參數(shù)資料
型號(hào): 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(lán)的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 70/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
Register 1D: Auto Negotiation Control (AutoNegCTL, Read/Write)
F
E
D
ForceFDX
Address: PacketPage base + 011Ch
8
7
AutoNeg
Enable
C
B
A
9
6
5-0
NLP
Enable
AllowFDX
ReNOW
011101
BIT
NAME
DESCRIPTION
5-0
011101
These bits provide an internal address used by the CS8920A to identify this as the Test
Control Register.
6
ReNOW
When set, and when NLPEnable and ForceFDX are not set, a re-negotiation is forced.
ReNOW clears itself after re-negotiation begins. Reset value is 0.
7
AllowFDX
When set, the FDX mode is advertised. AllowFDX is sampled only when entering the
Ability Detect state during arbitration. Changes to this bit are ignored after arbitration
begins. To re-sample this bit, a re-negotiation must be forced.
8
AutoNegEnable When set, and when NLPEnable and ForceFDX are not set, auto negotiation may
occur, including using fast link pulses. When AutoNegEnable is clear, negotiations are
aborted, including the negotiation in progress. Reset value is 0. When AutoNegEnable
bit is cleared, set bit ReNOW.
9
NLPEnable
When set, the normal link pulses will be transmitted and auto negotiation will be
disabled. Reset value is 0.
F
ForceFDX
(10BASE-T,
only)
This bit is used to force full duplex operation. The FDXLED output is asserted to show
that full duplex operation is being used. FDXactive is also set and auto negotiation
capability will be disabled. When ForceFDX is clear, the full duplex operation is not
forced, but the CS8920A may be in full duplex due to auto negotiation.
NOTE:
One of the bits, either F, 9, or 8, must be set to allow a link to be established. If none of the bits are set,
no link pulses of any kind will be sent, and the transmitter will be disabled.
This register’s initial state after reset is:
0000 0000
0001 1101
CS8920A
70
DS238PP2
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