MPC8548ECPXATHC datasheet(47/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

Local Bus

LGTA/LUPWAIT input hold from local bus clock

tLBIXKL2

–1.3

—

4, 5

LALE output transition to LAD/LDP output transition (LATCH hold time)

tLBOTOT

1.5

—

Local bus clock to output valid (except LAD/LDP and LALE)

tLBKLOV1

—–0.3

—

Local bus clock to data valid for LAD/LDP

tLBKLOV2

—–0.1

Local bus clock to address valid for LAD

tLBKLOV3

—0

Local bus clock to LALE assertion

tLBKLOV4

—0

Output hold from local bus clock (except LAD/LDP and LALE)

tLBKLOX1

–3.7

—

Output hold from local bus clock for LAD/LDP

tLBKLOX2

–3.7

—

Local bus clock to output high Impedance (except LAD/LDP and LALE)

tLBKLOZ1

—0.2

Local bus clock to output high impedance for LAD/LDP

tLBKLOZ2

—0.2

Notes:

1. The symbols used 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, tLBIXKH1 symbolizes local bus

timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes high (H), in this case

for clock one (1). Also, tLBKHOX symbolizes local bus timing (LB) for the tLBK 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 local bus clock for PLL bypass mode. Timings may be negative with respect to the local bus

clock because the actual launch and capture of signals is done with the internal launch/capture clock, which precedes LCLK

by tLBKHKT.

3. Maximum possible clock skew between a clock LCLK[m] and a relative clock LCLK[n]. Skew measured between

complementary signals at BVDD/2.

4. All signals are measured from BVDD/2 of the rising edge of local bus clock for PLL bypass mode to 0.4  BVDD of the signal

in question for 3.3-V signaling levels.

5. Input timings are measured at the pin.

6. The value of tLBOTOT is the measurement of the minimum time between the negation of LALE and any change in LAD.

7. For purposes of 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 the leakage current specification.

8. Guaranteed by characterization.

9. Guaranteed by design.

Table 42. Local Bus Timing Parameters—PLL Bypassed (continued)

Parameter

Symbol1

Min

Max

Unit

Notes

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