參數(shù)資料
型號(hào): AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 45/153頁
文件大小: 838K
代理商: AM79C974
P R E L I M I N A R Y
AMD
45
Am79C974
When SSIZE32 = 1, software data structures are 32 bits
wide. The following diagram illustrates, Figure 18, the
relationship between the Initialization Base Address,
the Initialization Block, the Receive and Transmit
Descriptor Ring Base Addresses, the Receive and
Transmit Descriptors and the Receive and Transmit
Data Buffers, for the case of SSIZE32 = 1.
Initialization
Block
RLEN
RES
32-Bit Base Address
Pointer to
Initialization Block
CSR1
IADR[15:0]
CSR2
IADR[31:16]
Rcv
Buffers
RMD0
RMD1RMD2
RMD3
Rcv Descriptor
Ring
N
N
N
N
1st desc.
start
2nd desc.
start
RMD0
Xmt
Buffers
RX DESCRIPTOR RINGS
1st desc.
start
TMD0
TMD1
TMD2
TMD3
RX DESCRIPTOR RINGS
Xmt Descriptor
M
M
M
M
2nd desc.
start
TMD0
Data
Buffer
N
Data
Buffer
1
Data
Buffer
2
Data
Buffer
M
Data
Buffer
2
Data
Buffer
1
PADR[31:0]
TLEN
RES
MODE
PADR[47:32]
RES
LADRF[31:0]
LADRF[63:32]
RDRA[31:0]
TDRA[31:0]
18681A-22
Figure 18
.
32-Bit Data Structures: Initialization Block and Descriptor Rings
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