Local Bus
9 Local Bus
This section describes the DC and AC electrical specifications for the local bus interface of the MPC8540.
9.1 Local Bus DC Electrical Characteristics
provides the DC electrical characteristics for the local bus interface.
Table 35. Local Bus DC Electrical Characteristics
Parameter
High-level input voltage
Low-level input voltage
Input current
(V
IN 1
= 0 V or V
IN
= V
DD
)
High-level output voltage
(OV
DD
= min, I
OH
= –2 mA)
Low-level output voltage
(OV
DD
= min, I
OL
= 2 mA)
Symbol
V
IH
V
IL
I
IN
V
OH
V
OL
Min
2
–0.3
—
Max
OV
DD
+ 0.3
0.8
±5
Unit
V
V
μA
OV
DD
- 0.2
—
—
V
0.2
V
Note:
1.Note that the symbol V
IN
, in this case, represents the OV
IN
symbol referenced in
and
9.2 Local Bus AC Electrical Specifications
describes the general timing parameters of the local bus interface of the MPC8540 with the DLL
enabled.
Table 36. Local Bus General Timing Parameters - DLL Enabled
Parameter
Local bus cycle time
LCLK[n] skew to LCLK[m] or
LSYNC_OUT
Input setup to local bus clock
(except LUPWAIT)
LUPWAIT input setup to local bus
clock
Input hold from local bus clock
(except LUPWAIT)
LUPWAIT input hold from local bus
clock
LALE output transition to LAD/LDP
output transition (LATCH hold time)
POR Configuration
Symbol
1
t
LBK
t
LBKSKEW
t
LBIVKH1
t
LBIVKH2
t
LBIXKH1
t
LBIXKH2
t
LBOTOT
Min
6.0
—
1.8
1.7
0.5
1.0
1.5
Max
—
150
—
—
—
—
—
Unit
ns
ps
ns
ns
ns
ns
ns
Notes
2
3, 9
4, 5, 8
4, 5
4, 5, 8
4, 5
6
MPC8540 Integrated Processor Hardware Specifications, Rev. 4
36
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
