The SA110 address bus connects only to the FootBridge and the boot FLASH,
which converts it into the memory address bus, and PCI address.
The SA110 data bus connects only to the FootBridge, the SDRAM array
and the boot FLASH.
The SA110 control bus connects only to the FootBridge.
The FootBridge manages a single DIMM socket of SDRAM, and a single Flash
device for boot. All these devices operate at 3V.
The FootBridge provides:
The VGA is addressed through PCI I/O space ports, using similar-to-PC addresses ports.
It is connected to the video capture port so that the VGA can display a live image of the video capture source.
The Ether10 port is managed by a Winbond '940 chip. This chip has 32k
bytes of local RAM. It is NE2000 compatible.
This device has DMA access to the host memory, although the path is
a bit circuitous. The SoundBlaster is on the ISA bus, and must request
an ISA DMA channel. The '553 device must be set up so that the ISA DMA
request goes through to the PCI DMA channel.
The SoundBlaster audio ports are connected to various devices. Audio
out goes to:
The audio in comes from:
First, the local audio can be connected to either a telephone handset
or to a telephone set. The VNC has ports for connecting either. The first
option allows the user to plug in a handset or headset that is compatible
with most telephones. The second option allows the user to plug in a regular
telephone. With a real telephone, the user has a dial pad and a "cradle"
for the handset. In both cases, the audio source/sink is the SoundBlaster
port.
IDE Controller
The IDE is managed by the Winbond '553 chip, which contains a "sonata"
core. This core implements:
SuperIO
The SuperIO chip implements
Audio Services
The audio port is implemented through a SoundBlaster compatible device.
This will allow us to sample/playback at any rate from 8Ks/s to 44.1Ks/s,
mono or stereo.
The host can select which audio source to use.
Telephony Services
The telephony services come in two sections: local audio, and outside line.
Freq | Used by |
3.57MHz | SA-110 |
25MHz | Ether100 phy chip |
20MHz | Ether10 chip; Ether100 controller chip |
14.318/17.734MHz | VGA |
18.432MHz | SuperIO (977) |
66MHz | Footbridge |
Signal | Direction | Physical |
VGA | out | 15 pin sub D |
NTSC out | out analog | RCA |
NTSC in | in analog | RCA |
audio out | out analog | walkman jack |
audio in | in analog | walkman jack |
power | in | ac adapter |
parallel port | in/out | 25 pin sub D |
serial | in/out | 9 pin sub D |
Ethernet 100/10 | in/out | RJ45 |
Ethernet 10 | in/out | RJ45 |
handset | in/out analog | RJ11 |
telephone | in/out analog | RJ45 |
IR | in/out | [through front panel] |
keyboard | in | DIN5 |
mouse | in | DIN5 |