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AM79C970A датащи(PDF) 130 Page - Advanced Micro Devices

номер детали AM79C970A
подробное описание детали  PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
PDF  219 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970A датащи(HTML) 130 Page - Advanced Micro Devices

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AMD
P R E L I M I N A R Y
130
Am79C970A
CSR40: Current Receive Byte Count
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–12
RES
Reserved locations. Read and
written as ZEROs.
11–0
CRBC
Current Receive Byte Count.
This field is a copy of the BCNT
field of RMD1 of the current
receive descriptor.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
CSR41: Current Receive Status
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–0
CRST
Current Receive Status. This
field is a copy of bits 31–16
of
RMD1
of
the
current
receive descriptor.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
CSR42: Current Transmit Byte Count
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–12
RES
Reserved locations. Read and
written as ZEROs.
11–0
CXBC
Current Transmit Byte Count.
This field is a copy of the BCNT
field of TMD1 of the current
transmit descriptor.
15–0
CXST
Current Transmit Status. This
field is a copy of bits 31–16
of
TMD1
of
the
current
transmit descriptor.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
CSR44: Next Receive Byte Count
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–12
RES
Reserved locations. Read and
written as ZEROs.
11–0
NRBC
Next Receive Byte Count. This
field is a copy of the BCNT
field
of
RMD1
of
the
next
receive descriptor.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
CSR45: Next Receive Status
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–0
NRST
Next Receive Status. This field is
a copy of bits 31–16 of RMD1 of
the next receive descriptor.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
CSR46: Poll Time Counter
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
15–0
POLL
Poll
Time
Counter.
This
counter
is
incremented
by
the PCnet-PCI II
controller
microcode
and
is
used
to
trigger the descriptor ring polling
operation of the PCnet-PCI II
controller.
Read/Write
accessible
only
when either the STOP or the
SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.



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