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參數(shù)資料
| 型號： | AM79C971VCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 中文描述： | 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176 |
| 封裝： | TQFP-176 |
| 文件頁數(shù)： | 113/265頁 |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971VCW |
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Am79C971
113
mapping can be done anywhere
in the 32-bit memory space.
0
MEMSPACE Memory space indicator. Read
as zero; write operations have no
effect. Indicates that this base ad-
dress register describes a memo-
ry base address.
PCI Subsystem Vendor ID Register
Offset 2Ch
The PCI Subsystem Vendor ID register is a 16-bit reg-
ister that together with the PCI Subsystem ID uniquely
identifies the add-in card or subsystem the Am79C971
controller is used in. Subsystem Vendor IDs can be ob-
tained from the PCI SIG. A value of 0 (the default) indi-
cates that the Am79C971 controller does not support
subsystem identification. The PCI Subsystem Vendor
ID is an alias of BCR23, bits 15-0. It is programmable
through the EEPROM.
The PCI Subsystem Vendor ID register is located at off-
set 2Ch in the PCI Configuration Space. It is read only.
PCI Subsystem ID Register
Offset 2Eh
The PCI Subsystem ID register is a 16-bit register that
together with the PCI Subsystem Vendor ID uniquely
identifies the add-in card or subsystem the Am79C971
controller is used in. The value of the Subsystem ID is
up to the system vendor. A value of 0 (the default) indi-
cates that the Am79C971 controller does not support
subsystem identification. The PCI Subsystem ID is an
alias of BCR24, bits 15-0. It is programmable through
the EEPROM.
The PCI Subsystem ID register is located at offset 2Eh
in the PCI Configuration Space. It is read only.
PCI Expansion ROM Base Address Register
Offset 30h
The PCI Expansion ROM Base Address register is a
32-bit register that defines the base address, size and
address alignment of an Expansion ROM. It is located
at offset 30h in the PCI Configuration Space.
Bit
Name
Description
31-20
ROMBASE Expansion ROM base address
most significant 12 bits. These
bits are written by the host to
specify the location of the Expan-
sion ROM in all of memory space.
ROMBASE must be written with a
valid
address
Am79C971 Expansion ROM ac-
cess is enabled by setting
ROMEN (PCI Expansion ROM
Base Address register, bit 0) and
before
the
MEMEN (PCI Command register,
bit 1).
Since the 12 most significant bits
of the base address are program-
mable, the host can map the Ex-
pansion
ROM
boundary.
on any 1M
When the Am79C971 controller
is enabled for Expansion ROM
access (ROMEN and MEMEN
are set to 1), it monitors the PCI
bus for a valid memory com-
mand. If the value on AD[31:2]
during the address phase of the
cycle falls between ROMBASE
and ROMBASE + 1M - 4, the
Am79C971 controller will drive
DEVSEL indicating it will respond
to the access.
ROMBASE is read and written by
the host. ROMBASE is cleared
by H_RESET and is not affected
by S_RESET or by setting the
STOP bit.
19-1
ROMSIZE
ROM size. Read as zeros; write
operation have no effect. ROM-
SIZE indicates the maximum size
of the Expansion ROM the
Am79C971 controller can sup-
port. The host can determine the
Expansion ROM size by writing
FFFF FFFFh to the Expansion
ROM Base Address register. It
will read back a value of 0 in bit
19-1, indicating an Expansion
ROM size of 1M.
Note that ROMSIZE only speci-
fies the maximum size of Expan-
sion
ROM
the
controller supports. A smaller
ROM can be used, too. The actu-
al size of the code in the Expan-
sion ROM is always determined
by reading the Expansion ROM
header.
Am79C971
0
ROMEN
Expansion ROM Enable. Written
by the host to enable access to
the
Expansion
Am79C971 controller will only re-
spond to accesses to the Expan-
sion ROM when both ROMEN
and MEMEN (PCI Command reg-
ister, bit 1) are set to 1.
ROM.
The
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相關代理商/技術參數(shù) |
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| AM79C972BKD/W | 制造商:Advanced Micro Devices 功能描述: |
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