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參數資料
| 型號： | AM79C971KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| 中文描述： | 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁數： | 95/265頁 |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971KCW |
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Am79C971
95
If the user wishes to modify any of the configuration bits
that are contained in the EEPROM, then the seven
command, data and status bits of BCR19 can be used
to write to the EEPROM. After writing to the EEPROM,
the host should set the PREAD bit of BCR19. This
action forces an Am79C971 controller reread of the
EEPROM so that the new EEPROM contents will be
loaded into the EEPROM-programmable registers on
board the Am79C971 controller. (The EEPROM-pro-
grammable registers may also be reprogrammed di-
rectly, but only information that is stored in the
EEPROM will be preserved at system power-down.)
When the PREAD bit of BCR19 is set, it will cause the
Am79C971 controller to ignore further accesses to the
Am79C971 configuration space, the Expansion ROM,
or any I/O resource until the completion of the EE-
PROM read operation. The Am79C971 controller will
terminate these access attempts with the assertion of
DEVSEL and STOP while TRDY is not asserted, sig-
naling to the initiator to disconnect and retry the access
at a later time.
EEPROM Auto-Detection
The Am79C971 controller uses the EESK/LED1/SFBD
pin to determine if an EEPROM is present in the sys-
tem. At the rising edge of CLK during the last clock dur-
ing which RST is asserted, the Am79C971 controller
will sample the value of the EESK/LED1/SFBD pin. If
the sampled value is a 1, then the Am79C971 controller
assumes that an EEPROM is present, and the EE-
PROM read operation begins shortly after the RST pin
is deasserted. If the sampled value of EESK/LED1/
SFBD is a 0, the Am79C971 controller assumes that an
external pulldown device is holding the EESK/LED1/
SFBD pin low, indicating that there is no EEPROM in
the system. Note that if the designer creates a system
that contains an LED circuit on the EESK/LED1/SFBD
pin, but has no EEPROM present, then the EEPROM
auto-detection function will incorrectly conclude that an
EEPROM is present in the system. However, this will
the checksum verification will fail.
Direct Access to the Interface
The user may directly access the port through the
EEPROM register, BCR19. This register contains bits
that can be used to control the interface pins. By per-
forming an appropriate sequence of accesses to
BCR19, the user can effectively write to and read from
the EEPROM. This feature may be used by a system
configuration utility to program hardware configuration
information into the EEPROM.
EEPROM-Programmable Registers
The following registers contain configuration informa-
tion that will be programmed automatically during the
EEPROM read operation:
I
I/O offsets 0h-Fh
I
BCR2
I
BCR4
I
BCR5
I
BCR6
I
BCR7
I
BCR9
I
BCR18
I
BCR22
I
BCR23
I
BCR24
I
BCR25
I
BCR26
I
BCR27
I
BCR32
I
BCR33
I
BCR35
Address PROM locations
Miscellaneous Configuration
LED0 Status
LED1 Status
LED2 Status
LED3 Status
Full-Duplex Control
Burst and Bus Control
PCI Latency
PCI Subsystem Vendor ID
PCI Subsystem ID
SRAM Size
SRAM Boundary
SRAM Interface Control
MII Control and Status
MII Address
PCI Vendor ID
If PREAD (BCR19, bit 14) and PVALID (BCR19, bit 15)
are cleared to 0, then the EEPROM read has experi-
enced a failure and the contents of the EEPROM pro-
grammable BCR register will be set to default
H_RESET values. The content of the Address PROM
locations, however, will not be cleared.
Note that accesses to the Address PROM I/O locations
do not directly access the Address EEPROM itself. In-
stead, these accesses are routed to a set of shadow
registers on board the Am79C971 controller that are
loaded with a copy of the EEPROM contents during the
automatic read operation that immediately follows the
H_RESET operation.
EEPROM MAP
The automatic EEPROM read operation will access 32
words (i.e., 64 bytes) of the EEPROM. The format of
the EEPROM contents is shown in Table 14, beginning
with the byte that resides at the lowest EEPROM ad-
dress.
Note that the first bit out of any word location in the EE-
PROM is treated as the MSB of the register being pro-
grammed. For example, the first bit out of EEPROM
word location 09h will be written into BCR4, bit 15; the
second bit out of EEPROM word location 09h will be
written into BCR4, bit 14, etc.
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相關代理商/技術參數 |
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| AM79C971VCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
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| AM79C972BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
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| 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 |
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