provided for
connection to optional external speakers. Volume control and mute is under software control.
No mechanical volume or mute controls are provided.
The sound system uses the digital protocol support of the HD64465 companion chip coupled
with an external codec, the AC97.
Features:
• Directly interfaced to AC97 Codec for controlling voice data to the speaker, or from the
microphone.
• Full-duplex data transfer between CODEC and this interface
• Dual TX/RX FIFO ( 8 x 32 -bit) are supported
• Voice captures and playbacks can be supported by SH7709A/7729 PIO/DMA mode
access.
• Supports STANDBY mode
Auto PC Connector (factory installed option)