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參數(shù)資料
| 型號： | CDK8920A |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER |
| 中文描述： | 水晶藍的ISA即插即用，即插即用以太網(wǎng)控制器 |
| 文件頁數(shù)： | 51/144頁 |
| 文件大?。?/td> | 1229K |
| 代理商： | CDK8920A |
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Register 3: Receiver Configuration (RxCFG, Read/Write)
Address: PacketPage base + 0102h
F
E
D
C
B
A
9
8
7
6
5-0
Extra
dataiE
RuntiE
CRC
erroriE
Buffer
CRC
AutoRx
DMAE
RxDMA
only
RxOKiE
StreamE
Skip_1
000011
RxCFG determines how frames will be transferred to the host and what frame types will cause interrupts.
BIT
NAME
DESCRIPTION
5-0
000011
These bits provide an internal address used by the CS8920A to identify this as the
Receiver Configuration Register.
6
Skip_1
When set, this bit causes the last committed received frame to be deleted from the
receive buffer. To skip another frame, the host must rewrite a 1 to this bit. This bit is
not to be used if RxDMAonly (Bit 9) is set. Skip_1 is an Act-Once bit. See Section 5.2.5
7
StreamE
When set, StreamTransfer mode is used to transfer receive frames that are back-to-
back andthat pass the Destination Address filter (see Section 5.3). When StreamE is
clear, StreamTransfer mode is not used. This bit must not be set unless either bit
AutoRXDMA or bit RXDMA-only is set. When StreamTransfer mode is used Rx128iE
(bit B) & RxDestiE (bit F) in the buffer configuration register (Register B) must be clear.
8
RxOKiE
When set, there is an RxOK Interrupt if a frame is received without errors.
9
RxDMAonly
When set, the Receive-DMA mode is used for all receive frames.
A
AutoRxDMAE
When set, the CS8920A will automatically switch to Receive-DMA mode if the
conditions specified in Section 5.6 are met. RxDMAonly (Bit 9) has precedence over
AutoRxDMAE.
B
BufferCRC
When set, the received CRC is included with the data stored in the receive-frame
buffer, and the four CRC bytes are included in the receive-frame length (PacketPage
base + 0402h). When clear, neither the receive buffer nor the receive length include
the CRC.
C
CRCerroriE
When set, there is a CRCerror Interrupt if a frame is received with a bad CRC.
D
RuntiE
When set, there is a Runt Interrupt if a frame is received that is shorter than 64 bytes.
The CS8920A always discards any frame that is shorter than 8 bytes.
E
ExtradataiE
When set, there is an Extradata Interrupt if a frame is received that is longer than
1518 bytes. The operation of this bit is independent of the received packet integrity
(good or bad CRC).
After reset, if no EEPROM is found by the CS8920A, the register has the following initial state. If an EEPROM is
found, the register’s initial value may be set by the EEPROM. See Section 3.3.
0000 0000
0000 0011
CS8920A
DS238PP2
51
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