mpc8308 Freescale Semiconductor, Inc, mpc8308 Datasheet - Page 28
mpc8308
Manufacturer Part Number
mpc8308
Description
Mpc8308 Powerquicc Ii Pro Processor Hardware Specification
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MPC8308.pdf
(88 pages)
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High-Speed Serial Interfaces (HSSI)
10.2.3
With on-chip termination to XCOREVSS, the differential reference clocks inputs are high-speed current
steering logic (HCSL)-compatible and DC-coupled.
Many other low-voltage differential type outputs like low-voltage differential signaling (LVDS) can be
used but may need to be AC-coupled due to the limited common mode input range allowed (100–400 mV)
for DC-coupled connection.
LVPECL outputs can produce signal with too large amplitude and may need to be DC-biased at clock
driver output first, then followed with series attenuation resistor to reduce the amplitude, in addition to
AC-coupling.
28
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
Figure 17. Differential Reference Clock Input DC Requirements (External DC-Coupled)
Figure 18. Differential Reference Clock Input DC Requirements (External AC-Coupled)
Interfacing with Other Differential Signaling Levels
SD_REF_CLK
SD_REF_CLK
Figure 19. Single-Ended Reference Clock Input DC Requirements
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1
200mV < Input Amplitude or Differential Peak < 800mV
200 mV < Input Amplitude or Differential Peak < 800 mV
400 mV < SD_REF_CLK Input Amplitude < 800 mV
100 mV < Vcm < 400 mV
Vmin > Vcm – 400 mV
Vmax < Vcm + 400 mV
0 V
Freescale Semiconductor
Vmax < 80 0mV
Vmin > 0 V
Vcm