AM79C976KI AMD (ADVANCED MICRO DEVICES), AM79C976KI Datasheet - Page 180

• Manufacturer Part Number: AM79C976KI
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C976KI

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.97V
• Operating Supply Voltage (max): 3.63V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / RoHS Status: Not Compliant

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180
RES
TXDPOLL
APAD_XMT Auto Pad Transmit. When set,
ASTRP_RCVAuto Strip Receive. When set,
MFCO
zero and read as undefined.
POLL is set, the Buffer Manage-
ment Unit will disable transmit
polling. Likewise, if TXDPOLL is
cleared, automatic transmit poll-
ing is enabled. If TXDPOLL is set,
TDMD bit in CSR0 must be set in
order to initiate a manual poll of a
transmit descriptor. Transmit de-
scriptor polling will not take place
if TXON is reset. Transmit polling
will take place following Receive
activities.
Read/Write
POLL is cleared by H_RESET or
S_RESET and is unaffected by
the STOP bit.
APAD_XMT enables the auto-
matic padding feature. Transmit
frames will be padded to extend
them to 64 bytes including FCS.
The FCS is calculated for the en-
tire frame, including pad, and ap-
pended after the pad field. When
the auto padding logic modifies a
frame, a valid FCS field will be
appended to the frame, regard-
less of the state of the DXMTFCS
bit (CSR15, bit 3) and of the
ADD_FCS bit in the transmit de-
scriptor.
Read/Write
APAD_XMT
H_RESET or S_RESET and is
unaffected by the STOP bit.
ASTRP_RCV enables the auto-
matic pad stripping feature. The
pad and FCS fields will be
stripped from receive frames and
not placed in the FIFO.
Read/Write
ASTRP_RCV
H_RESET or S_RESET and is
unaffected by the STOP bit.
effect. Read as undefined.
Reserved Location. Written as
Disable Transmit Polling. If TXD-
Obsolete function. Writing has no
accessible.
is
is
cleared
cleared
P R E L I M I N A R Y
accessible.
accessible.
TXD-
Am79C976
by
by
8
7
6
5
4
3
2
MFCOM
UINTCMD
UINT
RCVCCO
RCVCCOM Obsolete function. Writing has no
TXSTRT
TXSTRTM
effect. Read as undefined.
UINTCMD can be used by the
host to generate an interrupt un
related to any network activity.
Writing a 1 to this bit causes
UINT to be set to 1, which in turn
causes INTA to be asserted if in-
Read/Write accessible. UINTC-
MD is always read as 0.
Read/Write accessible. UINT is
cleared by the host by writing a 1.
Writing a 0 has no effect. UINT is
cleared
S_RESET or by setting the STOP
bit.
When TXSTRT is set, INTA is as-
serted if IENA is 1 and the mask
bit TXSTRTM is 0.
Read/Write accessible. TXSTRT
is cleared by the host by writing a
1. Writing a 0 has no effect. TX-
STRT is cleared by H_RESET,
S_RESET, or by setting the
STOP bit.
Read/Write
STRTM is set to 1 by H_RESET
or S_RESET and is not affected
by the STOP bit.
Obsolete function. Writing has no
User
terrupts are enabled.
User Interrupt. UINT is set by the
Am79C976 controller after the
host has issued a user interrupt
command by setting UINTCMD
(CSR4, bit 7) to 1.
Obsolete function. Writing has no
effect. Read as undefined.
effect. Read as undefined.
Transmit Start status is set by the
Am79C976 controller whenever it
begins transmission of a frame.
Transmit Start Mask. If TX-
STRTM is set, the TXSTRT bit
will be masked and unable to set
the INTR bit.
Interrupt
by
accessible.
H_RESET
Command.
9/14/00
TX-
or