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MPC8349E PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10
Freescale Semiconductor
35
Local Bus
Output hold from local bus clock for LAD/LDP
t
LBKHOX2
1
—
ns
3
Local bus clock to output high impedance for LAD/LDP
t
LBKHOZ
—
3.8
ns
8
Notes:
1. The symbols for timing specifications follow the pattern of t
(first two letters of functional block)(signal)(state)(reference)(state)
for inputs
and t
(first two letters of functional block)(reference)(state)(signal)(state)
for outputs. For example, t
LBIXKH1
symbolizes local bus timing (LB)
for the input (I) to go invalid (X) with respect to the time the t
LBK
clock reference (K) goes high (H), in this case for clock one
(1). Also, t
LBKHOX
symbolizes local bus timing (LB) for the t
LBK
clock reference (K) to go high (H), with respect to the output
(O) going invalid (X) or output hold time.
2. All timings are in reference to the rising edge of LSYNC_IN.
3. All signals are measured from OV
DD
/2 of the rising edge of LSYNC_IN to 0.4
×
OV
DD
of the signal in question for 3.3 V
signaling levels.
4. Input timings are measured at the pin.
5. t
LBOTOT1
should be used when RCWH[LALE] is not set and when the load on the LALE output pin is at least 10 pF less than
the load on the LAD output pins.
6. t
LBOTOT2
should be used when RCWH[LALE] is set and when the load on the LALE output pin is at least 10 pF less than the
load on the LAD output pins.
7. t
LBOTOT3
should be used when RCWH[LALE] is set and when the load on the LALE output pin equals the load on the LAD
output pins.
8. For active/float timing measurements, the Hi-Z or off-state is defined to be when the total current delivered through the
component pin is less than or equal to that of the leakage current specification.
Table 35. Local Bus General Timing Parameters—DLL Bypass
9
Parameter
Symbol
1
Min
Max
Unit
Notes
Local bus cycle time
t
LBK
15
—
ns
2
Input setup to local bus clock
t
LBIVKH
7
—
ns
3, 4
Input hold from local bus clock
t
LBIXKH
1.0
—
ns
3, 4
LALE output fall to LAD output transition (LATCH hold time)
t
LBOTOT1
1.5
—
ns
5
LALE output fall to LAD output transition (LATCH hold time)
t
LBOTOT2
3
—
ns
6
LALE output fall to LAD output transition (LATCH hold time)
t
LBOTOT3
2.5
—
ns
7
Table 34. Local Bus General Timing Parameters—DLL On (continued)
Parameter
Symbol
1
Min
Max
Unit
Notes