參數(shù)資料
型號: AM79C960
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-ISA Single-Chip Ethernet Controller
中文描述: PCnetTM -的ISA單芯片以太網(wǎng)控制器
文件頁數(shù): 34/127頁
文件大?。?/td> 814K
代理商: AM79C960
P R E L I M I N A R Y
AMD
1-376
Am79C960
16907B-7
Initialization
Block
24-Bit Base Address
Pointer to
Initialization Block
IADR[15:0]
IADR[23:16]
RES
CSR1
CSR2
TDRA[15:0]
RES
MODE
PADR[15:0]
PADR[31:16]
PADR[47:32]
LADRF[15:0]
LADRF[31:16]
LADRF[47:32]
LADRF[63:48]
RDRA[15:0]
RES
RLEN
RDRA[23:16]
TLEN
TDRA[23:16]
RCV
Buffers
RX DESCRIPTOR RINGS
1st desc.
start
RMD0
RMD1RMD2
RMD3
RCV Descriptor
Ring
N
N
N
N
2nd desc.
start
RMD0
XMT
Buffers
RX DESCRIPTOR RINGS
1st desc.
start
TMD0
TMD1
TMD2
TMD3
RX DESCRIPTOR RINGS
XMT Descriptor
Ring
M
M
M
M
2nd desc.
start
TMD0
Data
Buffer
1
Data
Buffer
2
Data
Buffer
N
Data
Buffer
1
Data
Buffer
2
Data
Buffer
M
16907B-7
Initialization Block and Descriptor Rings
Polling
When there is no channel activity and there is no pre- or
post-receive or transmit activity being performed by the
PCnet-ISA controller, then the PCnet-ISA controller will
periodically poll the current receive and transmit de-
scriptor entries in order to ascertain their ownership. If
the DPOLL bit in CSR4 is set, then the transmit polling
function is disabled.
A typical polling operation consists of the following: The
PCnet-ISA controller will use the current receive de-
scriptor address stored internally to vector to the
appropriate Receive Descriptor Table Entry (RDTE). It
will then use the current transmit descriptor address
(stored internally) to vector to the appropriate Transmit
Descriptor Table Entry (TDTE). These accesses will be
made to RMD1 and RMD0 of the current RDTE and
TMD1 and TMD0 of the current TDTE at periodic polling
intervals. All information collected during polling activity
will be stored internally in the appropriate CSRs. (i.e.
CSR18–19, CSR20–21, CSR40, CSR42, CSR50,
CSR52). UnOWNed descriptor status will be internally
ignored.
相關(guān)PDF資料
PDF描述
AM79C960KC PCnetTM-ISA Single-Chip Ethernet Controller
AM79C960KCW PCnetTM-ISA Single-Chip Ethernet Controller
AM79C961AKCW PCnet ⑩-ISA II Jumperless, Full Duplex Single-Chip Ethernet Controller for ISA
AM79C961AKC PCnet ⑩-ISA II Jumperless, Full Duplex Single-Chip Ethernet Controller for ISA
AM79C961A PCnet ⑩-ISA II Jumperless, Full Duplex Single-Chip Ethernet Controller for ISA
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參數(shù)描述
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