AM79C978A AMD [Advanced Micro Devices], AM79C978A Datasheet - Page 239
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AM79C978A
Manufacturer Part Number
AM79C978A
Description
Single-Chip 1/10 Mbps PCI Home Networking Controller
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79C978A.pdf
(256 pages)
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S6
C8
N2
After the ownership of descriptor number 2 has
been changed by the controller, the next driver
poll of the second descriptor will show owner-
ship granted to the CPU. The driver now cop-
ies the data from buffer number 2 into the
middle section of the application buffer space.
This operation is interleaved with the C7 and
C8 operations.
The controller will perform data DMA to the
last buffer, whose pointer is pointing to appli-
cation space. Data entering the least buffer
will not need the infamous double copy that is
required by existing drivers, since it is being
placed directly into the application buffer
space.
The message on the wire ends.
Am79C978A
S7
C9
S8
S9
S10
When the driver completes the copy of buffer
number 2 data to the application buffer space,
it begins polling descriptor number 3.
When the controller has finished all data DMA
operations, it writes status and changes owner-
ship of descriptor number 3.
The driver sees that the ownership of descrip-
tor number 3 has changed, and it calls the ap-
plication to tell the application that a frame
has arrived.
The application processes the received frame
and generates the next TX frame, placing it
into a TX buffer.
The driver sets up the TX descriptor for
the controller.
B-3
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