Local Bus
Table 39 provides the DC electrical characteristics for the local bus interface operating at
BV = 2.5 V DC.
DD
Table 39. Local Bus DC Electrical Characteristics (2.5 V DC)
Parameter
Symbol
Min
Max
Unit
High-level input voltage
V
1.70
–0.3
—
BV + 0.3
V
V
IH
DD
Low-level input voltage
V
I
0.7
10
IL
1
Input current (V
= 0 V or V = BV
)
μA
IN
IN
DD
IH
I
–15
—
IL
High-level output voltage (BV = min, I = –1 mA)
V
OH
2.0
—
V
V
DD
OH
Low-level output voltage (BV = min, I = 1 mA)
V
OL
0.4
DD
OL
Note:
1. Note that the symbol V , in this case, represents the BV symbol referenced in Table 1 and Table 2.
IN
IN
10.2 Local Bus AC Electrical Specifications
Table 40 describes the timing parameters of the local bus interface at BV = 3.3 V. For information about
DD
the frequency range of local bus, see Section 19.1, “Clock Ranges.”
Table 40. Local Bus Timing Parameters (BV = 3.3 V)—PLL Enabled
DD
1
Parameter
Symbol
Min
Max
Unit
Notes
Local bus cycle time
Local bus duty cycle
t
7.5
43
—
12
57
150
—
ns
%
2
—
7, 8
3, 4
3, 4
3, 4
3, 4
6
LBK
t
t
LBKH/ LBK
LCLK[n] skew to LCLK[m] or LSYNC_OUT
t
ps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
LBKSKEW
Input setup to local bus clock (except LGTA/LUPWAIT)
LGTA/LUPWAIT input setup to local bus clock
t
t
t
t
1.8
1.7
1.0
1.0
1.5
—
LBIVKH1
LBIVKH2
LBIXKH1
LBIXKH2
—
Input hold from local bus clock (except LGTA/LUPWAIT)
LGTA/LUPWAIT input hold from local bus clock
LALE output transition to LAD/LDP output transition (LATCH hold time)
Local bus clock to output valid (except LAD/LDP and LALE)
Local bus clock to data valid for LAD/LDP
—
—
t
—
LBOTOT
t
2.0
2.2
2.3
2.3
—
—
3
LBKHOV1
LBKHOV2
LBKHOV3
LBKHOV4
LBKHOX1
t
t
t
t
—
Local bus clock to address valid for LAD
—
3
Local bus clock to LALE assertion
—
3
Output hold from local bus clock (except LAD/LDP and LALE)
Output hold from local bus clock for LAD/LDP
0.7
0.7
—
3
t
—
3
LBKHOX2
Local bus clock to output high Impedance (except LAD/LDP and LALE)
t
2.5
5
LBKHOZ1
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6
Freescale Semiconductor
42
FREESCALE [ Freescale ]
