AC Requirements for SGMII
參數(shù)資料
型號： MPC8313E-RDB
廠商： Freescale Semiconductor
文件頁數(shù)： 22/99頁
文件大?。?/td> 0K
描述： BOARD PROCESSOR
產(chǎn)品培訓(xùn)模塊： MPC8313E PowerQUICC Processor
MPC8314/15 Product Overview
標(biāo)準(zhǔn)包裝： 1
系列： PowerQUICC II™ PRO
類型： MCU
適用于相關(guān)產(chǎn)品： MPC8313E
所含物品： 參考設(shè)計板、軟件和說明文檔
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MPC8313E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
29
8.3.2
AC Requirements for SGMII SD_REF_CLK and SD_REF_CLK
This table lists the SGMII SerDes reference clock AC requirements. Note that SD_REF_CLK and
SD_REF_CLK are not intended to be used with, and should not be clocked by, a spread spectrum clock
source.
8.3.3
SGMII Transmitter and Receiver DC Electrical Characteristics
Table 32 and Table 33 describe the SGMII SerDes transmitter and receiver AC-coupled DC electrical
characteristics. Transmitter DC characteristics are measured at the transmitter outputs (SD_TX[n] and
SD_TX[n]) as depicted in Figure 16.
Table 31. SD_REF_CLK and SD_REF_CLK AC Requirements
Symbol
Parameter Description
Min
Typ
Max
Unit
tREF
REFCLK cycle time
—
8
—
ns
tREFCJ
REFCLK cycle-to-cycle jitter. Difference in the period of any two
adjacent REFCLK cycles
——
100
ps
tREFPJ
Phase jitter. Deviation in edge location with respect to mean
edge location
–50
—
50
ps
Table 32. SGMII DC Transmitter Electrical Characteristics
Parameter
Symbol
Min
Typ
Max
Unit
Note
Supply voltage
XCOREVDD
0.95
1.0
1.05
V
Output high voltage
VOH
—
XCOREVDD-Typ/2
+|VOD|-max/2
mV
1
Output low voltage
VOL
XCOREVDD-Typ/2
– |VOD|-max/2
——
mV
1
Output ringing
VRING
——
10
%
Output differential voltage2, 3
|VOD|
323
500
725
mV
Equalization
setting: 1.0x
Output offset voltage
VOS
425
500
575
mV
1, 4
Output impedance
(single-ended)
RO
40
—
60
Mismatch in a pair
R
O
——
10
%
Change in VOD between 0 and 1
|V
OD|—
—
25
mV
Change in VOS between 0 and 1
V
OS
——
25
mV
Output current on short to GND
ISA, ISB
——
40
mA
Notes:
1. This will not align to DC-coupled SGMII. XCOREVDD-Typ = 1.0 V.
2. |VOD| = |VTXn – VTXn|. |VOD| is also referred as output differential peak voltage. VTX-DIFFp-p = 2*|VOD|.
3. The |VOD| value shown in the Typ column is based on the condition of XCOREVDD-Typ = 1.0 V, no common mode offset
variation (VOS = 500 mV), SerDes transmitter is terminated with 100- differential load between TX[n] and TX[n].
4. VOS is also referred to as output common mode voltage.
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