MPC8378E-MDS-PB Freescale Semiconductor, MPC8378E-MDS-PB Datasheet - Page 30
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MPC8378E-MDS-PB
Manufacturer Part Number
MPC8378E-MDS-PB
Description
BOARD PROCESSOR FOR MDS S
Manufacturer
Freescale Semiconductor
Type
MPUr
Specifications of MPC8378E-MDS-PB
Contents
Board
For Use With/related Products
MPC8378
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
8.3.2
Table 30
intended to be used with, and should not be clocked by, a spread spectrum clock source.
8.3.3
This section describes the MII transmit and receive AC timing specifications.
8.3.3.1
Table 31
At recommended operating conditions with LV
30
L1_SD_REF_CLK/_B reference clock cycle time
L1_SD_REF_CLK/_B rise/fall time (80%-20%)
L1_SD_REF_CLK/_B duty cycle (@50% L1_nV
L1_SD_REF_CLK/_B cycle to cycle clock jitter (period
jitter)
L1_SD_REF_CLK/_B phase jitter peak-to-peak.
Deviation in edge location with respect to mean edge
location.
Note:
1
2
TX_CLK clock period 10 Mbps
TX_CLK clock period 100 Mbps
TX_CLK duty cycle
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
Both options provide serial interface bit rate of 1.25 Gbps. 8 ns only applies when 125 MHz SerDes1 clock frequency is
selected during POR.
Tolerance of ±100 ppm.
lists the AC timing specifications. Note that L1_SD_REF_CLK and L1_SD_REF_CLK are not
provides the MII transmit AC timing specifications.
AC Requirements for SGMII L1_SD_REF_CLK and L1_SD_REF_CLK
MII AC Timing Specifications
MII Transmit AC Timing Specifications
Parameter/Condition
Table 30. L1_SD_REF_CLK and L1_SD_REF_CLK AC Requirements
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4
Parameter
Table 31. MII Transmit AC Timing Specifications
DD
of 3.3 V ± 5%.
100 MHz
125 MHz
DD
)
t
CK_RISE
Symbol
t
CK_REF
t
t
t
t
ck_dty
Symbol
MTXH/
CKPJ
CKCJ
t
MTKHDX
/t
t
t
MTX
MTX
CK_FALL
t
MTX
1
45%
Min
–50
—
—
—
Min
—
—
35
1
Typical
10
—
—
—
—
8
Typical
400
40
—
5
Freescale Semiconductor
55%
Max
100
50
—
1
Max
65
15
—
—
Unit
ns
ns
ps
ps
ps
Unit
Notes
ns
ns
ns
%
1, 2
—
—
—
—
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