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
Table 35 provides the DC electrical characteristics for the local bus interface.
Table 35. Local Bus DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
High-level input voltage
Low-level input voltage
VIH
VIL
IIN
2
OVDD + 0.3
V
V
–0.3
—
0.8
5
Input current
(VIN 1 = 0 V or VIN = VDD
μA
)
High-level output voltage
VOH
OVDD - 0.2
—
—
V
V
(OVDD = min, IOH = –2 mA)
Low-level output voltage
(OVDD = min, IOL = 2 mA)
VOL
0.2
Note:
1.Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.
9.2 Local Bus AC Electrical Specifications
Table 36 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
POR Configuration
Symbol 1
Min
Max
Unit
Notes
tLBK
6.0
—
—
ns
ps
2
LCLK[n] skew to LCLK[m] or
LSYNC_OUT
tLBKSKEW
150
3, 9
Input setup to local bus clock
(except LUPWAIT)
tLBIVKH1
tLBIVKH2
tLBIXKH1
tLBIXKH2
tLBOTOT
1.8
1.7
0.5
1.0
1.5
—
—
—
—
—
ns
ns
ns
ns
ns
4, 5, 8
4, 5
LUPWAIT input setup to local bus
clock
Input hold from local bus clock
(except LUPWAIT)
4, 5, 8
4, 5
LUPWAIT input hold from local bus
clock
LALE output transition to LAD/LDP
output transition (LATCH hold time)
6
MPC8540 Integrated Processor Hardware Specifications, Rev. 4
36
Freescale Semiconductor
FREESCALE [ Freescale ]
