Note (1): Loopback is from Serial I/P to Serial O/P. Recommended use for test purposes only; the lanes are swapped, and no pre-emphasis is perf" />
參數(shù)資料
型號: BBT3821-JH
廠商: Intersil
文件頁數(shù): 28/75頁
文件大小: 0K
描述: IC RE-TIMER OCTAL 192-BGA
標準包裝: 90
類型: 時鐘和數(shù)據(jù)恢復(CDR),多路復用器
PLL:
輸入: CML
輸出: CML,CMOS
電路數(shù): 1
比率 - 輸入:輸出: 8:8
差分 - 輸入:輸出: 是/是
頻率 - 最大: 3.1875Gbps
電源電壓: 1.425 V ~ 2.5 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 192-EBGA
供應商設備封裝: 192-EBGA-B(17x17)
包裝: 托盤
34
Note (1): Loopback is from Serial I/P to Serial O/P. Recommended use for test purposes only; the lanes are swapped, and no pre-emphasis is performed.
Note (2): These values may be overwritten by the Auto-Configure operation (See “Auto-Configuring Control Registers” on page 16 and Table 92 for details).
Note (1): Default values depend on setting of LX4/CX4 select LX4_MODE pin. LX4 value is shown firs
t. The values may be overwritten by the Auto-Configure operation
Note (1): See Figure 3 for illustration of the pre-emphasized waveform and meaning of symbols.
Note (2): This equation is the one used by the IEEE 802.3 CX4 Working Group when discussing pre-emphasis (alias Transmit equalization). The template normalization
factor of 0.69 in step 6) of IEEE 802.3akD5.3 Section 54.6.3.6 reflects 0.31 (31%) pre-emphasis according to this equation.
Note (3): This is the Default value set on power-up or RESET if the LX4/CX4 LX4_MODE pin is set for CX4 operation. This setting allows for a small loss in the PCB
traces and connectors before the IEEE 802.3akD5.3 defined TP2 compliance measurement point. The value may be overwritten by the Auto-Configure
Table 40. PMA SERIAL LOOP BACK CONTROL REGISTER
MDIO REGISTER ADDRESS = 1.49156 (1.C004’h)
BIT
NAME
SETTING
DEFAULT
R/W
DESCRIPTION
1.49156.15:13
Reserved
1.49156.12
PMA Test LP
1 = enable
0 = disable
0’h(1)
R/W
Serial Network Test Loopback
1.49156.11
PMA SLP_3
0’b(2)
R/W
PMA Serial Loop Back Enable for each individual
lane. When high, it routes the internal PMA Serial
output to the PMA Serial input.
1.49156.10
PMA SLP_2
0’b(2)
1.49156.9
PMA SLP_1
0’b(2)
1.49156.8
PMA SLP_0
0’b(2)
1.49156.7:0
Reserved
Table 41. PMA PRE-EMPHASIS CONTROL
MDIO REGISTER ADDRESS = 1.49157 (1.C005’h)
BIT
NAME
SETTING
DEFAULT(1)
R/W
DESCRIPTION
1.49157.15:12
PRE_EMP Lane 3
See Table 42 for
settings
00’h/07’h
R/W
Configure the level of PMA pre-emphasis
1.49157.11:8
PRE_EMP Lane 2
00’h/07’h
R/W
1.49157.7:4
PRE_EMP Lane 1
00’h/07’h
R/W
1.49157.3:0
PRE_EMP Lane 0
00’h/07’h
R/W
Table 42. PMA PRE-EMPHASIS CONTROL SETTINGS
(1)
ADDRESS
1.C005’h
BITS 3:0
PRE-EMPHASIS
(802.3ak) (2) =
(1-VLOW/VHI)
PRE-EMPHASIS
VALUE =
(VHI/ VLOW)-1
ADDRESS
1.C005’h
BITS 3:0
PRE-EMPHASIS
(802.3ak) (2) =
(1-VLOW/VHI)
PRE-EMPHASIS
VALUE =
(VHI/ VLOW)-1
0000
0%
0
1000
33.0%
0.493
0001
5.0%
0.053
1001
36.5%
0.575
0010
9.5%
0.105
1010
40.0%
0.667
0011
14.0%
0.163
1011
43.0%
0.754
0100
18.5%
0.227
1100
46.0%
0.852
0101
22.0%
0.282
1101
49.0%
0.961
0110
26.5%
0.361
1110
52.0%
1.083
0111(3)
30.0%
0.429
1111
54.5%
1.198
BBT3821
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