Datasheet

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor 15
DUART
This figure provides the AC test load for the DDR2 bus.
Figure 7. DDR2 AC Test Load
7DUART
This section describes the DC and AC electrical specifications for the DUART interface.
7.1 DUART DC Electrical Characteristics
This table provides the DC electrical characteristics for the DUART interface.
7.2 DUART AC Electrical Specifications
This table provides the AC timing parameters for the DUART interface.
8 Ethernet: Three-Speed Ethernet, MII Management
This section provides the AC and DC electrical characteristics for three-speed, 10/100/1000, and MII
management. MPC8308 supports dual Ethernet controllers.
Table 19. DUART DC Electrical Characteristics
Parameter Symbol Min Max Unit
High-level input voltage V
IH
2.1 NV
DD
+ 0.3 V
Low-level input voltage NVDD V
IL
–0.3 0.8 V
High-level output voltage, I
OH
= –100 AV
OH
NV
DD
– 0.2 — V
Low-level output voltage, I
OL
= 100 AV
OL
—0.2 V
Input current (0 V V
IN
NV
DD
)I
IN
—± 5A
Table 20. DUART AC Timing Specifications
Parameter Value Unit Notes
Minimum baud rate 256 baud —
Maximum baud rate > 1,000,000 baud 1
Oversample rate 16 — 2
Notes:
1. Actual attainable baud rate is limited by the latency of interrupt processing.
2. The middle of a start bit is detected as the 8
th
sampled 0 after the 1-to-0 transition of the start bit.
Subsequent bit values are sampled each 16
th
sample.
Output
Z
0
= 50 
R
L
= 50 
GV
DD
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