MPC8314EEC datasheet(40/101 Pages) FREESCALE

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MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Local Bus

This figure provides the AC test load for the local bus.

Figure 23. Local Bus AC Test Load

Input hold from local bus clock

tLBIXKH

1.0

—

3, 4

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT1

1.5

—

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT2

3—

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT3

2.5

—

Local bus clock to output valid

tLBKHOV

—3

Local bus clock to output high impedance for LAD

tLBKHOZ

—4

LALE output rise to LCLK negative edge

tLALEHOV

—3.0

Note:

1. The symbols used for timing specifications herein 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 falling edge of LCLK0 (for all outputs and for LGTA and LUPWAIT inputs) or rising edge of

LCLK0 (for all other inputs).

3. All signals are measured from NVDD/2 of the rising/falling edge of LCLK0 to 0.4

 NVDD of the signal in question for 3.3-V

signaling levels.

4. Input timings are measured at the pin.

5. tLBOTOT1 should be used when RCWH[LALE] is not set and the load on LALE output pin is at least 10pF less than the load

on LAD output pins.

6. tLBOTOT2 should be used when RCWH[LALE] is set and the load on LALE output pin is at least 10pF less than the load on

LAD output pins.

7. tLBOTOT3 should be used when RCWH[LALE] is set and the load on LALE output pin equals to the load on 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 the leakage current specification.

Table 44. Local Bus General Timing Parameters (continued)

Parameter

Symbol 1

Min

Max

Unit

Note

Output

Z0 = 50 

NVDD/2

RL = 50 

MPC8314EEC Datasheet(PDF) 40 Page - Freescale Semiconductor, Inc

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