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參數(shù)資料
| 型號： | AM79C973 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| 中文描述： | PCnet⑩快速三單芯片10/100 Mbps的PCI以太網(wǎng)控制器集成PHY |
| 文件頁數(shù)： | 191/304頁 |
| 文件大?。?/td> | 2092K |
| 代理商： | AM79C973 |
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Am79C973/Am79C975
191
P R E L I M I N A R Y
BCR44: PCI DATA Register Seven (DATA7) Alias
Register
Note:
This register is an alias of the DATA register and
also of the DATA_SCALE field of the PCMCR register.
Since these two are read only, BCR44 provides a
means of programming them through the EEPROM.
The contents of this register are copied into the corre-
sponding fields pointed with the DATA_SEL field set to
seven. Bits 15-0 in this register are programmable
through the EEPROM.
Bit
Name
Description
15-10 RES
Reserved locations. Written as
zeros and read as undefined.
9-8
D7_SCALE
These bits correspond to the
DATA_SCALE field of the PMC-
SR (offset Register 44 of the PCI
configuration space, bits 14-13).
Refer to the description of
DATA_SCALE for the meaning of
this field.
Read
D7_SCALE is read only. Cleared
by H_RESET and is not affected
by S_RESET or setting the STOP
bit.
accessible
always.
7-0
DATA7
These bits correspond to the PCI
DATA register (offset register 47
of the PCI configuration space,
bits 7-0). Refer to the description
of DATA register for the meaning
of this field.
Read accessible always. DATA7
is
read
only.
H_RESET and is not affected by
S_RESET or setting the STOP
bit.
Cleared
by
BCR45: OnNow Pattern Matching Register 1
Note:
This register is used to control and indirectly ac-
cess the Pattern Match RAM (PMR). When BCR45 is
written and the PMAT_MODE bit (bit 7) is 1, Pattern
Match logic is enabled. No bus accesses into PMR are
possible, and BCR46, BCR47, and all other bits in
BCR45 are ignored. When PMAT_MODE is set, a read
of BCR45, BCR46, or BCR47 returns all undefined bits
except for PMAT_MODE.
When BCR45 is written and the PMAT_MODE bit is 0,
the Pattern Match logic is disabled and accesses to the
PMR are possible. Bits 6-0 of BCR45 specify the ad-
dress of the PMR word to be accessed. Following the
write to BCR45, the PMR word may be read by reading
BCR45, BCR46 and BCR47 in any order. To write to
PMR word, the write to BCR45 must be followed by a
write to BCR46 and a write to BCR47 in that order to
complete the operation. The RAM will not actually be
written until the write to BCR47 is complete. The write
to BCR47 causes all 5 bytes (four bytes of BCR46-47
and the upper byte of the BCR45) to be written to what-
ever PMR word is addressed by bits 6:0 of BCR45.
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-8
PMR_B0
Pattern Match RAM Byte 0. This
byte is written into or read from
Byte 0 of the Pattern Match RAM
Read and write accessible al-
ways. PMR_B0 is undefined after
H_RESET, and is unaffected by
S_RESET and the STOP bit.
7
PMAT_MODEPattern Match Mode. Writing a 1 to
this bit will enable Pattern Match
Mode and should only be done
after the Pattern Match RAM has
been programmed.
Read and write accessible al-
ways. PMAT_MODE is reset to 0
after H_RESET, and is unaffect-
ed by S_RESET and the STOP
bit.
6-0
PMR_ADDRPattern Match Ram Address. These
bits are the Pattern Match Ram
address to be written to or read
from.
Read and write accessible al-
ways. PMR_ADDR is reset to 0
after H_RESET, and is unaffect-
ed by S_RESET and the STOP
bit.
BCR46: OnNow Pattern Matching Register 2
Note:
This register is used to control and indirectly ac-
cess the Pattern Match RAM (PMR). When BCR45 is
written and the PMAT_MODE bit (bit 7) is 1, Pattern
Match logic is enabled. No bus accesses into PMR are
possible, and BCR46, BCR47, and all other bits in
BCR45 are ignored. When PMAT_MODE is set, a read
of BCR45, BCR46, or BCR47 returns all undefined bits
except for PMAT_MODE.
When BCR45 is written and the PMAT_MODE bit is 0,
the Pattern Match logic is disabled and accesses to the
PMR are possible. Bits 6-0 of BCR45 specify the ad-
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| AM79C973AVC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C973AVC\W | 制造商:Advanced Micro Devices 功能描述: |
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