參數(shù)資料
型號(hào): AM79C970A
廠商: Advanced Micro Devices, Inc.
英文描述: PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
中文描述: PCnet - 2的PCI單芯片全雙工以太網(wǎng)控制器,適用于PCI總線產(chǎn)品
文件頁(yè)數(shù): 122/219頁(yè)
文件大小: 1065K
代理商: AM79C970A
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AMD
P R E L I M I N A R Y
122
Am79C970A
Read/Write accessible always.
MPEN is cleared to ZERO by
H_RESET or S_RESET and is
not affected by setting the
STOP bit.
Magic Packet Mode. Setting
MPMODE to ONE will redefine
the
SLEEP
pin to be a magic
packet
enable
PCnet-PCI II controller will enter
the magic packet mode when
MPMODE is set to one and either
SLEEP
is asserted or MPEN is
set to ONE.
Read/Write accessible always.
MPMODE is cleared to ZERO by
H_RESET or S_RESET and is
not affected by setting the
STOP bit.
Suspend. Setting SPND to ONE
will cause the PCnet-PCI II con-
troller to start entering the sus-
pend mode. The host must poll
SPND until it reads back ONE to
determine that the PCnet-PCI II
controller has entered the sus-
pend mode. Setting SPND to
ZERO will get the PCnet-PCI II
controller out of suspend mode.
SPND can only be set to ONE if
STOP (CSR0, bit 2) is cleared to
ZERO. H_RESET, S_RESET or
setting the STOP bit will get the
PCnet-PCI II controller out of
suspend mode.
When the host requests the
PCnet-PCI II controller to enter
the suspend mode, the device
first finishes all on-going transmit
activity and updates the corre-
sponding transmit descriptor en-
tries. It then finishes all on-going
receive activity and updates the
corresponding receive descriptor
entries. It then sets the read-ver-
sion of SPND to ONE and enters
the suspend mode.
In suspend mode, all of the
CSR and BCR registers are
accessible. As long as the
PCnet-PCI II controller is not re-
set while in suspend mode (by
H_RESET, S_RESET or by set-
ting the STOP bit), no re-initiali-
zation of the device is required
after the device comes out of
suspend mode. The PCnet-PCI II
controller will continue at the
transmit and receive descriptor
ring locations where it had left off.
Read/Write accessible always.
SPND is cleared by H_RESET,
1
MPMODE
pin.
The
0
SPND
S_RESET or by setting the
STOP bit.
CSR6: RX/TX Descriptor Table Length
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains a copy of the transmit
encoded ring length (TLEN) field
read from the initialization block
during PCnet-PCI II controller in-
itialization. This field is written
during the PCnet-PCI II controller
initialization routine.
Read accessible only when
either the STOP or the SPND bit
is set. Write operations have no
effect and should not be per-
formed. TLEN is only defined
after initialization. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
Contains a copy of the receive
encoded ring length (RLEN) read
from the initialization block
during PCnet-PCI II controller
initialization. This field is written
during the PCnet-PCI II controller
initialization routine.
Read accessible only when
either the STOP or the SPND bit
is set. Write operations have no
effect and should not be per-
formed. RLEN is only defined af-
ter initialization. These bits
are unaffected by H_RESET,
S_RESET or by setting the
STOP bit.
Reserved
locations.
as ZEROs. Write operations
are ignored.
15–12 TLEN
11–8
RLEN
7–0
RES
Read
CSR8: Logical Address Filter 0
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Logical
Address
LADRF[15:0]. The content of this
register is undefined until loaded
from the initialization block after
the INIT bit in CSR0 has been set
or a direct register write has been
performed on this register.
Read/Write
accessible
when either the STOP or the
SPND bit is set. These bits
15–0LADRF[15:0]
Filter,
only
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