lxt9781 Intel Corporation, lxt9781 Datasheet - Page 76

• Manufacturer Part Number: lxt9781
• Description: Fast Ethernet 10/100 Multi-port Transceiver With Rmii
• Manufacturer: Intel Corporation

LXT9761/9781 — Fast Ethernet 10/100 Multi-Port Transceiver with RMII
76
28.15:4
28.3:2
28.1:0
30.15:14
30.13
30.12:0
1. Transmit Control functions are approximations. They are not guaranteed and not subject to production testing.
2. RO = Read Only.
3. The default setting of bits 28.1:0 (Risetime) are determined by pins 91 and 94.
1. RO = Read Only.
R/W = Read/Write.
Table 50. Transmit Control Register #1 (Address 28)
Table 51. Transmit Control Register #2 (Address 30)
Bit
Bit
Reserved
Bandwidth
Control
Risetime
Control
Reserved
Increase Driver
Amplitude
Reserved
Name
Name
Ignore.
00 = Nominal Differential Amp Bandwidth
01 = Slower
10 = Fastest
11 = Faster
00 = 2.5ns
01 = 3.1ns
10 = 3.7ns
11 = 4.3ns
1 = Increase Driver Amplitude 5% in all modes.
0 = Normal operation.
Description
Description
Type
R/W
R/W
R/W
Type
R/W
R/W
R/W
Datasheet
2
Default
Default
Note 3
N/A
N/A
N/A
00
0