參數(shù)資料
型號: XRS10L120
廠商: Exar Corporation
英文描述: SERIAL ATA II: 1:2 PORT MULTIPLIER
中文描述: 串行ATA II:1:2端口倍增器
文件頁數(shù): 13/52頁
文件大?。?/td> 399K
代理商: XRS10L120
PRELIMINARY
XRS10L120
11
REV. P1.0.1
SERIAL ATA II: 1:2 PORT MULTIPLIER
2.6
Clocking
The XRS10L120 allows the use of either an external reference clock or of a low cost crystal oscillator to act as
a reference clock. Separate device inputs are available for each approach, with full rate reference clock inputs
provided on pins CMU_REFP and CMU_REFN, and crystal oscillator inputs provided on pins XOD and XOG.
Supported data rates and their appropriate PLL divide factors are outlined in
Table 2
.
N
OTE
:
* All link start with 3.0Gbps, then negotiate down to 1.5Gbps for SATA Generation 1 devices.
2.6.1
Spread Spectrum Clocking
The XRS10L120 provides full support for receipt and generation of signals that have been configured for
Spread Spectrum Clocking (SSC) support. The spread technique is implemented by down-spreading the data
rate by 0.5% as a means of reducing EMI. Generation of the down-spread clock is performed within the
XRS10L120. An example of the resultant spectral fundamental frequency before and after SSC can be seen in
Figure 9
.
T
ABLE
2: PLL D
IVIDE
F
ACTORS
M
ODE
CMU_REF
OR
XO
FREQ
/REF
(
REG
N.0041)
/FB
(
REG
N.0040)
D
ATA
R
ATE
SATA Gen. 1
25MHz
1
30
1.5Gbps*
SATA Gen. 1
75MHz
1
10
1.5Gbps*
SATA Gen. 1
100MHz
2
15
1.5Gbps*
SATA Gen. 1
150MHz
1
5
1.5Gbps*
SATA Gen. 2
25MHz
1
60
3.0Gbps
SATA Gen. 2
75MHz
1
20
3.0Gbps
SATA Gen. 2
100MHz
2
30
3.0Gbps
SATA Gen. 2
150MHz
1
10
3.0Gbps
F
IGURE
9. S
PREAD
S
PECTRUM
C
LOCKING
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