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參數(shù)資料
| 型號： | AM79C972 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| 中文描述： | PCnet⑩與OnNow增強10/100 Mbps的快速以太網(wǎng)控制器支持的PCI |
| 文件頁數(shù)： | 103/130頁 |
| 文件大?。?/td> | 1580K |
| 代理商： | AM79C972 |
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Am79C972
103
the host. It is cleared by H_RESET and is not affected
by S_RESET or by setting the STOP bit.
PCI Interrupt Pin Register
Offset 3Dh
This PCI Interrupt Pin register is an 8-bit register that
indicates the interrupt pin that the Am79C972 controller
is using. The value for the Am79C972 Interrupt Pin reg-
ister is 01h, which corresponds to INTA.
The PCI Interrupt Pin register is located at offset 3Dh
in the PCI Configuration Space. It is read only.
PCI MIN_GNT Register
Offset 3Eh
The PCI MIN_GNT register is an 8-bit register that
specifies the minimum length of a burst period that the
Am79C972 device needs to keep up with the network
activity. The length of the burst period is calculated as-
suming a clock rate of 33 MHz. The register value spec-
ifies the time in units of 1/4
μ
s. The PCI MIN_GNT
register is an alias of BCR22, bits 7-0. It is recom-
mended that the BCR22 be programmed to a value of
1818h.
The host should use the value in this register to deter-
mine the setting of the PCI Latency Timer register.
The PCI MIN_GNT register is located at offset 3Eh in
the PCI Configuration Space. It is read only.
PCI MAX_LAT Register
Offset 3Fh
The PCI MAX_LAT register is an 8-bit register that spec-
ifies the maximum arbitration latency the Am79C972
controller can sustain without causing problems to the
network activity. The register value specifies the time in
units of 1/4 μs. The MAX_LAT register is an alias of
BCR22, bits 15-8. It is recommended that BCR22 be
programmed to a value of 1818h.
The host should use the value in this register to deter-
mine the setting of the PCI Latency Timer register.
The PCI MAX_LAT register is located at offset 3Fh in
the PCI Configuration Space. It is read only
PCI Capability Identifier Register
Offset 40h
Bit
Name
Description
7-0
CAP_ID
This register, when set to 1, iden-
tifies the linked list item as being
the PCI Power Management reg-
isters. This register has a default
value of 1h.
The PCI Capabilities Identifier
register is located at offset 40h in
the PCI Configuration Space. It is
read only.
PCI Next Item Pointer Register
Offset 41h
Bit
Name
Description
7-0
NXT_ITM_PTR
The Next Item Pointer Register
points to the starting address of
the next capability. The pointer at
this offset is a null pointer, indi-
cating that this is the last capabil-
ity in the linked list of the
capabilities. This register has a
default value of 0h.
The PCI Next Pointer Register is
located at offset 41h in the PCI
Configuration Space. It is read
only.
PCI Power Management Capabilities Register
(PMC)
Offset 42h
Note:
All bits of this register are loaded from
EEPROM. The register is aliased to BCR36 for testing
purposes.
Bit
Name
Description
15-11
PME_SPT
PME Support. This 5-bit field indi-
cates the power states in which
the function may assert PME. A
value of 0b for any bit indicates
that the function is not capable of
asserting the PME signal while in
that power state.
Bit(11) XXXX1b - PME can be
asserted from D0.
Bit(12) XXX1Xb - PME can be
asserted from D1.
Bit(13) XX1XXb - PME can be
asserted from D2.
Bit(14) X1XXXb - PME can be
asserted from D3hot.
Bit(15) 1XXXXb - PME can be
asserted from D3cold.
Read only.
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PDF描述 |
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| AM79C972BVIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C974 | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems |
| AM79C974KCW | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C972BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKD/W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKD\\W | 制造商:Advanced Micro Devices 功能描述: |
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