參數(shù)資料
型號(hào): IXF440
英文描述: LAN HUB CONTROLLER
中文描述: 局域網(wǎng)集線器控制器
文件頁數(shù): 31/100頁
文件大小: 1354K
代理商: IXF440
IXF440 Multiport 10/100 Mbps Ethernet Controller
Datasheet
31
3.2.3
Configuration Registers
The following sections describe the individual configuration registers.
3.2.3.1
FIFO Threshold Register
The FIFO threshold register handles the transmit and receive FIFO threshold.
Bit Name
Bit Number
Bit Description
TTH
7:4
This field defines the minimum amount of free space required in the transmit
FIFO in order to assert the txrdy signal. The effective threshold in bytes is
equal to 8
×
(TTH + 1). A value of 0 is not allowed.
RTH
3:0
This field defines the minimum amount of data required in the receive FIFO
in order to assert the rxrdy signal. The effective threshold in bytes is equal to
8
×
(RTH + 1). A value of 0 is not allowed.
Access Rules
Register access
R/W
Value after reset
77H
Register field value
(RTH or TTH)
Effective threshold
(bytes)
Register field value
(RTH or TTH)
Effective threshold
(bytes)
0
not allowed
8
72
1
16
9
80
2
24
10
88
3
32
11
96
4
40
12
104
5
48
13
112
6
56
14
120
7
64
15
128
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