AC Requirements for SGMII
參數(shù)資料
型號: MPC8313E-RDBB
廠商: Freescale Semiconductor
文件頁數(shù): 22/99頁
文件大小: 0K
描述: BOARD CPU 8313E VER 2.1
標(biāo)準(zhǔn)包裝: 1
系列: PowerQUICC II™ PRO
類型: MPU
適用于相關(guān)產(chǎn)品: MPC8313E
所含物品:
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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